Faculty Bibliography

PURPOSE/OBJECTIVE:The aim of our study was to identify differences in the time taken to achieve the minimum clinically important difference (MCID), substantial clinical benefit (SCB), and patient-acceptable symptom state (PASS) following primary hip arthroscopy for the treatment of femoroacetabular impingement syndrome (FAIS) among patients of different body mass index (BMI) categories. METHODS:We conducted a retrospective comparative study of hip arthroscopy patients with minimum 2-year follow-up. BMI categories were defined as normal (18.5 ≤ BMI < 25.0), overweight (25.0 ≤ BMI <30.0), or class I obese (30.0≤BMI<35.0). All subjects completed the modified Harris Hip Score (mHHS) prior to surgery and at 6 months, 1 year, and 2 years postoperative. MCID and SCB cutoffs were defined as pre-to-postoperative increases in mHHS by ≥8.2 and ≥19.8, respectively. PASS cutoff was set at postoperative mHHS ≥74. Time to achievement of each milestone was compared using the interval-censored EMICM algorithm. The effect of BMI was adjusted for age and sex using an interval-censored proportional hazards model. RESULTS:285 patients were included in the analysis: 150 (52.6%) normal BMI, 99 (34.7%) overweight, and 36 (12.6%) obese. Obese patients had lower mHHS at baseline (P = .006) and at 2-year follow-up (P = .008). There were no significant intergroup differences in time to achievement for MCID (P = .92) or SCB (P = .69), but obese patients had longer time to PASS than normal BMI patients (P = .047). Multivariable analysis found obesity to be predictive of longer time to PASS (HR = .55; P = .007) but not MCID (HR = 0.91; P = .68) or SCB (HR = 1.06; P = .30). CONCLUSIONS:Class I obesity is associated with delays in achieving a literature-defined PASS threshold after primary hip arthroscopy for FAIS. However, future research should consider incorporating PASS anchor questions to determine whether obesity truly carries a risk of delayed achievement of a satisfactory state of health as it pertains to the hip. LEVEL OF EVIDENCE/METHODS:III, retrospective comparative study.

PURPOSE/OBJECTIVE:To assess clinical outcomes among patients aged 50 years or older after primary hip arthroscopy for femoroacetabular impingement (FAI) with or without labral tears compared with a matched control group of younger patients aged 20 to 35 years old at minimum 5-year follow-up. METHODS:We conducted a retrospective comparative prognostic study using a prospectively collected database of patients who underwent hip arthroscopy with minimum 5-year follow-up. Subjects completed the modified Harris Hip Score (mHHS) and Non-Arthritic Hip Score (NAHS) before surgery and at 5-year follow-up. Patients aged ≥50 years were propensity score matched on sex, body mass index, and preoperative mHHS to controls aged 20 to 35 years. Pre- to postoperative changes in mHHS and NAHS were compared between groups using the Mann-Whitney U test. Hip survivorship rates and minimum clinically important difference achievement rates were compared between groups using the Fisher exact test. P values <.05 were considered statistically significant. RESULTS:In total, 35 older patients (mean age 58.3 years) were matched to 35 younger controls (mean age 29.2 years). Both groups were mostly female (65.7%) and had equal mean body mass index (26.0). Acetabular chondral lesions of Outerbridge grades III-IV were more prevalent in the older group (older 28.6% vs younger 0%, P < .001). Five-year reoperation rates were not significantly different between the groups (older 8.6% vs younger 2.9%, P = .61). There were no significant intergroup differences in 5-year improvement in mHHS (older 32.7 vs younger 30.6, P = .46) or NAHS (older 34.4 vs younger 37.9, P = .70) or in 5-year minimum clinically important difference achievement rates for the mHHS (older 93.6% vs younger 93.6%, P = 1.00) or NAHS (older 87.1% vs younger 96.8%, P = .35). CONCLUSIONS:There are no significant differences in reoperation rates and patient-reported outcomes between patients aged ≥50 years versus matched controls aged 20 to 35 years after primary hip arthroscopy for FAI. LEVEL OF EVIDENCE/METHODS:III, retrospective comparative prognostic study.

PURPOSE/OBJECTIVE:The indications for surgical treatment of proximal hamstring ruptures are continuing to be refined. The purpose of this study was to compare patient-reported outcomes (PROs) between patients who underwent operative or nonoperative management of proximal hamstring ruptures. METHODS:A retrospective review of the electronic medical record identified all patients who were treated for a proximal hamstring rupture at our institution from 2013 to 2020. Patients were stratified into two groups, nonoperative or operative management, which were matched in a 2:1 ratio based on demographics (age, gender, and body mass index), chronicity of the injury, tendon retraction, and number of tendons torn. All patients completed a series of PROs including the Perth Hamstring Assessment Tool (PHAT), Visual Analogue Scale for pain (VAS), and the Tegner Activity Scale. Statistical analysis was performed using multi-variable linear regression and Mann-Whitney testing to compare nonparametric groups. RESULTS:Fifty-four patients (mean age = 49.6 ± 12.9 years; median: 49.1; range: 19-73) with proximal hamstring ruptures treated nonoperatively were successfully matched 2:1 to 27 patients who had underwent primary surgical repair. There were no differences in PROs between the nonoperative and operative cohorts (n.s.). Chronicity of the injury and older age correlated with significantly worse PROs across the entire cohort (p < 0.05). CONCLUSIONS:In this cohort of primarily middle-aged patients with proximal hamstring ruptures with less than three centimeters of tendon retraction, there was no difference in patient-reported outcome scores between matched cohorts of operatively and nonoperatively managed injuries. LEVEL OF EVIDENCE/METHODS:Level III.

PURPOSE/OBJECTIVE:To determine whether the presence of spine pathology affects clinical outcomes after hip arthroscopy for femoroacetabular impingement syndrome (FAIS) in the setting of hip-spine syndrome (HSS). METHODS:A systematic review of PUBMED and Cochrane was conducted. Primary research articles evaluating patient-reported outcomes (PRO) after hip arthroscopy for FAIS in the presence of concomitant spine pathology were considered. RESULTS:Literature review identified twelve studies meeting criteria. In 2109 FAIS patients undergoing hip arthroscopy, 591 had concomitant spine pathology. Baseline PROs in the hip-spine (mHHS: 39.8-65.29 versus 56.9-78.8, 8 studies; NAHS: 42.2-51.5 versus 68.2-75.2, 4 studies; HOS-ADL: 45.9-71.1 versus 49.3-89.51, 9 studies; HOS-Sport: 22.8-49.6 versus 50.6-73.1, 3 studies; iHOT-12: 38.0 versus 66.0, 1 study; VAS Pain: 6.43-6.56 versus 1.18-3.60, 3 studies; VAS Satisfaction: 7.18-7.46 range at follow up, 2 studies) and control (mHHS: 39.3-64.9 versus 70.2-92.6, 6 studies; NAHS: 42.8-54.2 versus 74.0-87.1, 4 studies; HOS-ADL: 59.0-76.4 versus 75.4-97.1, 4 studies; HOS-Sport: 38.1-55.1 versus 60.9-93.9, 3 studies; iHOT-12: 43.4 versus 89.8, 1 study; VAS Pain: 6.18-6.22 versus 1.82-3.44, 2 studies; VAS Satisfaction: 7.74-8.22 range at follow up, 2 studies). Minimal clinically important difference threshold rates achieved in the hip-spine (44.1-86.7, 4 studies) cohorts were significantly lower than control (79.4-88.2%; 4 studies) cohorts in 3 studies. Patient acceptable symptomatic state threshold rates achieved in the hip-spine (42-63.5, 3 studies) cohorts were significantly lower than control (58.8-81.0, 3 studies) in 1 study. There was no statistical difference in complication and re-operation rates between cohorts. CONCLUSION/CONCLUSIONS:FAIS patients with concomitant HSS have improved but inferior outcomes after hip arthroscopy compared to patients without HSS.

INTRODUCTION/BACKGROUND:Prior studies of hamstring tendon tears have reported varied findings on whether increased delay from injury to surgery is associated with worse outcomes. The purpose of this study was to determine whether increased time from injury to surgical repair is associated with worse clinical outcomes in patients with proximal hamstring ruptures. MATERIALS AND METHODS/METHODS:Patients who underwent surgical repair of a proximal hamstring rupture from 2010 to 2019 were followed for a minimum of 24 months from surgery. A cutoff of 6 weeks from injury to the time of surgery was used to distinguish between acute and chronic ruptures. All patients completed patient-reported outcome measures (PROs) at the final follow-up. Multiple factors were analyzed for their effects on PROs including time to surgery, amount of tendon retraction, and demographics such as sex and age. RESULTS:Complete data sets were obtained for 38 patients at a mean follow-up of 4.9 years. All data is reported as a mean ± standard deviation. Patients who underwent acute repair of proximal hamstring ruptures had significantly greater Perth Hamstring Assessment Tool (PHAT) scores than those who underwent chronic repair (76.9 ± 18.8 vs 60.6 ± 18.2, p = 0.01). Increased time to surgery was significantly correlated with worse PHAT scores (ρ = - 0.47, p = 0.003). There was no difference in PROs based on the amount of tendon retraction, number of tendons torn, sex, smoking status, or BMI. CONCLUSIONS:This study found that acute repair performed within 6 weeks of injury appears to yield improved PROs compared to chronic repair. These data highlight the importance of timely and accurate diagnosis of proximal hamstring ruptures and early operative intervention for surgical candidates.

Eponyms, while inherently flawed, remain a constant in medical vernacular, especially in orthopaedic surgery. It is essential to understand how these eponyms came to be named and for whom they were named after in order to understand their correct usage and definitions. In this second part of a 2-part review, we describe the history of eponym usage in the radiography of the adult hip; who, when, what, where, and how. We hope to provide a historical perspective of interest, resolve any controversies in semantic definitions, and create a comprehensive library of eponymous terms related to adult hip radiography.

Purpose: To describe the clinical and patient-reported outcomes of heterotopic ossification (HO) excision as well as the results of a standardized HO prophylaxis protocol among a group of patients who previously underwent open or arthroscopic hip surgery. Methods: Patients who developed HO after index hip surgery and were subsequently treated with arthroscopic excision of HO and postoperative HO prophylaxis using 2 weeks of indomethacin and radiation were retrospectively identified. All patients were seen by a single surgeon and were treated with the same arthroscopic technique. Patients were also placed on a regimen of 2 weeks of indomethacin 50 mg and radiation therapy with 700 cGy in one fraction on the first postoperative day. Outcomes assessed included recurrence of HO and conversion to total hip arthroplasty by latest follow-up. Other outcomes included Modified Harris Hip Scores and Non-Arthritic Hip Scores, which were collected preoperatively and at 1-year and 2-year follow-up. Results: There were 5 female and 9 male subjects, with an average age of 39 years (range 22-66) and average body mass index of 27.1 (19.1-37.5). Average follow-up time was 46 months (range 4-136). No patients had experienced HO recurrence by latest follow-up. Only 2 patients converted to total hip arthroplasty, one at 6 months and the other at 11 months postexcision. Average outcome scores improved by 2-year follow-up (average Modified Harris Hip Scores 52.8 improved to 86.5, average Non-Arthritic Hip Scores 49.4 improved to 83.8). Conclusions: Minimally invasive arthroscopic excision of HO and postoperative prophylaxis with combined indomethacin and radiation therapy effectively treats and prevents the recurrence of HO. Level of Evidence: Level IV, case series, therapeutic.

BACKGROUND:Magnetic resonance imaging (MRI) is an integral component of the treatment algorithm for proximal hamstring avulsion injuries. OBJECTIVE:The purpose of this study was to survey orthopedic surgeons and musculoskeletal radiologists on the reporting and analysis of proximal hamstring avulsions on MRI. METHODS:Two online surveys were developed to evaluate musculoskeletal radiologists' and orthopedic surgeons' perceptions of MRI-reporting for proximal hamstring avulsion injuries. Each survey was designed to provide information on physicians' best practices with respect to four primary questions (1) ischial tuberosity landmark determination (2) difficulties associated with measuring tendon retraction, (3) important ancillary findings, and (4) perceived clinical impact of measured retraction. Descriptive statistics were calculated for all categorical variables, which were reported as frequencies with percentages. Chi-squared test was utilized to compare rates of responses between surgeons and radiologists. Statistically significant differences were analyzed with post-hoc Fisher's exact tests; p < 0.05 considered statistically significant. RESULTS:218-Musculoskeletal radiologists and 33-orthopedic surgeons responded to their respective surveys. There were statistically significant differences with responses to two of the questions asked in both surveys; (1) in cases of complete hamstring avulsion (avulsion of both the semimembranosus and conjoint tendon), which arrow represents the tendon gap measurement used for planning surgery? p = 0.028; (2) in cases of avulsion of only the conjoint tendon, which arrow represents the tendon gap measurement used for planning surgery? p = 0.013. Post-hoc testing demonstrated that for either partial or complete hamstring avulsions, more surgeons use the conjoint tendon origin to measure tendon retraction than radiologists (p < 0.05 for both). Significantly more radiologists use the semimembranosus origin to measure hamstring retraction for partial or complete hamstring tears (p < 0.05 for both). However, for each of these questions, both radiologists and surgeons most frequently stated that the conjoint tendon landmark should be used for surgical planning. CONCLUSION/CONCLUSIONS:Musculoskeletal radiologists and orthopedists frequently utilize the conjoint tendon origin as an anatomic landmark for measuring complete and partial proximal hamstring avulsion injuries; though, orthopedists are more likely to utilize this landmark. Additionally, the broad surface area of the ischial tuberosity may lead to variability in measurement. CLINICAL IMPACT/CONCLUSIONS:Standard landmarks at the ischial tuberosity and/or detailed descriptions of tendon retractions would improve communication between radiologists and surgeons for proximal hamstring avulsions.

INTRODUCTION/UNASSIGNED:Femoroacetabular Impingement (FAI) is a hip pathology characterized by impingement of the femoral head-neck junction against the acetabular rim, due to abnormalities in bone morphology. FAI is normally diagnosed by manual evaluation of morphologic features on magnetic resonance imaging (MRI). In this study, we assess, for the first time, the feasibility of using radiomics to detect FAI by automatically extracting quantitative features from images. MATERIAL AND METHODS/UNASSIGNED:-value, for a total of 48 subsets. For each subset, a K-nearest neighbor model was trained to differentiate between IJ and HJ using the values of the radiomic features in the subset as input. The training was repeated 100 times, randomly subdividing the data with 75%/25% training/testing. RESULTS/UNASSIGNED:The texture-based gray level features yielded the highest prediction max accuracy (0.972) with the smallest subset of features. This suggests that the gray image values are more homogeneously distributed in the HJ in comparison to IJ, which could be due to stress-related inflammation resulting from impingement. CONCLUSIONS/UNASSIGNED:We showed that radiomics can automatically distinguish IJ from HJ using water-only Dixon MRI. To our knowledge, this is the first application of radiomics for FAI diagnosis. We reported an accuracy greater than 97%, which is higher than the 90% accuracy for detecting FAI reported for standard diagnostic tests (90%). Our proposed radiomic analysis could be combined with methods for automated joint segmentation to rapidly identify patients with FAI, avoiding time-consuming radiological measurements of bone morphology.

PURPOSE/OBJECTIVE:The purpose of this study was to evaluate out- comes of hip arthroscopy for femoroacetabular impingement (FAI) in female patients at 5-year follow-up. The working hypothesis for this study was that increased age and body mass index (BMI) would be associated with poor outcomes. METHODS:This study included all female patients 14 years and older who underwent primary hip arthroscopy for FAI with 5-year patient-reported outcome scores. Patients were separated into three age-based cohorts (< 30 years old, 30 to 45 years old, and > 45 years old) for subsequent statistical analysis. This analysis included a comparison of patient demographic information, intraoperative pathology, and functional outcome scores (modified Harris Hip Score [mHHS] and nonarthritic hip score [NAHS]). Statistically significant values were utilized in a regression-based analy- sis to determine predictors of 5-year outcomes in female patients. A p-value of < 0.05 was considered to be statisti- cally significant. RESULTS:Overall, 97 patients met the inclusion criteria, and there was no significant difference in patient demo- graphics (other than age and BMI) or in intraoperative pathologies identified. There were no significant difference across the three groups for mHHS and NAHS at baseline (p > 0.05). At baseline, there were no statistically significant differences between groups for NAHS scores, however < 30-year-old and 30- to 45-year-old cohorts had superior final NAHS scores relative to the > 45-year-old cohort (p = 0.005). At 5-year follow-up, the NAHS scores were significantly better for patients under 30 and 30 to 45 year olds relative to patients over 45 (84.2 ± 15.1 vs. 86.7 ± 11.0 vs. 71.9 ± 26.8, respectively; p = 0.005). Overall, 88 patients (91%) met the minimal clinically important differ- ence (MCID), and 60 patients (62%) achieved the patient acceptable symptomatic state (PASS). Baseline mHHS and BMI were shown to be statistically significant predictors of achieving MCID at 5 years in multivariate analysis (p < 0.001). CONCLUSION/CONCLUSIONS:The results of this study suggest that women generally have good-to-excellent outcomes following hip ar- throscopy, although females older than 45 may have inferior outcomes relative to younger patients, and BMI and baseline mHHS may be utilized to predict long-term improvement.