Faculty Bibliography

PURPOSE/OBJECTIVE:Though an increasing number of adults older than 50 years are undergoing hip arthroscopy for treatment of Femoroacetabular Impingement Syndrome (FAIS), it is unclear how their timeline for functional outcome improvement compares to that of younger patients. The purpose of this study was to assess the impact of age on time to achieving the Minimum Clinically Important Difference (MCID), Substantial Clinical Benefit (SCB), and Patient Acceptable Symptom State (PASS) following primary hip arthroscopy for FAIS. METHODS:A retrospective comparative single-surgeon cohort study of primary hip arthroscopy patients with minimum 2-year follow-up was conducted. Age categories were 20-34 years, 35-49 years, and 50-75 years. All subjects completed the modified Harris Hip Score (mHHS) prior to surgery and at 6-month, 1-year, and 2-year follow-up. 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 interval-censored survival analysis. The effect of age was adjusted for Body Mass Index (BMI), sex, and labral repair technique using an interval-censored proportional hazards model. RESULTS:Two hundred eighty-five patients were included in the analysis with 115 (40.4%) aged 20-34 years, 92 (32.3%) aged 35-49 years, and 78 (27.4%) aged 50-75 years. There were no significant differences between groups in time to achievement for the MCID (n.s.) or SCB (n.s.). However, patients in the oldest group had significantly longer time to PASS than those in the youngest group, both in the unadjusted analysis (p = 0.02) and after adjusting for BMI, sex, and labral repair technique (HR 0.68, 95% CI 0.48-0.96, p = 0.03). CONCLUSION/CONCLUSIONS:Achievement of the PASS, but not the MCID or SCB, is delayed among FAIS patients aged 50-75 years who undergo primary hip arthroscopy compared to those aged 20-34 years. Older FAIS patients should be counseled appropriately about their longer timeline to achieving hip function comparable to their younger counterparts. LEVEL OF EVIDENCE/METHODS:III.

PURPOSE/OBJECTIVE:To prospectively evaluate the effectiveness of the transmuscular quadratus lumborum block (TQLB) with pericapsular injection (PCI) versus PCI alone in patients undergoing hip arthroscopy for treatment of femoroacetabular impingement (FAI) in terms of perioperative pain control, as well as postoperative function in the postoperative anesthesia unit (PACU) setting. METHODS:Patients undergoing hip arthroscopy for FAI were prospectively randomized to receive 30 mL of 0.5% bupivacaine in a TQLB (n = 52) with PCI versus PCI alone (n = 51). The PCI included 20 mL of 0.25% bupivacaine given by the surgeon. All analyzed patients received general anesthesia. The primary outcome was postoperative pain scores assessed via the numerical rating scale (NRS) at 30 minutes postoperatively and immediately prior to discharge. Secondary outcomes were opioid utilization, expressed as morphine milligram equivalents (MMEs), PACU recovery time, quadriceps strength (assessed after completion of PACU phase 1 criteria), and adverse events (nausea/vomiting). RESULTS:Average age, body mass index, and preoperative pain assessment were not significantly different between groups. There were no differences in NRS pain scores preoperatively, 30 minutes postoperatively, or immediately prior to discharge between groups (P > .05). Intraoperative opioid consumption was significantly lower in the TQLB group (MME: 16.8 ± 7.9) compared to controls (MME 20.6 ± 8.0; P = .009). However, there was no difference in the total opioid consumption (P > .05). There was no significant difference in total PACU length of stay (minutes) between the treatment (133.0 ± 48) and control groups (123.5 ± 47; P > .05). Quadriceps weakness was not significantly different between groups (P = .2). There was no difference in the number of patients that experienced nausea or vomiting between the TQLB group and control group (13% vs 16%; P = .99). Neither group had any reported serious adverse events. CONCLUSIONS:TQLB and PCI do not improve postoperative pain scores or total opioid consumption compared to PCI alone. TQLB may decrease the amount of intraoperative opiate usage. LEVEL OF EVIDENCE/METHODS:Level I, randomized controlled trial.

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: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. LEVEL OF EVIDENCE:Level III, retrospective comparative study.

Periacetabular osteotomy (PAO) is the gold standard procedure for patients with significant hip dysplasia. Hip arthroscopy is the gold standard procedure for repairing labral tears. In the past, open PAO procedures were performed without any concomitant labral repair surgery with successful outcomes. Nevertheless, with advances in hip arthroscopy, better outcomes can be achieved by repairing the labrum, as well as performing PAO to achieve bony correction of the deformity. Whether staged or combined, hip arthroscopy plus PAO most successfully treats hip dysplasia. Fix the bony deformity, but also fix the structural damage. Repairing the labrum, combined with PAO, will lead to better outcomes.

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:The aims of the study were to (1) classify surgical centers in New York State (NYS) by volume of hip arthroscopies performed, (2) calculate rates of readmissions and complications by center volume, and (3) identify socioeconomic predictive factors for readmissions and complications following hip arthroscopy. METHODS:Patients who underwent hip arthroscopy at NYS health care facilities from 2010-2020 were retrospectively identified using the New York Statewide Planning and Research Cooperative System (SPARCS) database. Hip arthroscopic procedures were identified using the following Current Procedural Terminology (CPT) codes. Surgical center volumes were classified into three categories: low (<85th percentile), medium (85th-95th percentile), and high (>95th percentile). Incidence of readmissions and complications within 90 days was abstracted from SPARCS. Neighborhood socioeconomic status was quantified using the U.S. Area Deprivation Index (ADI). Multivariable logistic regression was used to determine whether center volume and other socioeconomic variables were independent predictors of outcomes. RESULTS:50,252 hip arthroscopy patients were identified in SPARCS from 2010-2020. Of these patients, 13,861 (27.6%) underwent surgery at low-volume centers, 11,757 (23.4%) at medium-volume centers, and 24,634 (49.0%) at high-volume centers. Minorities, publicly-insured patients, and patients from lower socioeconomic status neighborhoods made up a larger proportion of cases seen by low-volume centers versus high-volume centers (p<0.001). Patients in the low-volume group experienced significantly higher 90-day rates of readmissions (p<0.001) and all-cause complications (p<0.001) than the other groups. Furthermore, high-volume centers were independently associated with lower odds of readmission (OR=0.57, p<0.001) and all-cause complications (OR=0.73, p<0.001) versus low-volume centers. CONCLUSION/CONCLUSIONS:Low-volume surgical centers are associated with increased readmission and complication rates following hip arthroscopy, independent of other socioeconomic factors such as age, sex, race, insurance status, and neighborhood socioeconomic status.

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 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.

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.