Stemless shoulder prosthesis versus conventional anatomic shoulder prosthesis in patients with osteoarthritis

Background

The stemless shoulder prosthesis is a new concept in shoulder arthroplasty. To date, only a few studies have investigated the results of this prosthesis. The aim of this study was to investigate the clinical and radiological midterm results of this implant in comparison with a standard anatomic stemmed shoulder prosthesis.

Materials and methods

The Constant score, the DASH score, the active range of motion (abduction, anteversion, external rotation), and the radiological results were examined in 82 patients with primary osteoarthritis of the shoulder treated with either the Total Evolutive Shoulder System^® (Biomed, France) stemless shoulder prosthesis or the Affinis^® (Mathys, Switzerland) stemmed shoulder prosthesis to detect possible differences in the functional outcome and to evaluate radiological properties of the implants. Patients were examined before and 32 ± 4 months after surgery.

Results

There was no significant difference in the Constant scores of the groups treated with the stemless shoulder prosthesis (65.0 ± 11.0 points) and the stemmed shoulder prosthesis (73.2 ± 11.3 points; P = 0.162). The estimated blood loss (P = 0.026) and the mean operative time (P = 0.002) were significantly lower in the group with the stemless shoulder prosthesis.

Conclusions

The use of the stemless shoulder prosthesis yielded good results which, in a mid-term follow-up, were comparable with those provided by a standard anatomic shoulder prosthesis. Further investigations are needed regarding the long-term performance of this prosthesis.     

Intermediate to long term results of stemless metaphyseal reverse shoulder arthroplasty: A five to nine year follow-up

BackgroundShoulder arthroplasty incidence is increasing as is the volume of revision surgeries. Revision surgery is easier if humeral bone stock is preserved with minimal bone defects and osteolysis. This has led to an increased focus on the development of various short stemmed and stemless implants which provides stable fixation whilst preserving humeral bone stock.PurposeTo review the medium to long term clinical and radiological outcomes, complications and survival rates of a stemless reverse shoulder prosthesis.Patients and methodPatients with a minimum follow-up of 60 months following a reverse stemless shoulder arthroplasty were deemed eligible. Clinical and radiological data on twenty-one patients operated between 2009 and 2014 were recorded prospectively. Survivorship and patient recorded symptoms with the end point of revision surgery were recorded.ResultsMean follow-up of 78 months (60–114 months). Mean range of active elevation was 136° (80–170°). Mean range of active abduction and active external rotation was 122° (70–170°) and 47° (10–75°) respectively. Mean Oxford score improved from 12 pre-operatively to 44 at final follow up (p < 0.0001). Mean Constant Murley Score improved from 18 to 72 (p < 0.0001). Mean ADLEIR score of 13 pre-operatively increased to 32 post-operatively (p < 0.0001). Notching was seen in 23.5% of cases and no radiolucent areas were observed around the glenoid component. There were two cases of post traumatic peri-prosthetic fractures that were managed conservatively and one case of deep-seated infection that required a washout. The survivorship at the most recent follow-up was 100%.ConclusionThe advantages of bone preservation with the stemless metaphyseal prosthesis combined with encouraging medium to long term clinical and radiological results are very promising, particularly with the improved post-operative patient satisfaction scores. This is the first study that reports the results with a minimum of 5 year follow-up and has the longest mean follow-up period.Clinical relevanceThe reverse stemless shoulder prosthesis is an effective and reliable option for elective shoulder arthroplasty.     

Good clinical and radiologic outcomes with the SMR Stemless anatomic TSA after a minimum of 2 years’ followup

BackgroundThis study evaluated the clinical and radiologic mid-term outcomes of anatomic total shoulder arthroplasty for osteoarthritis using a new stemless system.MethodsBetween July 2015 and May 2018, 49 shoulders in 47 patients received an anatomic total shoulder arthroplasty for osteoarthritis with the SMR Stemless shoulder system. Forty patients could be included. A review was conducted at a minimum follow-up of 24 months. There were 18 male and 22 female patients. The average age at the time of surgery was 67 years. Clinical evaluation was conducted using the Oxford Shoulder Score (OSS), American Shoulder and Elbow Surgeons Standardized Shoulder Assessment Form (ASES), scoring patient satisfaction, and range of motion. Standardized radiographs were assessed for radiolucency, loosening, superior migration of the humeral head, and reduced bone density.ResultsThe mean clinical follow-up was 35 months (range, 24-54 months). The mean OSS was 46 points (range, 35-48) and the mean ASES score was 89 points (range, 52-100) at final follow-up. The rate of either “satisfied” or “very satisfied” patients was 97%. No radiolucency around the humeral implant or loosening was found. Radiolucent lines of 2 mm or less around the glenoid were detected in 3 shoulders. The overall complication rate was 7.5% and the rate of revision was 5%.ConclusionsPatients treated with the SMR Stemless Shoulder System for shoulder osteoarthritis achieved good clinical and radiologic results comparable with the midterm results of other stemless designs. The convertible design of the SMR Stemless simplifies future revision to reverse total shoulder arthroplasty.Level of evidenceLevel IV; Case Series; Treatment Study.     

Indikationsspezifische mittelfristige Ergebnisse der anatomischen Kurzschaft-Schulterprothese

Background

The stemless shoulder prosthesis is a new concept in shoulder arthroplasty. To date, only few studies have investigated the results of this prosthesis. The aim of this study was to investigate the clinical and radiological midterm results of this implant with respect to different indications.

Materials and Methods

The Constant Murley score (CMS), the disabilities of the arm, shoulder, and hand (DASH) score, active range of motion (abduction, anteversion, external rotation) and radiological results were examined in 86?patients (31?male/55?female, age 65.4?±?8.7?years) with the TESS? stemless shoulder prosthesis. The average follow-up time was 31?±?4?months.

Results

The overall mean CMS improved significant (p?<?0.001) from 36.2?±?9.5?points preoperatively to 66.0?±?14.4?points after surgery and, as suspected, shows significant differences between the various patient groups (CMS after surgery: primary omarthrosis 73.3?±?11.4?points, posttraumatic omarthrosis 56.6?±?12.8?points, humeral head necrosis 62.7?±?9.8?points, rheumatoid arthritis 50.2?±?11.0?points, rotator cuff tear arthropathy 44.7?±?3.7?points). Regarding pain relief, there were no significant differences within the patient groups. In contrast, the functional results were significantly better in patient with primary omarthrosis and humerus head necrosis as compared to the other indications.

Conclusions

Depending on the indication, the use of stemless shoulder prostheses leads to good results that are comparable to those of conventional anatomic shoulder prostheses at mid-term follow-up.     

Food and Drug Administration–reported complications of anatomic stemless total shoulder arthroplasty vary with implant model

BackgroundStemless shoulder arthroplasty not only allows for shorter operative time and less blood loss but also for placement of the humeral head independent of the diaphysis, thereby preserving bone that may be needed for further revisions. The purpose of this study was to evaluate the current adverse event profile for anatomic stemless shoulder arthroplasty using the Manufacturer and User Facility Device database.MethodsThe adverse event reports mandated by the US Food and Drug Administration for all hospitals housed in the Manufacturer and User Facility Device database were screened for mention of anatomic stemless total shoulder arthroplasty (TSA). Each applicable report was then characterized by implant design and failure mode.ResultsThe most commonly reported stemless implants were the Zimmer Biomet Sidus, Zimmer Biomet Nano, and Arthrex Eclipse. The most common complications were pain/stiffness (16.8%), glenoid component loosening (12%), glenoid component failure (11%), and problems with attachment onto the humeral insert (9.9%).ConclusionsBecause of the benefits of increased bone preservation with less operative time and decreased blood loss compared with anatomic stemmed TSA, stemless implants are becoming increasingly popular in clinical practice. There were no findings that discourage the use of stemless TSA in the right candidate.Level of evidenceLevel III; Database Case Series Treatment Study     

Clinical and radiological outcomes using the LIMA SMR stemless implant—A 2-year follow-up in 49 patients

BackgroundSince the introduction of stemless anatomic total shoulder arthroplasty (TSA), many studies have been published on this specific group of TSA implants. The following study aimed to evaluate clinical and radiological short- to mid-term outcomes of the LIMA SMR stemless anatomical implant.MethodsWe prospectively evaluated the outcome of 53 TSAs in 52 patients, with a mean age of 58.45 years (range 47-78 years) at the time of implantation with a minimum follow-up of 2 years (range 24-47 months). All patients were physically and radiologically examined; the results were documented by the Constant-Murley Score and the Simple Shoulder Value.ResultsSignificant improvements from preoperative to latest follow-up were documented in Constant-Murley Score (29.0-75.84 pts; P < .001), active range of motion (abduction 84.7°-133.2°, flexion 95.3°-146.4°, and external rotation 12.7°-32.4°). The mean Simple Shoulder Value was 82.15% at the last follow-up. There was no complete loosening of the humeral component, but a lowering of bone mineral density (radiolucencies, RLL) was observed in anteroposterior or axially views—radiographs at the humeral component in 10.2% of the cases, most of them on the anteroposterior view at the calcar region. There was no statistical difference in the outcome of the patients with RLL compared with the ones without radiolucencies. Major complications or revisions did not occur.ConclusionThis study provides comparable improvement in functional, radiographic, and subjective mid-term results with other stemless anatomic implants.     

Stemless and stemmed total shoulder arthroplasty: a comparison of short-term clinical and radiographic outcomes

BackgroundStemless total shoulder arthroplasty could provide benefits over stemmed arthroplasty which has represented the gold standard for decades. Proposed benefits of stemless arthroplasty include better reproduction of anatomy and reduction in stress shielding; however, this does not appear to be confirmed by any study. The hypothesis was there would be no clinical differences between the stemless and the short-stem prosthesis, but the stemless prosthesis would better reproduce coronal radiographic anatomy and have less radiographic evidence of stress shielding.Materials and MethodsA prospectively collected data of patients undergoing primary, anatomic total shoulder arthroplasty for osteoarthritis were retrospectively reviewed. Patient-determined outcomes including the Western Ontario Osteoarthritis Index, American Shoulder and Elbow Surgeons score, Single Assessment Numeric Evaluation, Simple Shoulder Test, and Shoulder Activity Level were recorded preoperatively, at 1 year, and at 2 years. Preoperative and 1-year postoperative range of motion was recorded. Radiographic parameters to assess restoration of proximal humeral anatomy included humeral head height, humeral neck angle, humeral centering on the glenoid, and postoperative restoration of the anatomic center of rotation. Final postoperative radiographs were assessed for evidence of stress shielding.ResultsForty-eight patients had a stemmed humeral prosthesis, and 109 patients had a stemless prosthesis. Patient-determined outcomes were available from 2 years postoperatively in 99.4%. Both groups had significant improvements in all patient-reported outcomes and range-of-motion metrics, but there were no differences between the stemless and stemmed groups in these outcomes. The prosthetic humeral head of the stemmed components was more likely to extend further superior to the humeral osseous margin than that of the stemless group (2.0 ± 2.4 vs. 0.8 ± 1.4 mm; P = .0004). The stemless group had a smaller postoperative deviation from the anatomic center of rotation than the stemmed group (2.5 ± 1.9 vs. 3.2 ± 2.1 mm; P = .04). The humeral neck angle was comparable between the stemmed group and the stemless group (133 ± 7° vs. 131 ± 8°; P = .06). There was similar mean deviation of humeral head centering on the glenoid prosthesis between the stemmed and stemless groups (1.9 ± 1.8 vs. 1.6 ± 1.7 mm; P = .20). There was evidence of stress shielding in 10 patients (21%) with a stemmed prosthesis and in no patients with a stemless prosthesis at 1-year follow-up (P < .0001).ConclusionsThere were no differences in patient-determined outcomes between the groups at 2-year follow-up. Restoration of proximal humeral anatomy was either better or equivalent with the stemless prosthesis compared to the stemmed one. Radiographic evidence of stress shielding was found in the stemmed prosthesis but not in the stemless prosthesis at 1-year follow-up.     

Reverse shoulder arthroplasty with a cementless short metaphyseal humeral prosthesis without a stem: survivorship,early to mid-term clinical and radiological outcomes in a prospective study from an independent centre

Introduction

The use of reverse total shoulder arthroplasty has increased for the management of cuff-deficient glenohumeral joint arthritis and fractures. With bone preservation being a major target in reverse shoulder arthroplasty, metaphyseal humeral components without a stem were developed. The aim of this study is to present the survivorship, functional and radiological outcomes of a novel short metaphyseal prosthesis without a diaphyseal stem from an independent centre.

Methods

Clinical function and radiological features of patients undergoing stemless reverse shoulder arthroplasty were prospectively recorded. Patients’ demographics, indications for surgery, complications, functional and radiological assessment at the final follow-up as well as survivorship with the end point of revision for any reason were recorded.

Results

Between 2009 and 2016, 36 patients received 37 reverse shoulder arthroplasties with the stemless Verso prosthesis. Mean age of the patients was 76.9 years. The most common indication for surgery was cuff tear arthropathy. Mean follow-up was 3 years (range 1–7 years). Oxford shoulder score improved from an average of 11 pre-operatively (range 2–19) to 44 post-operatively (range 29–48) (p < 0.0001). There was one case of a deep post-operative infection that needed washout, liner exchange with retention of the prosthesis. Radiographic analysis showed no lucencies, or stress shielding around the humeral or glenoid components. Constant score at the final follow-up was on average 63 (range 35–86). Activities of daily living with requirement for internal and external rotation score (ADLEIR) was on average 12 pre-operatively (range 0–27) and 31 post-operatively (range 18–36) (p < 0.0001). There was 100% survivorship of the prosthesis in this early to mid-term study.

Conclusion

This early to mid-term prospective study demonstrates excellent survivorship and radiological results of the Verso reverse shoulder replacement. It needs a simple reproducible technique, and the results have been replicated at an independent centre. This study underlines its survivorship in the early to mid-term and confirms lower incidence of complications such as instability, notching, loosening and the need for revision surgery. Most importantly, it conserves the humeral bone stock for revision arthroplasties in the future. Our results are similar to those of the currently published literature.

     

Clinical and radiological outcome of the Total Evolutive Shoulder System (TESS®) reverse shoulder arthroplasty: a prospective comparative non-randomised study

Purpose

The aims of this study were to assess the function and quality of life after the Total Evolutive Shoulder System (TESS) reverse shoulder arthroplasty (RSA), to evaluate the radiological stability of the stemless version and to address the effect of arm lengthening and scapular notching (SN) on the outcome.

Methods

This was a prospective comparative non-randomised study. A total of 37 consecutive patients (40 shoulders) underwent TESS RSA between October 2007 and January 2012; 16 were stemless and 26 were stemmed. At a mean follow-up of 39 months (15–66), we evaluated range of motion (ROM), pain and functional outcome with QuickDASH and quality of life with EQ-5D score. Radiologically, component positioning, signs of loosening, SN and arm length difference were documented.

Results

We found a significant improvement in functional outcome and reduction of pain in both stemmed and stemless groups. No humeral loosening was evident, but there were four glenoid loosenings. In 12 shoulders that developed SN, seven already had scapular bone impression (SBI) evident on initial post-operative radiographs. Glenoid overhang seemed to decrease the risk of SN. Arm lengthening was associated with better EQ-5D but did not influence ROM or functional outcome.

Conclusions

Reverse shoulder arthroplasty markedly improved shoulder function. SN is of concern in RSA, but proper positioning of the glenoid component may prevent its development.     

Stemless versus stemmed anatomic total shoulder arthroplasty: a meta-analysis of randomized clinical studies at short term follow-up

BackgroundStemless total shoulder arthroplasty (TSA) implants were developed to counteract many of the complications and challenges associated with the stemmed humeral component. The purpose of this study was to evaluate the clinical efficacy, radiographic outcomes, and incidence of major complications of stemless implants relative to stemmed implants in the context of anatomic TSA using pooled data from randomized clinical studies.MethodsEight databases were queried in October 2021 for randomized clinical studies directly comparing the outcomes between patients treated with stemless anatomic TSA, and conventional anatomic TSA with a stemmed humeral component. Clinical outcomes between groups were compared using a random effects model and a pooled weighted mean difference, a pooled standardized mean difference, or a pooled odds ratio.ResultsFive randomized clinical studies were identified with a total of 584 patients at final follow-up (range: 24.0-32.7 months) and an average age of 64.9 years (range: 62.1-69.0 years) at the time of surgery. There was no significant difference between the 2 groups for adjusted Constant–Murley Scores (P = .20), pooled patient reported functional outcomes (P = .41), forward flexion range of motion (P = .92), external rotation range of motion (P = .05), radiographic migration/subluxation of the humeral component (P = .52), infection risk (P = .89), odds of a revision surgery (P = .86), or odds of a subsequent reverse TSA (P = .68). For odds of a periprosthetic fracture (P = .07) and odds of developing radiolucency related to the humeral component (P = .06), there was a potential clinical benefit for the stemless component; however, this difference was not statistically significant for the current data set.ConclusionThis meta-analysis directly compared stemless and stemmed anatomic TSA implants and demonstrated no significant difference in the pooled results for any of the included clinical outcomes, radiographic outcomes, major complication outcomes, or revision surgery related outcomes between the 2 groups at early follow-up, although the small sample size may preclude in finding significance. These findings suggest that there are equivalent clinical outcomes of stemless anatomic TSA components and that these implants are safe, efficacious, and non-inferior relative to the current gold standard stemmed humeral implant. The data suggest that this is true for relatively younger anatomic TSA patients sampled from a population that is similar to those included in this meta-analysis.     

Shoulder arthroplasty in patients with ipsilateral hemiparesis: a safe and durable procedure? A case series

HypothesisShoulder arthroplasty is a safe and durable procedure that provides pain relief, improved range of motion (ROM), and minimal complications for shoulder pain and dysfunction in patients with ipsilateral hemiparesis.MethodsThis is a retrospective review of all adult patients who underwent primary reverse total shoulder arthroplasty (RSA) or total shoulder arthroplasty (TSA) in the hemiparetic upper extremity at a single quaternary care academic medical center from 1988 to 2019. Patients were excluded if their neurologic insult was secondary to a spinal-cord injury, cerebral palsy, or inflammatory arthritis, if they underwent a hemiarthroplasty, if they exhibited mild hemiparesis (Medical Research Council Scale of ≥4), or if they had less than 30 days of radiographic follow-up. The primary clinical outcome was revision surgery for any reason. The secondary clinical outcomes included pain using the visual analog scale, ROM via active-assisted manual muscle testing (AAROM), and postoperative complications. The primary radiographic outcome was implant lucency using a standard scale.ResultsA total of 5 shoulders in 5 patients were included, 4 RSAs and 1 TSA with a mean clinical follow-up of 6.2 years (range: 1.42-14.2 years) and mean radiographic follow-up of 3.7 years (range: 31 days-13.5 years). No patient underwent revision surgery. The mean visual analog scale score significantly improved from 7.6 to 1.4 at the last follow-up (P = .005). The mean forward elevation AAROM improved from 27° preoperatively to 88° at the last follow-up (P = .015). There was no significant difference in external rotation at the last follow-up (P = .105). One patient had asymptomatic grade 1 glenoid component lucency with superior subluxation of the humerus after undergoing TSA at a final follow-up of 4.5 years. No other complications were reported.ConclusionShoulder arthroplasty is a durable procedure that provides pain relief, improved AAROM, and minimal complications in patients with ipsilateral hemiparesis. The increase in active-assisted forward elevation ROM can improve caregiver ease with hygiene and dressing. Patients in this study who underwent RSA did not have subsequent glenohumeral dislocation. Larger numbers of patients would be required for adequate power analysis regarding instability in this cohort of patients who may be at risk; our small series did not identify any instability events.Level of evidenceLevel IV; Treatment Study     

非限制性人工肩关节置换治疗肩关节和肱骨近端严重病损

目的观察并评估非限制性人工肩关节置换治疗肩关节及肱骨近端严重病损的疗效。方法自1999～2004年共进行11例人工肩关节置换术,患者平均年龄为65岁；肱骨近端复杂四部分骨折6例,陈旧性肱骨解剖颈骨折并脱位3例,肩关节骨关节炎2例。其中对2例肩关节骨关节炎采用非限制性假体全肩关节置换术,对9例复杂肱骨近端骨折采用非限制性假体半肩置换术。所有11个肱骨头假体和2个肩盂假体均使用骨水泥固定。结果所有患者均获得随访,时间为1～4年,平均2．3年。2例复杂骨折患者存在肩关节外旋部分受限和轻度疼痛,其余病例均无疼痛,假体无松动。采用Neer评分和美国矫形外科学会评定标准,术后Neer评分平均为88．7分,评定为满意,肩关节功能满意。结论非限制性人工肩关节置换治疗肱骨近端严重病损疗效可靠、安全,精确的假体安置、软组织修复及术后系统的康复训练是关节功能恢复及降低并发症的关键。     

Minimum clinically important difference for the American Shoulder and Elbow Surgeons score after revision shoulder arthroplasty

BackgroundPatients undergoing revision total shoulder arthroplasty (TSA) typically achieve smaller improvements in outcome measurements than those undergoing primary TSA. The minimum clinically important difference (MCID) in the American Shoulder and Elbow Surgeons (ASES) questionnaire for primary shoulder arthroplasty ranges from 13.6 to 20.9, but the MCID for revision shoulder arthroplasty remains unclear. This study aims to define the MCID in ASES score for revision TSA and ascertain patient factors that affect achieving the MCID threshold.MethodsPatients were identified from an institutional shoulder arthroplasty database. Prospective data collected included demographic variables, prior shoulder surgeries, primary and revision implants, indication for revision, and pre- and postoperative ASES scores. All patients provided informed consent to participate. An anchor-based method was used with a binary answer choice. The MCID was calculated using the receiver-operator curve (ROC) method, and the sensitivity, specificity, and area under the curve were obtained from the ROC. MCID values were compared between groups using Student's t-test. Multivariate logistic regression modeling was used to determine significant predictors for reaching MCID. Significance was defined as P< .05.ResultsA total of 46 patients underwent revision TSA with minimum 2-year follow-up. The MCID using ROC method was 16.7 with 71% sensitivity and 62% specificity. There was a trend toward males being more likely to reach MCID after revision arthroplasty (P= .058). There were also trends toward increased forward flexion and abduction range of motion in patients who met MCID (P= .08, P= .07). Multivariate logistic regression modeling demonstrated male sex to be associated with achieving MCID (P= .03), while younger age and fewer prior shoulder surgeries demonstrated a trend to association with achieving MCID (P= .06, P= .10).ConclusionThe MCID for ASES score in patients undergoing revision shoulder arthroplasty is similar to previously reported MCID values for patients undergoing primary shoulder arthroplasty. Younger, male patients with fewer prior shoulder surgeries were more likely to achieve MCID after revision TSA.Level of EvidenceLevel III; Retrospective Comparative Treatment Study     

The influence of preoperative teres minor muscle fatty degeneration on active external rotation following reverse total shoulder arthroplasty

BackgroundReverse total shoulder arthroplasty (rTSA) improves shoulder elevation in patients treated for cuff tear arthropathy (CTA) or irreparable massive cuff tears. Patient satisfaction can be limited by reduced active external rotation (AER). Rotator cuff muscles that externally rotate the shoulder are infraspinatus and teres minor (TM).AimThe purpose of this study was to assess the correlation between preoperative TM fatty degeneration and postoperative AER after rTSA performed for CTA or irreparable cuff tears.MethodsConstant scores and active range of motion were consecutively collected for 109 shoulders in 97 patients (mean: 75.73 ± 8.94 years; 31 male, 66 female) over a 10-year period. AER was evaluated with the humerus in adduction (AER1) and in abduction. TM muscle atrophy was scored according to Goutallier's classification, assessed on preoperative computed tomography scans.ResultsMultivariate analysis showed that TM fatty infiltration was a predictor of AER1. AER1 decreased by 4.9 degrees preoperatively and by 6.4 degrees at the final follow-up, for each increment in Goutallier grade (P = .02). Postoperatively, AER evaluated with humerus in abduction improved significantly (P < .001), but did not correlate with TM Goutallier grade. At a mean follow-up of 38 months (range: 24 to 96), mean Constant score improved from 20.5 ± 11.1 to 68.4 ± 14.9 (P < .001), as did shoulder active range of motion in all planes including AER1 (P < .001).ConclusionThis is the first study to quantify the inverse correlation between AER and TM Goutallier grade, both preoperatively and after rTSA; this information guides prognosis for patients with TM degeneration undergoing rTSA. Further studies are necessary to have a better understanding and find reliable solutions.Level of evidenceLevel III; Case Series     

Results of shoulder resurfacing arthroplasty at medium-term follow-up

BackgroundThe main objective of this study was to evaluate the medium-term survival rate of Shoulder Resurfacing humeral Arthroplasties (SRA). The secondary objectives were to evaluate the clinical and radiological results and complications of this kind of arthroplasty.MethodsSixty-five patients (75 shoulders) with a mean age of 69.1 years underwent shoulder resurfacing arthroplasty (Copeland Humeral Resurfacing Head, then Aequalis Resurfacing Humeral Head) between 2003 and 2017. Radiographic factors were evaluated pre- and postoperatively on AP and lateral views and on a preoperative CT-scan. At the last follow-up, functional results were evaluated using the Constant score, Disability Arm Shoulder and Hand score (DASH), pain on numeric scale and active range-of-motion measurement.ResultsAt the mean follow-up of 7.5 years, we reviewed 52 shoulders (44 patients) with a survival rate of 85% for any revision and 87% regarding complications specific to SRA. Eight shoulders required surgical revision. Among the 36 shoulders (32 patients) seen in consultation, we obtained statistically significant improvement between preoperative and postoperative absolute Constant score, adjusted Constant score, active range of motion for antepulsion and abduction. The mean inclination angle of proximal humerus head after prothesis was + 4.2° varus, and the difference was statistically significant (P = .02) compared with the preoperative measurement. A higher rate of complications was found in the post-traumatic osteonecrosis patient group while a lower rate of complications was found in the osteoarthritis patient group.ConclusionThis confirms that SRA is a good surgical option for shoulder arthroplasty with good survival rates and functional results, especially for patients with primary osteoarthritis.Level of evidenceLevel IV; Case Series, Therapeutic Study     

Function after closed reduction from early unstable reverse shoulder arthroplasty

BackgroundOptimizing deltoid tension during reverse shoulder arthroplasty (RSA) remains a challenge for the shoulder surgeon. Ideal tension likely differs based on patient age, anatomy, size, preoperative diagnosis, and deltoid strength. Excess tension might overstuff the joint and limit range of motion. The aim of this study was to compare the function of patients with early postoperative instability (as a proxy for deltoid tension) and those without instability.MethodsA retrospective cohort study comparing two groups of patients with primary RSA operated on over a 5-year period by a single fellowship-trained shoulder and elbow surgeon using a combination of lateralized and medialized glenoid prosthesis with a 135-degree neck-shaft angle on the humeral side was conducted. The main exposure was shoulder dislocation that did not require revision arthroplasty compared with all other patients in the study period who underwent uneventful primary RSA. Chart review was performed for patient demographics, preoperative diagnosis, operative details, preoperative and postoperative range of motion and pain, reoperation, and instability events. The primary outcome was final clinic visit forward elevation. Outcomes included preoperative, postoperative, and difference in forward elevation and external rotation, as well as pain level.ResultsA total of 79 shoulders treated with primary RSA from 2015 to 2019 were identified. The average follow-up was 9 months (range, 3-47 months). Sixty-seven patients (72 shoulders) underwent uneventful primary RSA. Seven patients (7 shoulders) in the treatment cohort presented to a postoperative visit with complaint of shoulder dislocation that was able to be self-reduced and/or presented with a dislocated shoulder requiring closed reduction without sedation. At the final follow-up, average postoperative forward elevation was 121 ± 27 degrees in stable shoulders versus 145 ± 15 degrees in the unstable group (P = .003). No significant difference in external rotation was shown between stable and unstable RSA (39 ± 12 degrees and 36 ± 14 degrees, respectively). Overall average forward elevation and external rotation improved from 71 to 123 degrees and 19 to 39 degrees, respectively. More than 95% of patients (69/72 uneventful RSA and 6/7 unstable RSA) reported improvement in shoulder pain postoperatively.ConclusionIn the absence of other reasons for instability, early dislocation after RSA is a potential marker of relatively loose deltoid tension. In this study, patients with instability demonstrated higher forward elevation. Patients without instability are likely a mix of those with optimal and suboptimal deltoid tension.Level of evidenceLevel III, Retrospective Comparative Treatment Study     

Reverse shoulder arthroplasty. Part 1: Systematic review of clinical and functional outcomes

Many factors influence the outcomes of reverse shoulder arthroplasty (RSA). The purpose of this study was to compare the clinical and functional outcomes of RSA depending on the surgical approach, type of prosthesis, and indication for surgery through a comprehensive, systematic review.A literature search was conducted (1985 to June 2012) using PubMed, CINAHL, EBSCO–SPORTDiscus, and Cochrane Central Register of Controlled Trials. Levels I–IV evidence, in-vivo human studies (written in English with minimum of 2 years of follow-up and sample size of 10 patients) reporting clinical and/or functional outcomes after RSA were included. The outcomes were analyzed depending on the surgical approach, type of prosthesis (with medialized or lateralized center of rotation), or indication for surgery.A total of 35 studies were included involving 2049 patients (mean [SD] percentage of females, age, and follow-up of 71.6% [13.4], 71.5 years [3.7], and 43.1 months [18.8], respectively). Studies using deltopectoral approach with lateralized prostheses demonstrated greater improvement in external rotation compared with medialized prostheses with the same approach (mean 22.9° and 5°, respectively). In general, RSA for cuff tear arthropathy demonstrated higher improvements in Constant and American Shoulder and Elbow Society scores, and range of motion compared with revision of anatomic prosthesis, failed rotator cuff repair, and fracture sequelae.Lateralized prostheses provided more improvement in external rotation compared to medialized prostheses. Indications of RSA for cuff tear arthropathy demonstrated higher improvements in the outcomes compared with other indications. RSA demonstrated high patient''s satisfaction regardless of the type of prosthesis or indication for surgery.

Level of Evidence:

Level IV.     

反球型人工肩关节置换术治疗合并肩袖损伤的老年粉碎性肱骨近端骨折

目的:探讨采用反球型人工肩关节置换术治疗老年粉碎肱骨近端骨折的临床疗效。方法:自2017年1月至2017年12月治疗12例老年粉碎性肱骨近端骨折或骨折-脱位患者,根据术前MRI检查以及术中直视下检查确认肩袖损伤诊断,采用反球型人工肩关节假体置换手术治疗。其中男7例,女5例;年龄65～86岁;左侧受累5例,右侧受累7例。观察患者肩关节活动度及术后并发症情况,采用VAS评分评价疼痛缓解程度,并采用UCLA评分评价肩关节功能恢复情况。结果:12例患者术后获得随访,时间8～18个月。末次随访时患者肩关节活动度:前屈上举90°～150°,外旋为5°～30°,内旋平均为L_3水平(S_1水平～L_1水平)。VAS疼痛评分为0～6分,UCLA评分为18～32分,其中良5例,差7例。所有患者术后均无感染、假体松动、肩峰应力骨折、神经血管损伤等并发症发生。结论:合并肩袖损伤的老年粉碎肱骨近端骨折采用反球型人工肩关节置换术治疗,术后早期肩关节活动范围恢复良好,疼痛较轻,患者满意度高。     

Stemless shoulder prosthesis for treatment of proximal humeral malunion does not require tuberosity osteotomy

Purpose

When the proximal humeral anatomy is altered because of malunion, shoulder arthroplasty is a challenge for the orthopaedic surgeon, and tuberosity osteotomy should be avoided whenever possible. The purpose of this study was to investigate the clinical and radiological outcomes of anatomic stemless shoulder arthroplasty in cases of malunion. We hypothesized that a stemless prosthesis can be implanted without performing tuberosity osteotomy.

Methods

We conducted a continuous, single surgeon, retrospective case series study with a minimum follow-up of two years (mean of 44 months, range 24–80). The Constant-Murley score, active range of motion and X-rays were evaluated in 27 patients (mean age of 60 years, range 37–83) with proximal humeral malunion who were treated with a stemless anatomic shoulder prosthesis.

Results

In all patients, the prosthesis was implanted without the need for tuberosity osteotomy. The Constant score improved from 27 to 62 (p?≤?0.001), active anterior elevation from 81° to 129° (p?≤?0.001), and external rotation from 5° to 40° (p?≤?0.001). There was no evidence of radiological loosening.

Conclusions

Use of a stemless anatomic shoulder prosthesis avoids the need for tuberosity osteotomy and certain surgical difficulties, even in cases of severe tuberosity malunion, and leads to good functional outcomes in the short term.