髌股关节软骨退变程度对单髁置换术后效果的影响

目的探讨髌股关节软骨退变程度对内侧活动平台单髁置换术短期疗效的影响。 方法回顾性分析2017年1月至2018年12月在深圳市人民医院因前内侧骨关节炎行内侧活动平台单髁置换或全膝关节置换术的75例患者资料,依据术中探查髌股关节软骨退变情况分为无退变单髁组(无退变组)、内侧退变单髁组(内侧退变组)、内外退变单髁组(内外退变组)和内外退变全膝组(全膝组)。单因素方差分析对比4组患者术前术后牛津大学膝关节评分(OKS)、美国特种外科医院(HSS)评分、骨关节炎指数(WOMAC)评分,并记录终末随访时有无假体松动、脱位、力线改变等情况。 结果所有患者获得随访,随访时间平均(36±10)个月。4组患者术后OKS评分、HSS评分、WOMAC评分较术前均有改善(F＝18.555,P<0.001;F＝5.867,P＝0.001;F＝22.671,P<0.001);术前术后OKS、HSS、WOMAC评分差值,无退变组与内侧退变组之间差异均无统计学意义(均为P>0.05),内外退变组与无退变组、内侧退变组相比,功能改善程度稍差(均为P<0.05),内外退变组与全膝组之间OKS、HSS、WOMAC评分差值差异无统计学意义(均为P>0.05)。所有病例于末次随访时无假体松动、脱位、力线改变。 结论内侧髌股关节软骨退变对内侧活动平台单髁置换术后疗效影响不大,但面对外侧髌股关节软骨退变时则需慎重,此时选择单髁或是全膝,需个性化考虑。     

Valgus Subsidence of the Tibial Component Caused by Tibial Component Malpositioning in Cementless Oxford Mobile-Bearing Unicompartmental Knee Arthroplasty

BackgroundValgus subsidence (VS) of the tibial component is a rare complication of unicompartmental knee arthroplasty (UKA), and surgeons might consider revision surgery. The present study aimed to identify the factors related to VS of the tibial component after cementless Oxford mobile-bearing UKA.MethodsThe study included 120 patients who underwent Oxford mobile-bearing UKA using a cementless tibial component in our center between September 2015 and September 2016. Six showed VS of >2° after surgery. Patients were stratified into 2 groups according to the occurrence of VS of the tibial component (VS group, n = 6; no-subsidence group, n = 114). Postoperative radiographic evaluations were conducted to assess the varus/valgus alignment, rotation, and mediolateral position of the tibial and femoral components. The Oxford Knee Score (OKS) was assessed at 3, 6, and 12 months postoperatively. Positional parameters and sequential change in OKS were compared between the two groups using unpaired t-test (P < .05, statistically significant).ResultsAt 3 months postoperatively, an average VS of 3.4° in the VS group was observed, with a significant decrease in OKS. VS was associated with a significantly more medial position and external rotation of the tibial component. After 3 months, VS stopped, and the OKS gradually improved without revision surgery.ConclusionsVS might be caused by the malpositioning of the tibial component. VS of the tibial component after UKA appears to stop, with simultaneous pain relief, even without revision after 3 months postoperatively.     

Anterior Cruciate Ligament Deficiency is Not Always a Contraindication for Medial Unicompartmental Knee Arthroplasty: A Retrospective Study in Nondesigner’s Japanese Hospital

BackgroundAn intact anterior cruciate ligament (ACL) is thought to be prerequisite for successful unicompartmental knee arthroplasty (UKA), but recent studies reported successful midterm results of UKA in ACL-deficient (ACLD) knees. We hypothesized that ACLD is not always a contraindication for medial UKA when preoperative radiographs showed typical anteromedial knee patterns.MethodsFrom April 2012 to March 2016, 401 Oxford mobile-bearing UKAs in 282 patients were retrospectively identified from our database. Patients whose ACL was severely damaged, but preoperative X-rays showed typical anteromedial osteoarthritis patterns, were categorized into the ACLD group. From intraoperative data, those whose ACL was intact were categorized into the ACL functional (ACLF) group. There were 32 and 369 knees in the ACLD and ACLF groups, respectively, and mean follow-up periods were 66.1 and 63.8 months for the ACLD and ACLF groups, respectively. We compared the postoperative clinical outcome and component survivorship, with an endpoint of component revision, between ACLD groups and ACLF groups.ResultsIn both groups, the Oxford knee score, Knee Society score, Tegner activity score, and knee range of motion in extension were improved after surgery. The UKA component survival rate at five years was 100% in the ACLD group and 98.9% in the ACLF group. There were no significant differences between the groups.ConclusionMid-term clinical outcomes of Oxford mobile-bearing UKA in ACLD knees were similar to those in ACLF knees. ACL deficiency is not always a contraindication for medial unicompartmental knee arthroplasty in patients with typical anteromedial osteoarthritis radiographs.     

应用Oxford单髁置换术治疗年轻膝内侧单间室骨关节炎患者的早期疗效

目的探讨应用Oxford单髁置换术治疗55岁及以下膝内侧单间室骨关节炎患者的早期疗效。方法回顾性分析2014年1月至2016年12月在北京积水潭医院矫形骨科行Oxford活动平台单髁置换术治疗的47例(56膝)55岁及以下膝内侧单间室骨关节炎患者的病历资料。术前及末次随访记录患者的牛津大学膝关节评分(OKS)、视觉模拟评分(VAS)、膝关节活动度(ROM)及机械轴股骨胫骨角(mFTA),并分析患者术后并发症发生率及假体生存率。结果手术年龄为(52.77±2.28)岁。随访时间为(42.16±9.60)个月。ROM由术前的(114.02±5.75)°提高至术后的(120.35±8.63)°,差异有统计学意义(P<0.05)。VAS评分由术前的(6.14±0.86)分降低至术后的(1.18±1.38)分,差异有统计学意义(P<0.05)。mFTA角由术前的(7.14±2.66)°改善至术后的(4.10±2.39)°,差异有统计学意义(P<0.001),且无膝关节内翻过度矫正。OKS评分由术前的(20.04±3.88)分提高至术后的(42.07±4.58)分,差异有统计学意义(P<0.001),优良率为91.1%。5例患者术后残留持续疼痛。随访期间,未发生其他严重并发症,假体生存率为100%。结论Oxford单髁置换术可显著改善年轻膝内侧单间室骨关节炎患者的临床症状和膝关节功能,早期疗效满意。残留疼痛是Oxford单髁置换术后最常见的并发症。     

移动平台单髁置换术治疗膝关节内侧间室骨性关节炎

目的评估移动平台单髁置换术治疗膝关节内侧间室骨性关节炎的临床疗效。方法回顾性分析自2011-10—2013—01使用Oxford Phase Ⅲ移动平台单髁系统治疗膝关节内侧间室骨性关节炎47例（50膝）．观察术后下肢力线、膝关节活动度和并发症,采用Oxford及AKS评分对手术前后膝关节功能进行评估。结果47例均获得随访,平均随访13（6～21）个月。未发生假体周围感染、假体周围骨折、下肢深静脉血栓、医源性神经血管损伤。2例出现内衬脱位,行翻修术,无感染。术后测量下肢力线平均内翻1．2°。Oxford评分：术前平均（24．6±1．9）分,术后平均（41．3±3．5）分。AKS疼痛评分：术前平均（50．5±3．9）分,术后平均（86．9±4．9）分。AKS功能评分：术前平均（47．0±6．6）分,术后平均（86．4±9．4）分。术后Oxford、AKS评分较术前明显提高,差异均有统计学意义（P〈0．05）。术后无伸直受限,最大屈曲度平均（121．0±6．7）°。结论移动平台单髁置换术治疗膝关节内侧间室骨性关节炎短期效果良好,但中远期疗效需进一步随访。     

牛津人工单髁关节置换假体生存分析及并发症处理策略

目的通过分析牛津3期活动平台人工单髁关节置换假体生存率,探讨其中长期临床疗效以及相关并发症的处理原则和预防策略。 方法选择自2007年4月至2016年10月期间,济南军区总医院骨病科应用人工单髁关节置换手术患者共435例515膝,均系膝关节前内侧骨关节病,其中男150例,女285例;年龄45～83岁,平均(61±8)岁。身体质量指数19～36 kg/m^2,平均(24±3)kg/m²。记录手术前后膝关节活动度(ROM)变化,采用美国膝关节协会评分(KSS评分)与牛津大学膝关节评分(OKS评分)评估临床疗效,记录术后所有并发症发生情况;采用Kaplan-Meier生存分析方法评估患者的假体生存率,对术前及末次随访的ROM变化、KSS评分、OKS评分分别进行配对t检验,以P<0.05为差异有统计学意义。 结果435例515膝全部完成随访,平均(5.2±1.8)年。至末次随访时,KSS评分由术前平均(59±10),改善至术后平均(93±8)(t＝－2.586,P<0.05);OKS评分由术前平均(24±8),提高至术后平均(43±5)(t ＝－2.056,P <0.05);膝关节术前平均(111±5)°,术后ROM平均(127±8)°(t ＝－2.334,P <0.05)。所有患者人工单髁关节假体总生存率为92.2%。515膝单髁关节中共有15例(2.9%)并发症发生,其中聚乙烯活动半月板衬垫脱位6例(1.2%);迟发性深部感染1例(0.2%),经规范抗感染治疗无效后行二期全膝关节翻修术,术后正常恢复;3例出现股骨髁侧假体松动(0.6%,含1例同时衬垫脱位病例),其中2例进行单髁关节翻修,1例予以全膝关节翻修;2例患者出现关节囊反复无菌性积液(0.4%),予以关节抽液并物理治疗后恢复;2例术后出现关节内游离体(0.4%),行关节镜手术取出后绞索症状消失;1例术后膝关节不明原因疼痛(0.2%),保守治疗后恢复;1例术中前交叉韧带止点部分撕脱(0.2%),术中予以韧带线缝合固定,术后铰链支具固定41周后功能锻炼,膝关节功能恢复良好。 结论牛津3期活动平台人工单髁关节置换是治疗膝内侧骨关节病的最佳治疗方法,临床疗效可靠,相关并发症发生率低;正确的适应证选择及成熟的外科操作能够保证UKA获得良好效果,降低并发症发生率;并发症的治疗需仔细分析发生的原因和类型,给予适当的处理。     

A Comprehensive Evaluation of Lateral Unicompartmental Knee Arthroplasty Short to Mid-Term Survivorship,and the Effect of Patient and Implant Characteristics: An Analysis of Data From the Dutch Arthroplasty Register

BackgroundThe rarity of lateral unicompartmental knee arthroplasty (UKA) results in a lack of large cohort studies and understanding. The aim of this study is to comprehensively evaluate survivorship of lateral UKA with registry data and compare this to medial UKA.MethodsLateral (n = 537) and medial UKAs (n = 19,295) in 2007-2017 were selected from the Dutch Arthroplasty Register. Survival analyses were performed with revision for any reason as primary endpoint. Adjustments were made for patient and implant characteristics. Stratified analyses according to patient and implant characteristics were performed. Reasons and type of revision were grouped according to laterality and bearing design.ResultsThe 5-year revision rate was 12.9% for lateral UKA and 9.3% for medial UKA. Multivariable regression analyses showed no significant increased risk for revision for lateral UKA (hazard ratio 0.87, 95% confidence interval 0.66-1.15). Stratified analyses showed that the effect of patient characteristics on revision was comparable between lateral and medial UKA; however, the use of mobile-bearing design for lateral UKA was associated with increased revision rate. Progression of osteoarthritis was the main reason for revision on both sides accompanied by tibia component loosening for medial UKA. Reasons and type of revision varied depending on bearing design.ConclusionSimilar survivorship of lateral and medial UKA was reported. Specifically, there is a notable risk for revision when using mobile-bearing designs for lateral UKA. Failure modes and type of revision depends on laterality and bearing design. These findings emphasize that surgical challenges related to anatomy and kinematics of the lateral and medial knee compartment need to be considered.     

Titanium Niobium Nitride Mobile-Bearing Unicompartmental Knee Arthroplasty Results in Good to Excellent Clinical and Radiographic Outcomes in Metal Allergy Patients With Medial Knee Osteoarthritis

BackgroundThe main purpose of the present study was to analyze the clinical and radiological outcomes of patients with positive skin patch tests who underwent medial mobile-bearing titanium niobium nitride unicompartmental knee arthroplasty (UKA) during a mid-term follow-up.MethodsThirty-seven patients with positive skin patch tests were included in this prospective study. The clinical evaluation consisted of Oxford Knee Score and Knee Society Score (KSS) reports. Each patient was clinically evaluated the day before surgery (T₀) as well as at T₁ (11.9 ± 1.3 months) and during the final follow-up T₂ (67.2 ± 19.1 months). The positioning of the UKA was evaluated during the final follow-up using standardized radiographs (T₂: 67.2 ± 19.1 months).ResultsOxford and KSS ranged from a respective mean preoperative value of 23.0 ± 2.7 and 51.5 ± 5.0 to 42.1 ± 1.7 and 87.6 ± 2.2, respectively, at T₁ (P < .001) and to the final values of 45.0 ± 1.9 and 91.9 ± 3.4, respectively, at T₂ (P < .001 both vs T₁ and T₂). At T₂, the mean femoral angle was 7.0° ± 4.5°, mean tibial angle was 3.0° ± 2.1°, and mean tibial slope was 5.1° ± 3.2°. A significant difference was found between KSS and Oxford with ANOVA for repeated measures over time (P < .001). The Oxford and KSS scores showed significant improvements during each follow-up. No complications were found, and not a single patient required a revision surgery during the follow-up period.ConclusionThe hypoallergenic titanium niobium nitride mobile-bearing UKA showed comparable results to standard CoCr UKA regardless of the gender, age, BMI, and implant size of metal allergy patients with medial knee osteoarthritis. Careful patient selection processes and accurate medical histories played key roles in the choice of hypersensitivity-friendly implants.     

髌股关节软骨损伤对Oxford单髁置换术的疗效研究

目的探讨单髁置换术对膝前内侧骨关节炎合并髌股关节软骨损伤患者术后疗效的影响。方法选择自2016年3月至2018年8月期间,山西医科大学附属人民医院骨科关节微创病区完成的单髁置换病例67例,均因为膝前内侧骨关节炎就诊,所有病例均为单侧膝关节置换。其中男19例,女48例;年龄51~84岁,平均(64.67±8.37)岁;左膝41例,右膝26例;身体质量指数(body mass index,BMI)19.56~30.47kg/m 2,平均(25.27±2.56)kg/m 2;病程为0.5~20.0年,平均(5.08±4.83)年。术中通过Outerbridge分级记录观察到的髌股关节软骨损伤并进行分组,术后随访通过牛津膝关节评分(oxford knee score,OKS)、Lonner髌股关节评分评价术后疗效、髌股关节疼痛及功能改善情况,对术前及术后随访的评分分别进行统计学分析,以P<0.05为差异有统计学意义。结果所有患者均完成随访,随访时间12~25个月,平均(18.12±3.68)个月;OKS评分由术前平均(44.42±4.86)分降低至术后平均(21.46±4.64)分(P<0.01);Lonner疼痛评分由术前平均(29.91±2.48)分提高至术后平均(49.54±2.42)分(P<0.01);Lonner功能评分由术前平均(23.17±1.40)分提高至术后平均(38.89±1.41分)(P<0.01)。术中观察发现35膝(52%)合并内侧髌股关节软骨损伤病例,与无髌股关节软骨损伤病例(32膝)相比,术后髌股关节疼痛感及功能均得到改善,术后1、3、6、12个月OKS评分、Lonner疼痛与功能评分对比,差异均无统计学意义(P>0.05)。结论术中证实的内侧髌股关节软骨损伤并不影响Oxford单髁置换术短期疗效。单髁置换术可作为合并内侧髌股关节软骨损伤的膝前内侧骨关节炎患者的治疗方式。     

Satisfactory Outcomes of All-Poly Fixed Bearing Unicompartmental Knee Arthroplasty for Avascular Osteonecrosis Versus Osteoarthritis: A Comparative Study With 10 to 22 Years of Follow-up

BackgroundWhile good mid-term results for treating spontaneous knee osteonecrosis (SPONK) with unicompartmental knee arthroplasty (UKA) have been reported, concerns remain about implant survival at long-term. This study aimed to compare outcomes and survivorship of UKA for SPONK vs osteoarthritis at a minimum of 10 years.MethodsThis case-control study included medial UKA for femoral SPONK operated between 1996 and 2010 with a minimum 10-year follow-up (n = 47). Each case was matched with a medial UKA for osteoarthritis based on body mass index (BMI), gender, and age. Knee Society Score (KSS), complications and radiological (loosening) data were collected at the last follow-up. Kaplan-Meier survivorship analysis was performed using revision implant removal as endpoint.ResultsThe mean follow-up was 13.2 years (range 10 to 21 years). Mean age and BMI were 72.9 ± 8.4 years and 25.5 ± 3.6 Kg/m² in SPONK group. At last follow-up, knee and function KSS were 89.5 ± 12 and 79 ± 18 in SPONK group vs 90 ± 15 (P = .85) and 81.7 ± 17 (P = .47) in control group. Complications and radiological results showed no significant differences. The survival rate free from any revision was 85.1% at last follow-up in SPONK group and 93.6% in control group (P = .23). The leading cause for revision was aseptic tibial loosening (57.1%) in SPONK group. The 15-year survival estimate was 83% in SPONK group.ConclusionSatisfactory clinical outcomes at long-term after UKA for femoral SPONK were observed, similar to those after UKA for osteoarthritis, despite a higher risk of tibial loosening in the SPONK group. No symptomatic femoral loosening leading to a revision was observed.Level of EvidenceIV.     

Preoperative lateral subluxation of the patella is a predictor of poor early outcome of Oxford phase-III medial unicompartmental knee arthroplasty

Background and purpose There is disagreement in the literature about the importance of patellofemoral joint degeneration and knee pain for the outcome of unicompartmental knee arthroplasty (UKA). We therefore investigated the importance of selected predictors including patellofemoral joint degeneration and the location of preoperative knee pain for the early outcome of UKA.

Patients and methods The study group comprised 260 consecutive patients from 5 hospitals who underwent Oxford UKA for anteromedial osteoarthritis. Data were collected at baseline and included pain location, radiologically observed degeneration of the patellofemoral joint including subluxation of the patella, intraoperative cartilage status of the patellofemoral joint, disease-specific knee status, and Oxford knee score (OKS). Outcomes were evaluated after 1 year using the OKS, global patient satisfaction, and global patient result.

Results The average OKS score at baseline was 24 (SD 7), and it was 40 (SD 8) at the 1-year follow-up. 94% of the patients claimed improvement after the operation and 90% were satisfied with the UKA. Lateral subluxation of the patella was a predictor of poor outcome, and the preoperative OKS score was also a predictor of outcome. Full-thickness cartilage loss at any location gave a similar outcome to that with a normal or near-normal joint surface, and likewise, preoperative anterior knee pain was not a predictor of outcome.

Interpretation We conclude that the good early outcome after UKA in this study is in line with the best reported results. Patellofemoral degeneration should not be considered a contraindication to Oxford UKA. Patients with lateral subluxation of the patella have an increased risk of a poor result after UKA and should preferably be offered a total knee replacement.     

胫骨高位截骨术与单髁置换术治疗膝内侧间室骨关节炎的疗效

目的探讨胫骨高位截骨术(HTO)与单髁置换术(UKA)治疗膝内侧间室骨关节炎的疗效。方法将60例膝内侧间室骨关节炎患者按治疗方法的不同分为HTO组和UKA组,每组30例。比较术中出血量、手术时间、术后引流量、并发症发生情况。记录两组术前及末次随访时疼痛VAS评分、Tegner膝关节运动评分、HSS评分。结果患者均获得随访,时间11~33(18.53±6.74)个月。术中出血量、术后引流量、手术时间HTO组均明显多(长)于UKA组(P<0.05)。两组VAS评分、Tegner膝关节运动评分、HSS评分末次随访时均明显优于术前(P<0.05);两组间各项指标比较差异均无统计学意义(P>0.05)。两组均未发生软组织感染、骨折、深静脉血栓等并发症。末次随访时,两组膝内侧间隙疼痛均明显缓解,患膝功能改善明显;HTO组内翻畸形及力线矫正明显;UKA组内翻畸形得到部分矫正。结论HTO与UKA治疗膝内侧间室骨关节炎均具有创伤小、患者恢复快、短期疗效好的优点。     

15-Year Follow-Up of Mobile Bearing Medial Unicompartmental Knee Arthroplasty

IntroductionMedial unicompartmental knee arthroplasty (UKA) is a successful treatment for antero-medial osteoarthritis. However, there are few published studies on the long-term survival of this procedure. The purpose of this study was to review the 15-year minimum outcomes and survival of a mobile-bearing medial UKA.MethodsA retrospective review was performed between July 2004 and December 2006 of all patients who underwent a medial UKA eligible for a minimum of 15-year follow-up. The initial query revealed 299 patients (349 knees). One hundred-seventeen patients died or were lost to follow-up, leaving 182 patients (219 knees) for analyses. Clinical outcomes and survivorship were analyzed.ResultsThere were 59 implant-related reoperations which occurred at a mean of 10 years (range, 0 to 16 years). The most common reasons for reoperation were arthritic progression (9.1%) and aseptic loosening (9.1%). The 10-year survival with revision to TKA was 89% (95% confidence interval: 86% to 92.4%), and the 15-year survival was 84.1% (95% confidence interval: 80.3% to 88%). There were no statistically significant differences in survival between sex, body mass index, and age. Patients who were not revised had statistically significant improvements in knee range of motion and Knee Society scores.ConclusionsThis study found similar long-term survival of a medial mobile-bearing UKA to published total knee arthroplasty outcomes. The implant evaluated in this study has undergone subsequent improvements in instrumentation and design. Further analyses should be performed on the long-term outcomes of the current implant platform.     

固定平台单髁置换术治疗膝关节前内侧骨关节炎的早期临床疗效

目的 探讨微创小切口固定平台单髁置换术治疗膝关节前内侧骨关节炎的早期临床疗效.方法 回顾性分析2018年5月至2019年10月在我科行小切口固定平台内侧单髁置换术的40例病人(43膝)的临床资料,其中男19例(20膝),女21例(23膝),年龄为(63.3±5.23)岁(53～79岁).记录并分析病人手术时间、出血量、...     

Age and Outcomes of Medial Meniscal-Bearing Unicompartmental Knee Arthroplasty

Background

National joint registries report increasing revision rates with decreasing patient age for all types of joint arthroplasty. This study aimed to explore the effect of age on function and revision risk in patients undergoing medial meniscal-bearing UKA.

Does Unicompartmental Knee Replacement Offer Improved Clinical Advantages Over Total Knee Replacement in the Treatment of Isolated Lateral Osteoarthritis? A Matched Cohort Analysis From an Independent Center

BackgroundThe purpose of this study is to compare the functional and radiographic results, perioperative complications, satisfaction rate, and mid-term survivorship after unicompartmental knee arthroplasty (UKA) and total knee arthroplasty (TKA) for the treatment of lateral compartmental knee osteoarthritis (LCKO).MethodsBetween March 2007 and September 2017, we identified 35 patients with primary TKAs and 121 patients with lateral UKAs (LUKAs) for LCKO with a minimum follow-up of 2 years (mean 5.3 years, range 2-12.4). The matched variables were age, gender, operation side, body mass index, American Society of Anesthesiologist grade, initial diagnosis, osteoarthritis grade in lateral compartment, and follow-up time. All patients were assessed using the Oxford Knee Score, Hospital for Special Surgery score, range of motion, length of hospital stay, satisfaction, and complications. Survivorship of UKA and TKA implants was also compared.ResultsAt last follow-up, LUKA had a significantly better postoperative Oxford Knee Score, Hospital for Special Surgery score, range of motion, shorter length of hospital time, and higher satisfaction rate than matched TKA group. There were significant differences regarding patellar tendon injury (P = .043), superficial wound infection (P = .028), patellar snapping or impingement (P = .047), and stiffness (P < .001). Five-year survivorships free from revision were similar in both groups (99.2% vs 97.1%, P = .347).ConclusionLUKA for LCKO demonstrated more favorable 5-year results in comparison with TKA. Furthermore, LUKA achieved comparable mid-term survivorship and was less likely to suffer from wound infection and knee stiffness, although not overall surgical complications.     

No Difference Unicompartmental Knee Arthroplasty for Medial Knee Osteoarthritis With or Without Anterior Cruciate Ligament Deficiency: A Systematic Review and Meta-analysis

BackgroundA functional intact anterior cruciate ligament (ACLI) is considered to be a prerequisite for unicompartmental knee arthroplasty (UKA). However, UKA has been shown to have good clinical efficacy in ACL-deficient (ACLD) knees at 3 to 10 years follow-up. Therefore, the role of ACLD in UKA remains controversial, and more evidence is needed to clarify the role of ACLD in UKA.MethodsPubMed, the Web of Science, EMBASE, and Cochrane Central were queried for articles comparing the results of the ACLD and ACLI groups after UKA. Outcomes of interest included the Tegner Activity Scale, the Oxford Knee Score (OKS), postoperative slope of the implant (PSI), the Knee Injury and Osteoarthritis Outcomes Score (KOOS), the Lysholm score, and revision rate. There were eight studies included. The mean age was 66 years (range 49 to 87 year old) and the mean follow-up time was 6.9 years (range 1.3 to 16.6 years). There was baseline comparability regarding mean age, duration of follow-up, and body mass index (P > .5) between the ACLD and ACLI groups.ResultsThe ACLD and ACLI groups had improved postoperative functional indicators, and that postoperative revision rate (mean difference [MD], 1.24; 95% confidence interval [CI], 0.75 to 2.04; P = .4), Tegner score (MD, ?0.1; 95% CI, ?0.26 to 0.05; P = .19), and Lysholm score (95% CI, ?2.46 to 7.32; P = .33) were similar between the groups, with no significant differences; however, the ACLD groups had significantly better KOOS Activities of Daily Living scores, with a significant difference (MD, 4.53; 95% CI, 1.75 to 7.3; P = .001). Also, there were no significant differences between two groups in the PSI, OKS, KOOS.ConclusionACL deficiency is not always a contraindication for UKA. With correct patient selection, UKA could be considered for medial knee osteoarthritis with ACL deficiency without antero-posterior instability, especially these people over 60 years of age.     

Impact of Polyethylene Thickness on Clinical Outcomes and Survivorship in Medial Mobile-Bearing Unicondylar Knee Arthroplasty

BackgroundThe thickness of the polyethylene bearing in medial unicondylar knee arthroplasty (UKA) is determined by the depth of the tibial resection, degree of correctable deformity, and balance of the knee. The purpose of this study is to evaluate whether polyethylene thickness in medial mobile-bearing UKA impacts clinical outcomes and survivorship.MethodsA retrospective review from 2004 to 2017 identified patients who underwent a primary mobile-bearing medial UKA with 2-year minimum follow-up or revision. A total of 2305 patients (3030 knees) met inclusion criteria. Patients were divided in 2 groups: thin bearing (group 1): 3-mm or 4-mm bearing and thick bearing (group 2): ≥ 5 mm. The thin group consisted of 2640 knees (87%), whereas the thick group had 390 knees (13%). Preoperative and postoperative demographics, range of motion, Knee Society scores, complications, and reoperations were evaluated.ResultsMean follow-up was 5.2 years (range, 0.5 to 12.6). There was no significant difference between groups in postoperative range of motion or Knee Society scores (P > .05). Manipulations were performed in 1.3% of patients and not significantly different between groups. The all-cause revision rate for group 1 was 4.02% and group 2 was 4.58% (P = .6). Revision rates for tibial aseptic loosening were significantly higher in group 2 (1.8%) than those in group 1 (0.7%) (P = .04). There was no significant difference in failure rates between groups for tibial collapse or fracture, femoral aseptic loosening, arthritic progression, bearing dislocation, or other cause of revision.ConclusionThis study demonstrated that thicker bearings in medial UKA increased the risk of tibial aseptic loosening, but not all-cause failures or clinical outcomes.     

生物型与水泥型单髁置换术治疗膝关节病的Meta分析

目的比较生物型与水泥型人工膝关节单髁置换术治疗内侧间室膝骨关节病的临床疗效。 方法检索Pubmed、荷兰医学文摘数据库(Embase)、循证医学数据库(Cochrane Library)、Web of science、中国期刊全文数据库(CNKI)和万方数据库2000年1月至2019年10月所有关于生物型与水泥型人工膝关节单髁置换术治疗内侧间室膝关节病的临床随机对照研究(RCT)和非随机对照研究(CCT)。排除重复文献,低质量文献,观察指标不符文献以及无法获得全文的文献。采用Cochrane风险评估工具及纽卡斯尔-渥太华量表(NOS)对纳入研究的文献进行质量评价。使用Revman 5.3进行Meta分析,比较两种固定方式在假体周围透亮线,5年假体生存率,牛津大学膝关节评分(OKS),并发症,手术时间等方面的差异。 结果共纳入文献9篇,累计病例18 702例,其中生物组8 735例,水泥组9 967例。Meta分析结果显示：生物型单髁组与水泥型单髁组比较,生物型单髁组假体周围完全透亮线的发生率更低[比值比(OR)＝0.08,95%置信区间(CI)(0.01,0.42),P＝0.003],膝关节OKS功能评分更高[均数差(MD)＝2.08,95%CI(0.51,3.65),P＝0.009],5年假体生存率更高[OR＝1.39,95% CI(1.20,1.60),P<0.0001],手术时间更短[MD＝-9.23,95% CI(-13.72,-4.74),P<0.0001],在并发症的发生率方面,两组间差异无统计学意义[OR＝0.43,95% CI(0.17,1.09),P＝0.07]。 结论与水泥型单髁相比,生物型单髁可以降低假体周围完全透亮线的发生率,提高膝关节功能及5年假体生存率,缩短手术时间,且不会增加并发症的发生,在临床值得推广应用。     

Erfahrungen mit medialen monokondylären Prothesen mit mobilem Plateau

Background

Unicompartmental knee arthroplasty (UKA) has become an accepted therapy for medial osteoarthritis. The main reasons for its popularity are the minimally invasive surgical technique and the reports of excellent long-term results including high patient satisfaction and good knee joint function especially in younger patients.

Objectives

The purpose of our retrospective study was to evaluate the physical activities of patients who had undergone an Oxford III medial UKA. Special attention was paid to implant positioning and osteoarthritis of the patellofemoral joint.

Materials and methods

Of 181 implanted Oxford III prosthesis, 136 (75.1%) could be followed up. The mean age at time of surgery was 65.2 years; the average time of follow-up was 4.2 years. In addition to a physical examination and x-ray, the following scores were obtained: WOMAC (Western Ontario and McMaster Osteoarthritis Index), OKS (Oxford Knee Score), KSS (Knee Society Score), UCLA activity and the Turba score.

Results

The majority of the patients (81%) returned to their sporting activity following knee surgery. Higher complication rates or progression of osteoarthritis associated with sporting activities were not observed. The active patients had significantly higher scores for the OKS, KSS, WOMAC, and UCLA scores. The correct implant position, especially avoiding overcorrection to valgus malalignment, is important for good clinical outcome.

Conclusion

Our results demonstrate that a high degree of patient satisfaction in terms of physical and sporting activity can be achieved using the Oxford III UKA for medial osteoarthritis without an increased risk for complications.