Fellow or foe: the impact of fellowship training programs on the education of Canadian urology residents

Objective

Throughout North America, increasing emphasis is being placed on surgical fellowships. Surgical educators and trainees have raised concerns that the escalating focus on fellowships may threaten the educational mission of more novice trainees. Our objective was to collect opinions from multiple perspectives (faculty, fellows and residents) regarding fellowship structure, fellow selection and the impact of clinical fellowships on urology resident training.

Methods

We anonymously surveyed 52 members of a major academic urology training program (University of Toronto) with established fellowship training programs for their opinions regarding fellowship structure, fellow selection, and the impact on resident training and education.

Results

The overall response rate was 88%. We identified significant differences of opinion among faculty, fellows and residents regarding fellowship structure, fellow selection and the impact on resident education. Specifically, faculty and fellows supported the addition of more fellows, felt that certain complex cases should be designated as “fellow cases” and that residents'' research opportunities were not restricted. Residents felt that fellows “steal” operative cases, that performing operations with the fellow is not equivalent to performing operations with faculty alone and that fellowship candidates should perform an operation with division faculty as part of the application process. There was agreement that fellowship programs add value to residents'' overall education, that fellows should participate in the call schedule and that fellows'' role in the operating room needs to be better defined with respect to case volume and selection. Proficiency in technical skills, clinical knowledge, teaching and teamwork were cited as the most attractive characteristics of an effective clinical fellow.

Conclusion

Residency and fellowship program directors must clearly define the role of the fellow and outline the limits of surgical practice, establish clear and consistent guidelines outlining responsibilities (operative, clinical and on-call), and open lines of communication to ensure that all opinions are recognized and addressed. Finally, they must select fellows with proficient technical skills, clinical knowledge, teaching ability and work ethic to ensure that they focus on “specialized” training.     

Learning to teach: A novel method for assessing surgical trainees’ teaching and operative knowledge

BackgroundThe purpose of this study was to investigate the feasibility of a simulated teaching activity as an assessment of surgical knowledge and teaching competencies.MethodsIn this prospective observational study, 15 residents and 1 fellow in the Department of Surgery watched three video clips of laparoscopic cholecystectomies and provided feedback to a participant learner. Qualitative and statistical analysis identified differences in surgical knowledge and teaching strategies.ResultsAs compared to senior trainees, junior trainees were more likely to speculate on the learner’s actions (p = 0.033), identify which actions looked correct (p = 0.028), and speculate more on the learner’s thoughts (p = 0.02). Senior trainees noted case difficulty more frequently (p = 0.028), identified more actions that looked incorrect (p = 0.004), and speculated more about the learner’s emotions (p = 0.033).ConclusionsA simulated teaching scenario successfully assessed operative and teaching competencies, suggesting a novel assessment method.     

How Do Areas of Work Life Drive Burnout in Orthopaedic Attending Surgeons,Fellows, and Residents?

BackgroundConcerning levels of burnout have been reported among orthopaedic surgeons and residents. Defined as emotional exhaustion and depersonalization, physician burnout is associated with decreased productivity, increased medical errors, and increased risk of suicidal ideation. At the center of burnout research, person-centered approaches focusing on individual characteristics and coping strategies have largely been ineffective in solving this critical issue. They have failed to capture and address important institutional and organizational factors contributing to physician burnout. Similarly, little is known about the relationship between burnout and the working environments in which orthopaedic physicians practice, and on how orthopaedic surgeons at different career stages experience and perceive factors relevant to burnout.Questions/purposes(1) How does burnout differ among orthopaedic attending surgeons, fellows, and residents? (2) What specific areas of work life are problematic at each of these career stages? (3) What specific areas of work life correlate most strongly with burnout at each of these career stages?MethodsTwo hundred orthopaedic surgeons (residents, fellows, and attending physicians) at a single institution were invited to complete an electronic survey. Seventy-four percent (148 of 200) of them responded; specifically, 43 of 46 residents evenly distributed among training years, 18 of 36 fellows, and 87 of 118 attending physicians. Eighty-three percent (123 of 148) were men and 17% (25 of 148) were women. Two validated questionnaires were used. The Maslach Burnout Inventory was used to assess burnout, measuring emotional exhaustion and depersonalization. The Areas of Worklife Survey was used to measure congruency between participants and their work environment in six domains: workload, control, reward, community, fairness, and values. Participants were invited to openly share their experiences and suggest ways to improve burnout and specific work life domains. The main outcome measures were Maslach Burnout Inventory subdomains of emotional exhaustion and depersonalization, and Areas of Worklife Survey subdomains of workload, control, reward, community, fairness and values. We compared outcome measures of burnout and work life between groups. Simple linear regression models were used to report correlations between subscales. Stratified analyses were used to identify which group demonstrated higher correlations. All open comments were analyzed and coded to fully understand which areas of work life were problematic and how they were perceived in our population.ResultsNine percent (7 of 80) of attending surgeons, 6% (1 of 16) of fellows, and 34% (14 of 41) of residents reported high levels of depersonalization on the Maslach Burnout Inventory (p < 0.001). Mean depersonalization scores were higher (worse) in residents followed by attending surgeons, then fellows (10 ± 6, 5 ± 5, 4 ± 4 respectively; p < 0.001). Sixteen percent (13 of 80) of attending surgeons, 31% (5 of 16) of fellows, and 34% (14 of 41) of residents reported high levels of emotional exhaustion (p = 0.07). Mean emotional exhaustion scores were highest (worse) in residents followed by attending surgeons then fellows (21 ± 12, 17 ± 10, 16 ± 14 respectively; p = 0.11). Workload was the most problematic work life area across all stages of orthopaedic career. Scores in the Areas of Worklife Survey were the lowest (worse) in the workload domain for all subgroups: residents (2.6 ± 0.4), fellows (3.0 ± 0.6), and attending surgeons (2.8 ± 0.7); p = 0.08. Five problematic work life categories were found through open comment analysis: workload, resources, interactions, environment, and self-care. Workload was similarly the most concerning to participants. Specific workload issues identified included administrative load (limited job control, excessive tasks and expectations), technology (electronic medical platform, email overload), workflow (operating room time, patient load distribution), and conflicts between personal, clinical, and academic roles. Overall, worsening emotional exhaustion and depersonalization were most strongly associated with increasing workload (r = - 0.50; p < 0.001; and r = - 0.32; p < 0.001, respectively) and decreasing job control (r = - 0.50; p < 0.001, and r = - 0.41; p < 0.001, respectively). Specifically, in residents, worsening emotional exhaustion and depersonalization most strongly correlated with increasing workload (r = - 0.65; p < 0.001; and r = - 0.53; p < 0.001, respectively) and decreasing job control (r = - 0.49; p = 0.001; and r = - 0.51; p = 0.001, respectively). In attending surgeons, worsening emotional exhaustion was most strongly correlated with increasing workload (r = - 0.50; p < 0.001), and decreasing job control (r = - 0.44; p < 0.001). Among attending surgeons, worsening depersonalization was only correlated with increasing workload (r = - 0.23; p = 0.04). Among orthopaedic fellows, worsening emotional exhaustion and depersonalization were most strongly correlated with decreasing sense of fairness (r = - 0.76; p = 0.001; and r = - 0.87; p < 0.001, respectively), and poorer sense of community (r = - 0.72; p = 0.002; and r = - 0.65; p = 0.01, respectively).ConclusionsWe found higher levels of burnout among orthopaedic residents compared to attending surgeons and fellows. We detected strong distinct correlations between emotional exhaustion, depersonalization, and areas of work life across stages of orthopaedic career. Burnout was most strongly associated with workload and job control in orthopaedic residents and attending surgeons and with fairness and community in orthopaedic fellows.Clinical RelevanceInstitutions wishing to better understand burnout may use this approach to identify specific work life drivers of burnout, and determine possible interventions targeted to orthopaedic surgeons at each stage of career. Based on our institutional experience, leadership should investigate strategies to decrease workload by increasing administrative support and improving workflow; improve sense of autonomy by consulting physicians in decision-making; and seek to improve the sense of control in residents and sense of community in fellows.     

Chondrosarcoma of the Temporomandibular Joint: Systematic Review and Survival Analysis of Cases Reported to Date

The purpose of this systematic review was to summarize the available data on TMJ chondrosarcomas and to perform a survival analysis of cases reported to date. This review was conducted in accordance with the PRISMA. Two authors performed an electronic search of case reports of TMJ chondrosarcoma published until August 02, 2020. Forty-seven studies reporting 53 cases were included. Chondrosarcomas of the TMJ were more prevalent in women, with a male:female ratio of 1:1.4. Survival curves were significantly associated with histological diagnosis (p = 0.004), reconstructive surgery (p = 0.024), recurrence (p < 0.001), and distant metastasis (p = 0.001). Only distant metastasis was independently associated with survival (p = 0.017). TMJ chondrosarcomas presented with low recurrence and higher survival rates than other chondrosarcomas. Synovial subtype, absence of reconstructive surgery, and presence of local recurrence or distant metastasis were associated with poorer prognosis.Supplementary InformationThe online version contains supplementary material available at 10.1007/s12105-021-01313-9.     

Defining the Tipping Point in Surgical Performance for Laparoscopic Donor Nephrectomy Among Transplant Surgery Fellows: A Risk‐Adjusted Cumulative Summation Learning Curve Analysis

The United Network for Organ Sharing recommends that fellowship‐trained surgeons participate in 15 laparoscopic donor nephrectomy (LDN) procedures to be considered proficient. The American Society of Transplant Surgeons (ASTS) mandates 12 LDNs during an abdominal transplant surgery fellowship. We performed a retrospective intraoperative case analysis to create a risk‐adjusted cumulative summation (RACUSUM) model to assess the learning curve of novice transplant surgery fellows (TSFs). Between January 2000 and December 2014, 30 novice TSFs participated in the organ procurement rotation of our ASTS‐approved abdominal transplant surgery fellowship. Measures of surgical performance included intraoperative time, estimated blood loss, and incidence of intraoperative complications. The performance of senior TSFs was used to benchmark novice TSF performance. Scores were tabulated in a learning curve model, adjusting for case complexity and prior TSF case volume. Rates of adverse surgical events were significantly higher for novice TSFs than for senior TSFs. In univariable analysis, multiple renal arteries, high BMI, prior abdominal surgery, male donor, and nephrolithiasis were correlated with higher incidence of adverse surgical events. Based on the RACUSUM model, high intraoperative time is mitigated after 28 procedures, incidence of intraoperative complications tends to diminish after 24 procedures, and improvement in estimated blood loss did not remain consistent. TSFs exhibit a tipping point in LDN performance by 24–28 cases and proficiency by 35–38 cases.     

What Middle Phalanx Base Fracture Characteristics are Most Reliable and Useful for Surgical Decision-making?

Background

Fracture-dislocations of the proximal interphalangeal joint are vexing because subluxation and articular damage can lead to arthrosis and the treatments are imperfect. Ideally, a surgeon could advise a patient, based on radiographs, when the risk of problems merits operative intervention, but it is unclear if middle phalanx base fracture characteristics are sufficiently reliable to be useful for surgical decision making.

Questions/purposes

We evaluated (1) the degree of interobserver agreement as a function of fracture characteristics, (2) the differences in interobserver agreement between experienced and less-experienced hand surgeons, and (3) what fracture characteristics and surgeon characteristics were associated with the decision for operative treatment.

Methods

Ninety-nine (33%) of 296 hand surgeons evaluated 21 intraarticular middle phalanx base fractures on lateral radiographs. Eighty-one surgeons (82%) were in academic practice and 57 (58%) had less than 10 years experience. Participants assessed six fracture characteristics and recommended treatment (nonoperative or operative: extension block pinning, external fixation, open reduction and internal fixation, volar plate arthroplasty, or hemihamate autograft arthroplasty) for all cases.

Results

With all surgeons pooled together, the interobserver agreement for fracture characteristics was substantial for assessment of a 2-mm articular step or gap (kappa, 0.73; 95% CI, 0.60–0.86; p < 0.001), subluxation or dislocation (kappa, 0.72; 95% CI, 0.58–0.86; p < 0.001), and percentage of articular surface involved (intraclass correlation coefficient [ICC], 0.67; 95% CI, 0.54–0.81; p < 0.001); moderate for comminution (kappa, 0.55; 95% CI, 0.39–0.70; p < 0.001) and stability (kappa, 0.54; 95% CI, 0.39–0.69; p < 0.001); and fair for the number of fracture fragments (ICC, 0.39; 95% CI, 0.27–0.57; p < 0.001). When recommending treatment, interobserver agreement was substantial (kappa, 0.69; 95% CI, 0.50–0.88; p < 0.001) for the recommendation to operate or not to operate, but only fair (kappa, 0.34; 95% CI, 0.21–0.47; p < 0.001) for the specific type of treatment, indicating variation in operative techniques. There were no differences in agreement for any of the fracture characteristics or treatment preference between less-experienced and more-experienced surgeons, although statistical power on this comparison was low. None of the surgeon characteristics was associated with the decision for operative treatment, whereas all fracture characteristics were, except for stable and uncertain joint stability. Articular step or gap (β, 0.90; R-squared, 0.89; 95% CI, 0.75–1.05; p < 0.001), likelihood of subluxation or dislocation (β, 0.80; R-squared, 0.76; 95% CI, 0.59–1.02; p < 0.001), and unstable fractures (β, 0.88; R-squared, 0.81; 95% CI, 0.67–1.1; p < 0.001), are most strongly associated with the decision for operative treatment.

Conclusions

We found that assessment of a step or gap and likelihood of subluxation were most reliable and are strongly associated with the decision for operative treatment. Surgeons largely agree on which fractures might benefit from surgery, and the variation seems to be with the operative technique. Efforts at improving the care of these fractures should focus on the comparative effectiveness of the various operative treatment options.

Level of Evidence

Level III, diagnostic study.

Electronic supplementary material

The online version of this article (doi:10.1007/s11999-015-4394-7) contains supplementary material, which is available to authorized users.     

Evaluation of braking performances of patients with osteoarthritis of the knee or hip: Are there alternatives to a brake simulator?

ObjectiveThis study aims to develop and evaluate a simple tool for daily practice that might allow a rough estimate of individual braking performance (brake response time, BRT) of patients with osteoarthritis or those with arthroplasty of the knee or hip.MethodsIn this cross-sectional study, we examined 162 patients (72 men, 90 women; mean age = 64±12.8 years) who suffered from osteoarthritis of the knee (n=45) or hip (n=64) or who underwent a total hip (n=37) or knee (n=16) arthroplasty. BRT of each patient was measured in a brake simulator. The results were compared to demographic data, various clinical tests, and pain surveys. From these data, a multiple linear regression model was developed.ResultsFrom the observed correlations, the regression model consisted of age (correlation with BRT τ=0.176, p=0.001), sex (τ=0.361, p<0.001), Hau’s step test (τ=−0.345, p<0.001), and the pain dimension of the Hip disability/Knee injury and Osteoarthritis Outcome Score (τ=−0.265, p<0.001). We, therefore, suggested the following formula: BRTest = 634.8 - (8.8 x Hau) + 119.2 (for women) + (3.0 x age) - (1.3 x H/KOOS Pain). The above-mentioned variables contributed significantly to the prediction of BRT and could achieve a multiple R² adj of 0.31. The model leaves a residual standard error (i.e., SD of the residuals) of 158.4 ms, which is superior to a model without predictors; F (4.140)=16.8, p<0.001.ConclusionOur evaluated regression model offers an uncertainty which is comparable to the one based on a fixed time period after surgery or a defined pathologic condition. The high variability even within a single patient over several brake simulator measurements makes it unlikely for a model to be generated solely based on clinical testing. Taking the available data in literature into account, we advise caution when formulating a real-time- or condition-based recommendation. We rather suggest being aware of risk factors that might lead to impaired BRT to sensitize patients to their impaired ability to drive. We identify such risk factors, namely old age, female sex, impaired musculoskeletal function, as tested in Hau’s step test, and high levels of pain.Level of EvidenceLevel III, Therapeutic Study     

Patients With Greater Symptom Intensity and More Disability are More Likely to be Surprised by a Hand Surgeon’s Advice

BackgroundA clash between a patient’s assumptions and a doctor’s advice can feel adversarial which might influence satisfaction ratings and compliance with treatment recommendations. A better understanding of sources of patients’ bewilderment might lead to improved strategies for conveying counterintuitive information that improve patient comfort and wellbeing.Questions/purposesThis study addressed the following questions: (1) Are magnitude of disability, pain intensity, symptoms of depression, or health anxiety associated with a higher level of surprise when a patient is presented with diagnostic information and/or therapeutic recommendations? (2) Does the surgeon accurately perceive the patient’s bewilderment? (3) Does the surgeon’s perception of patient bewilderment correlate with diagnosis or a patient’s magnitude of disability, pain intensity, symptoms of depression, or health anxiety?ResultsOnly greater symptom intensity and magnitude of disability (QuickDASH) correlated with greater unexpected information when rated by the patient (ß = 0.058; p < 0.001). There was a correlation between patient surprise and the surgeon’s perception of the patient’s surprise (r = 0.58; p < 0.001). Greater surgeon-perceived patient surprise correlated with nonspecific illness (p = 0.007; ß = 3.0).ConclusionsPatients with greater symptom intensity and magnitude of disability, and perhaps also patients with nonspecific diagnoses, are more likely to be surprised by a hand surgeon’s advice. Future research might address the ability of previsit preparation (using decision aids or other alternative means of education) to ameliorate the discordance between patient assumptions and hand surgeon advice.     

The first epidemiology study of urolithiasis in New Brunswick

IntroductionUnderstanding the composition of a kidney stone is crucial in leading to proper treatment and preventing reoccurring urolithiasis. This study aimed to investigate the prevalence of urolithiasis in the province of New Brunswick (NB), Canada.MethodsA total of 3828 kidney stone analysis reports from October 1, 2016 to September 30, 2019, were reviewed from laboratory information systems. Among them, 3311 were identified as new cases. Stone compositions were analyzed by the Fourier transform infrared spectrometry. Incident rates were compared using Chi-squared analysis of different age, sex, and regional health authority (RHA) zones.ResultsThe prevalence of urolithiasis in NB was 147.8 per 100 000 person-years. Males had a significantly higher (X²=254, p<0.001) incident rate of 189 (95% confidence interval [CI] 182–198) than females (107 [95% CI 102–114]) per 100 000 person-years. Zone 1 had significantly higher (245 per 100 000 person-years, p<0.001) prevalence compared to other RHA zones. Age group over 65 years had the highest incidence rate of 253 per 100 00 person-years of all groups. The predominant kidney stone types in NB were calcium oxalate monohydrate (60.68%) and calcium oxalate dihydrate (11.58%). Those patients aged 0–18 years had a high percentage of struvite (4.32%) vs. the provincial average (2.19%) (p<0.001).ConclusionsThe prevalence of NB’s urolithiasis is slightly higher than that of Ontario. Since both zones 1.1 and 1.2 have significantly high prevalence and are situated in the Moncton area (combined zone 1), it may suggest that geographical factors play a role in the prevalence of urolithiasis in NB.     

Preoperative proteinuria may be a risk factor for postoperative acute kidney injury：a meta-analysis

ObjectiveTo investigate the relationship between preoperative proteinuria and postoperative acute kidney injury (AKI).MethodsWe performed a search on databases included PubMed, Embase, the Cochrane Library, and Web of Science, from December 2009 to September 2020. Data extracted from eligible studies were synthesized to calculate the odds ratio (OR) and 95% confidence interval (CI). A fixed or random effects model was applied to calculate the pooled OR based on heterogeneity through the included studies.ResultsThis meta-analysis of 11 observational studies included 203,987 participants, of whom 21,621 patients suffered from postoperative AKI and 182,366 patients did not suffer from postoperative AKI. The combined results demonstrated that preoperative proteinuria is an independent risk factor for postoperative AKI (adjusted OR = 1.65, 95%CI:1.44–1.89, p < 0.001). Subgroup analysis showed that both preoperative mild proteinuria (adjusted OR = 1.30, 95%CI:1.24–1.36, p < 0.001) and preoperative heavy proteinuria (adjusted OR = 1.93, 95%CI:1.65–2.27, p < 0.001) were independent risk factors for postoperative AKI. The heterogeneity was combined because its values were lower. Further subgroup analysis found that preoperative proteinuria measured using dipstick was an independent risk factor for postoperative AKI (adjusted OR = 1.48, 95%CI:1.37–1.60, p < 0.001). Finally, preoperative proteinuria was an independent risk factor for postoperative AKI in the non-cardiac surgery group (adjusted OR = 2.06, 95%CI:1.31–3.24, p = 0.002) and cardiac surgery group (adjusted OR = 1.69, 95%CI:1.39–2.06, p < 0.001)ConclusionPreoperative proteinuria is an independent risk factor for postoperative AKI and in instances when proteinuria is detected using dipsticks.     

Evaluation of surgical fellows’ laparoscopic performance using Global Operative Assessment of Laparoscopic Skills (GOALS)

Background

The acquisition of technical skills is one of the fundamental goals of postgraduate surgical training; however, validation and utilization of objective tools to assess the technical skills of trainees remains elusive. The objectives of this project are to develop models to identify predictive factors for fellow performance, validate the Global Operative Assessment of Laparoscopic Skills (GOALS) as an assessment tool for laparoscopic skills, and to define the learning curve for complex laparoscopic gastrointestinal surgery.

Methods

Using previously recorded data from a centralized database of the Fellowship Council, we analyzed the voluntarily submitted performance scores of surgical fellows for three complex laparoscopic gastrointestinal operations: Roux-en-Y gastric bypass, LapBand placement, and Nissen fundoplication. We analyzed previous experience with complex cases, previous experience with the same type of case, case difficulty, and time of year in the fellowship as potential predictors of performance. Performance scores throughout the fellowship year were graphed to create learning curves for overall performance and each of five domains of performance.

Results

Ninety-eight performance assessments were submitted for 31 unique fellows. Overall performance (p < 0.01), bimanual dexterity (p < 0.01), efficiency (p < 0.01), and autonomy (p < 0.01) all improved significantly throughout the course of the fellowship year. Performance in the domains of depth perception and tissue handling improved, but the improvement did not reach statistical significance. Three predictor variables were significantly related to performance scores.

Conclusions

This study documents that GOALS is able to differentiate novice fellows from graduating fellows and established construct validity. Models developed and tested confirmed that previous experience, case difficulty, and length of time as a fellow impacted performance.     

The association between metabolic syndrome and lower urinary tract symptoms suggestive of benign prostatic hyperplasia in aging males: evidence based on propensity score matching

BackgroundTo investigate the association between lower urinary tract symptoms suggestive of benign prostate hyperplasia (LUTS/BPH) and metabolic syndrome (MetS) in aging Chinese males.MethodsA dataset that included 3,568 non-MetS cases and 1,020 MetS cases (after data cleansing) was downloaded from the China Health and Retirement Longitudinal Study (CHARLS). To balance the intergroup covariates, propensity score matching (PSM) was employed in the analyses. Univariate logistic regression and multivariate logistic regression were then performed to investigate the relationship between LUTS/BPH and MetS in aging Chinese males.ResultsBefore PSM, multivariate logistic regression showed that participants with MetS had a 1.47 times higher risk of LUTS/BPH compared to non-MetS cases in the final model (P<0.001). It also revealed that participants with low high-density lipoprotein (HDL), abdominal adiposity, or high triglycerides had a higher probability of LUTS/BPH [odds ratio (OR) =1.56 for low HDL; OR =1.50 for abdominal adiposity; and OR =1.48 for high triglyceride, P<0.001], while participants with hyperglycemia or hypertension had identical odds of LUTS/BPH (P>0.05). After PSM, 1,000 pairs were successfully matched. It was also found that MetS cases had a 1.60 times higher risk of LUTS/BPH compared to non-MetS cases (P<0.001), and participants with low HDL, abdominal adiposity, high triglycerides, or hyperglycemia had a higher likelihood of LUTS/BPH than their counterparts (P<0.001). However, the probability of LUTS/BPH in hypertensive patients remained similar to that in non-hypertensive patients (P>0.05).ConclusionsAging Chinese males with MetS had a higher probability of LUTS/BPH. Also, patients with low HDL, abdominal obesity, high triglycerides, or hyperglycemia had an increased risk of LUTS/BPH; however, this was not the case for hypertensive patients.     

Has the Incidence of Thoracolumbar Spine Injuries Increased in the United States From 1998 to 2011?

BackgroundWhile most motor vehicle crash (MVC)-related injuries have been decreasing, one study showed increases in MVC-related spinal fractures from 1994 to 2002 in Wisconsin. To our knowledge, no studies evaluating nationwide trends of MVC-related thoracolumbar spine injuries have been published. Such fractures can cause pain, loss of functionality or even death. If the incidence of such injuries is increasing, it may provide a motive for reassessment of current vehicle safety design.Questions/purposesWe questioned whether the incidence of thoracolumbar spine injuries increased in the United States population with time (between 1998 and 2011), and if there was an increased incidence of thoracolumbar injuries, whether there were identifiable compensatory “trade-off injury” patterns, such as reductions in sacropelvic injuries.ResultsAll databases showed increases in MVC-related thoracolumbar spine injuries when adjusting for age with time. These age-adjusted relative annual percent increases ranged from 8.22% (95% CI, 5.77%–10.72%; p < 0.001) using AIS of 2 or more (AIS2 +) injury codes in the NTDB^®, 8.59% (95% CI, 5.88%-11.37%; p < 0.001) using ICD-9 codes in the NTDB^®, 8.12% (95% CI, 7.20%–9.06%; p < 0.001) using ICD-9 codes in the NIS, and 8.10 % (95% CI 5.00%–11.28%; p < 0.001) using AIS2+ injury codes in the NASS. As these thoracolumbar injuries have increased, there has been no consistent trend toward a compensatory reduction in terms of sacropelvic injuries.ConclusionsWhile other studies have shown that rates of many MVC-related injuries are declining with time, our data show increases in the incidence of thoracolumbar injury. Although more sensitive screening tools likely have resulted in earlier and increased recognition of these injuries, it cannot be stated for certain that this is the only driver of the increased incidence observed in this study. As seatbelt use has continued to increase, this trend may be the result of thoracolumbar injuries as trade-offs for other injuries, although in our study we did not see a compensatory decrease in sacropelvic injuries. Investigation evaluating the root of this pattern is warranted.     

The Increased Tibiofemoral Rotation: A Potential Contributing Factor for Patellar Maltracking in Patients with Recurrent Patellar Dislocation

ObjectiveThe purpose of this study was to analyze the relationship between tibiofemoral rotation and patellar maltracking in patients with recurrent patellar dislocation.MethodsA total of 143 consecutive knees (118 patients) with clinically diagnosed recurrent patellar dislocation from January 2018 to December 2019 were retrospectively analyzed. Patellar tilt angle and bisect offset index were recorded on axial CT to assesses the severity of patellar maltracking. Tibiofemoral rotation angle is measured by comparing the angle between the posterior femoral and tibial condylar lines on three‐dimensional CT. The Pearson correlation was calculated to investigate the association between tibiofemoral rotation angle and patellar maltracking. Patients were divided into the rotation group (≥15°) and control group (<15°) based on the value of tibiofemoral rotation and a further comparison was performed. To further clarify the complicated relationship among tibial tubercle‐trochlear groove (TT‐TG), tibial tubercle‐posterior cruciate ligament distance (TT‐PCL), tibiofemoral rotation, and patellar maltracking, patients were divided into four subgroups according to the value of TT‐TG and TT‐PCL.ResultsThe mean preoperative tibiofemoral rotation angle was 12° ± 6° (range, 0°–31°). Pearson correlation between patellar maltracking parameters (bisect offset index, patellar tilt angle) and various bony deformities found that the tibiofemoral rotation angle was moderately correlated with bisect offset index (r = 0.451, p < 0.001) and patellar tilt angle (r = 0.462, p < 0.001). Further results demonstrated that bisect offset index (152.1 vs 121.2, p < 0.001) and patellar tilt angle (41.2° vs 33.5°, p < 0.001) were significantly higher in the rotation group than that in control group. For patients with a TT‐TG distance of >20 mm, the increased TT‐TG distance was mainly caused by tibiofemoral rotation angle in group C (TT‐TG > 20 mm, TT‐PCL < 24 mm) and predominantly induced by tibial tubercle lateralization in group D (TT‐TG > 20 mm, TT‐PCL > 24 mm). Bisect offset index and patellar tilt angle were significantly higher in the group C than group D.ConclusionThe increased tibiofemoral rotation angle is associated with patellar maltracking in patients with recurrent patellar dislocation. Patients with increased tibiofemoral rotation angle usually have more severe patellar maltracking.     

Sex Differences in Cartilage Topography and Orientation of the Developing Acetabulum: Implications for Hip Preservation Surgery

BackgroundIncreased attention is being placed on hip preservation surgery in the early adolescent. An understanding of three-dimensional (3-D) acetabular development as children approach maturity is essential. Changes in acetabular orientation and cartilage topography have not previously been quantified as the adolescent acetabulum completes development.Questions/purposesWe used a novel 3-D CT analysis of acetabular development in children and adolescents to determine (1) if there were sex-specific differences in the growth rate or surface area of the acetabular articular cartilage; (2) if there were sex-specific differences in acetabular version or tilt; and (3) whether the amount of version and tilt present correlated with acetabular coverage.MethodsWe assessed acetabular morphology in 157 patients (314 hips); 71 patients were male and 86 were female. Patient ages ranged from 8 years to 17 years. A 3-D surface reconstruction of each pelvis was created from CT data using MIMICs software. Custom MATLAB software was used to obtain data from the 3-D reconstructions. We calculated articular surface area, acetabular version, and acetabular tilt as well as novel measurements of acetabular morphology, which we termed “coverage angles.” These were measured in a radial fashion in all regions of the acetabulum. Data were organized into three age groups: 8 to 10 years old, 10 to 13 years old, and 13 to 17 years old.ResultsMale patients had less acetabular anteversion in all three age groups, including at maturity (7° versus 13°, p < 0.001; 10° versus 17°, p < 0.001; 14° versus 20°, p < 0.001). Males had less acetabular tilt in all three age groups (32° versus 34°, p = 0.03; 34° versus 38°, p < 0.001; 39° versus 41°, p = 0.023). Increases in anteversion correlated with increased posterior coverage angles (r = 0.805; p < 0.001). Increases in tilt were correlated with increases in superior coverage angles (r = 0.797; p < 0.001). The posterosuperior regions of the acetabulum were the last to develop and this process occurred earlier in females compared with males. Articular surface area increased from 18 (8–10 years) to 24 mm² (13–17 years) in males and from 17 (8–10 years) to 21 mm² (13–17 years) in females. Articular surface area was higher in males beginning in the 10- to 13-year-old age group (p = 0.001).ConclusionsUsing a novel technique to analyze acetabular morphology, we found that acetabular development occurs earlier in females than males. The posterosuperior region of the acetabulum is the final region to develop. The articular cartilage surface area and articular cartilage coverage of the femoral head are increasing in addition to total coverage of the femoral head during the final stages of acetabular development.

Level of Evidence

Level III, prognostic study.

Electronic supplementary material

The online version of this article (doi:10.1007/s11999-014-4109-5) contains supplementary material, which is available to authorized users.