Is a short stem suitable for patients with hip dysplasia? A report on technical problems encountered during femoral reconstruction

2017 ◽  
Vol 28 (3) ◽  
pp. 315-323 ◽  
Author(s):  
Martin A. Buttaro ◽  
Pablo A. Slullitel ◽  
Gerardo Zanotti ◽  
Fernando M. Comba ◽  
Francisco Piccaluga
Keyword(s):  
Hip Dysplasia ◽  
Short Stem ◽  
Harris Hip Score ◽  
Acetabular Cup ◽  
Technical Problems ◽  
End Point ◽  
Modified Harris Hip Score ◽  
Short Stems ◽  
Femoral Reconstruction

Introduction: A wide variety of stems have been used for the treatment of osteoarthritis secondary to advanced hip dysplasia. Since evidence for using short stems in dysplastic hips is limited, we planned to analyse the technical problems encountered when reconstructing the proximal femur of patients with osteoarthritis secondary to congenital dysplasia of the hip treated with total hip arthroplasty (THA) using a type 2B short stem. Methods: We prospectively analysed 17 patients (22 hips) treated with primary THA performed with a single-branded short uncemented stem with metaphyseal fixation (MiniHip™; Corin). We excluded cases in which other type of stems were used, or in which retrospective data was only available. Mean follow-up was 41.22 months (minimum 24). We analysed clinical outcome using the modified Harris Hip Score (mHHS) and pain using the visual analogue scale (VAS). Radiographs were examined in order to determine causes of complications and revision surgery. Results: All patients showed statistically significant improvement when preoperative and postoperative values for mHHS (54.19 vs. 94.57; p = 0.0001) and for pain VAS (8.71 vs. 0.71; p = 0.0003) were compared. No cases of thigh pain, instability or infection were found. 1 case of acetabular cup loosening and 1 case of periprosthetic fracture were diagnosed at 8 months and 45 days, respectively. Overall survival was 84.7% at 5 years (CI 95%, 64.4-105.3) with revision for any reason as an end point. When stem performance was separately evaluated, it showed a survival rate of 100% at 5 years with revision for aseptic loosening as an end point. Conclusions: THA with a type 2B short stem for the treatment of dysplastic osteoarthritis showed very few technical intraoperative problems, being a useful alternative for femoral reconstruction.

scholarly journals Five-year results of a cementless short-hip-stem prosthesis

2013 ◽  
Vol 5 (1) ◽  
pp. 4 ◽  
Author(s):  
Ralf H. Wittenberg ◽  
Reinhard Steffen ◽  
Hennig Windhagen ◽  
Petra Bücking ◽  
Andreas Wilcke
Keyword(s):  
Revision Surgery ◽  
Bacterial Infections ◽  
Primary Standard ◽  
Short Stem ◽  
Stem Length ◽  
Long Term Results ◽  
Harris Hip Score ◽  
Joint Dislocations ◽  
Short Stems

Hip prosthesis stems with a short stem length and proximal fixation geometry support a bone-preserving and muscle-sparing implantation and should also allow for revision surgery with a standard hip stem. We present 250 prospectively documented clinical and radiological results from the Metha Short Hip Stem prosthesis (B. Braun-Aesculap, Tuttlingen, Germany) after an average follow-up of 4.9 years. The average patient age at surgery was 60 years. Indication for total hip replacement was primary osteoarthrosis (OA) (78% of patients), OA based on developmental dyspla- sia of the hip (16%), and other indications (6%). At the last follow-up, the average Harris Hip Score was 97 points. 85% of patients were very satisfied and 14% were satisfied after surgery, whereas 1% were dissatisfied. Pain according to the Visual Analogue Scale improved from 7.4 (min 1.6, max 9.5) pre-operatively to 0.23 (min 0, max 6.6). No joint dislocations occurred when predominantly using 28 mm and 32 mm prosthesis heads. Nine short-stems were revised: three after bacterial infections, two after primary via valsa with penetration of the femoral cortex two and three months after surgery, and three after early aseptic cases of loosening within the first year. A further nine osseously consolidated short-stems had to be replaced due to breakage of the modular titanium cone adapter after an average of 3.1 years (min 1.9, max 4.4). All surgical revisions were performed using primary standard stems. Without taking the material-related adapter failures into account, a five year Kaplan-Meier survival rate of 96.7% (95% confidence interval 93.4-98.3) was determined for the short-stem prostheses. There were no radiological signs of loosening in any of the short-stem prostheses at the last examination. Fine sclerotic lines were detected in Gruen’s AP zones 1 (19%) and 2 (10.5%), individual hypertrophies in zone 3 (3.5%), fine seams in zones 4 (5.5%) and 5 (4%), without pedestal formations in zone 4, clear cancellous bone compressions in zone 6 (97.5%), as well as single fine scleroses (1.5%) and atrophies (2.5%) in zone 7. The mid-term clinical results with periprosthetic bone remodeling and without radiological signs of loosening confirm this metaphyseal short-stem treatment and fixation concept and the possibility of revision surgery using standard hip stems. Long-term results must be further observed on a prospective basis as part of this collective study.

scholarly journals Functional outcome of total hip replacement using a short stem implant

2019 ◽  
Vol 5 (3) ◽  
pp. 449
Author(s):  
Rajiv Kapila ◽  
Mukand Lal ◽  
Preeti Takkar Kapila
Keyword(s):  
Total Hip Replacement ◽  
Hip Replacement ◽  
Stress Shielding ◽  
Thigh Pain ◽  
Short Stem ◽  
Harris Hip Score ◽  
Total Hip ◽  
Post Operative Period ◽  
Modified Harris Hip Score

<p class="abstract"><strong>Background:</strong> Conventional cementless THA is associated with stress shielding of the proximal femur and thigh pain. Short femoral stem can conserve bone, reduce stress shielding in the femur and reduce thigh pain. The present study aims to describe the functional outcomes associated with short stem metaphyseal implant in THA in our department.</p><p class="abstract"><strong>Methods:</strong> This prospective study was conducted in the Department of Orthopaedic Surgery, Indira Gandhi Medical College, Shimla among patients who needed THA for painful disabling hip. Modified Harris hip scores (HHS) were assessed for all patients pre-operatively and at their final follow up.<strong></strong></p><p class="abstract"><strong>Results:</strong> During the study period, a total of 20 patients were included in the study, 20% of them were females. The most common indication for THA was avascular necrosis head of femur with secondary osteomyelitis (n=14), of which 12 cases had excellent Hip Harris Score while two were in good category. Modified Harris hip score was excellent in patients where early partial and full weight bearing was started. Per-operatively, there was only one complication of fracture greater trochanter which was fixed with cerclage wire. In early post-operative period, two cases of superficial infection were noted and one case of varus malposition was present. In late post operative period, there were three cases of varus malposition and one case of deep infection as sinus.</p><p class="abstract"><strong>Conclusions:</strong> Total hip replacement with short anatomical metaphyseal loading stem improved the modified Harris Hip score significantly, with very few complications. Future multicentric studies are needed to evaluate the efficacy of short stem implants over a long follow up period.</p>

scholarly journals Mid-term results of a new-generation calcar-guided short stem in THA: clinical and radiological 5-year follow-up of 216 cases

2019 ◽  
Vol 20 (1) ◽  
Author(s):  
Karl Philipp Kutzner ◽  
Stefanie Donner ◽  
Lennard Loweg ◽  
Philipp Rehbein ◽  
Jens Dargel ◽  
...  
Keyword(s):  
Bone Resorption ◽  
Weight Bearing ◽  
Short Stem ◽  
Long Term Results ◽  
Harris Hip Score ◽  
Safe Procedure ◽  
Cementless Cup ◽  
Cortical Hypertrophy ◽  
Short Stems

Abstract Background In recent years, a variety of short stems have been introduced. To date, mid- and long-term results of calcar-guided short-stem designs have been rarely available. Materials and methods Two hundred and sixteen calcar-guided short stems were included in combination with a cementless cup in a prospective study. Patients were allowed full weight-bearing on the first day postoperatively. Harris hip score (HHS) as well as pain and satisfaction on visual analogue scale (VAS) were assessed during a median follow-up of 61.7 months. Standardised radiographs were analysed at predefined time points regarding radiological alterations such as bone resorption and remodelling, radiolucency, osteolysis and cortical hypertrophy using modified Gruen zones. Results At mid-term follow-up, no revision surgery of the stem had to be performed in the whole collective. At 5 years, HHS was 97.8 (SD 4.7), satisfaction on VAS was 9.7 (SD 0.7), rest pain on VAS was 0.1 (SD 0.5), and load pain on VAS was 0.6 (SD 1.2). Compared to the 2-year results, femoral bone resorption increased significantly at the 5-year follow-up (3.9% versus 42.3%). Rate of femoral cortical hypertrophy remained stable, occurring in a total of 9 hips (4.5%). At the 5-year follow-up, 2 stems (1.0%) showed non-progressive radiolucent lines with a maximum width of 2 mm. Signs of osteolysis were not observed. Compared to the 2-year follow-up, no further subsidence was observed. Conclusions The rate of stem revision (0%) at the mid-term follow-up was remarkable and indicates the principle of using a calcar-guided short stem as being a safe procedure. However, signs of bone-remodelling, indicating some amount of stress-shielding, must be acknowledged at 5 years depending on stem alignment and type of anchorage. Level of evidence IV, Prospective observational study Trial registration German Clinical Trials Register, DRKS00012634, 07/07/2017 (retrospectively registered)

scholarly journals Clinical results of the Metha short hip stem: a perspective for younger patients?

2013 ◽  
Vol 5 (4) ◽  
pp. 34 ◽  
Author(s):  
Fritz Thorey ◽  
Claudia Hoefer ◽  
Nima Abdi-Tabari ◽  
Matthias Lerch ◽  
Stefan Budde ◽  
...  
Keyword(s):  
Bone Ingrowth ◽  
Long Term Results ◽  
Harris Hip Score ◽  
Femoral Revision ◽  
Term Survival ◽  
Younger Patients ◽  
The Mean ◽  
Short Stems

In recent years, various uncemented proximal metaphyseal hip stems were introduced for younger patients as a bone preserving strategy. Initial osteodensitometric analyses of the surrounding bone of short stems indicate an increase of bone mass with secondary bone ingrowth fixation as a predictor of long-term survival of these types of implants. We report the outcome of 151 modular Metha short hip stem implants in 148 patients between March 2005 and October 2007. The mean follow-up was 5.8±0.7 years and the mean age of the patients was 55.7±9.8 years. Along with demographic data and co-morbidities, the Harris Hip Score (HHS), the Hip dysfunction and Osteoarthritis Outcome Score (HOOS), and also the results of a patient-administered questionnaire were recorded pre-operatively and at follow-up. The mean HHS increased from 46±17 pre-operatively to 90±5 the HOOS improved from 55±16 pre-operatively to 89±10 at the final follow-up. A total of three patients have been revised, two for subsidence with femoral revision and one for infection without femoral revision (Kaplan Meier survival estimate 98%). The radiological findings showed no radiolucent lines in any of the patients. The modular Metha short hip stem was implanted in younger patients, who reported an overall high level of satisfaction. The clinical and radiographic results give support to the principle of using short stems with metaphyseal anchorage. However, long-term results are necessary to confirm the success of this concept in the years to come.

Mid-term Results of Hydroxyapatite-Coated Threaded Cup Implanted without Supplementary Supporting Screws

2009 ◽  
Vol 19 (2) ◽  
pp. 102-108 ◽  
Author(s):  
Stergios J. Trapotsis ◽  
George E. Petsatodis ◽  
Petros D. Antonarakos ◽  
Panagiotis K. Givissis ◽  
Anastasios G. Christodoulou ◽  
...  
Keyword(s):  
Second Generation ◽  
Bone Ingrowth ◽  
Harris Hip Score ◽  
Radiographic Examination ◽  
Acetabular Cup ◽  
Osteolytic Lesions ◽  
The Stability ◽  
Hip Arthroplasties ◽  
Mid Term Results

We retrospectively reviewed the clinical, radiographic, and survivorship outcomes in a series of 180 patients that underwent 204 primary Total Hip Arthroplasties with the use of a second generation threaded hydroxyapatite-coated acetabular cup that was implanted without any supplementary supporting screws. At an average follow-up period of 10.2 (range: 8–14) years, one hundred and seventy-four patients (198 cups) were available for assessment. All patients underwent detailed physical and radiographic examination; their functional status was evaluated according to the Harris Hip Score (HHS). Following their digitization, all radiographs were further reviewed in order to determine the existence of any migration of the acetabular cup. Osteolytic lesions, radiolucent lines or zones of increased bone density were also recorded and classified according to the system of DeLee & Charnley. The modified Engh's criteria were used in order to evaluate the stability of the prosthesis. The patients' mean HHS at their latest follow-up visit (97.24 points) was statistically significantly better than the preoperative mean score of 40.31 points (p<0.001). Radiographic analysis showed “stable with bone ingrowth” fixation (modified Engh's criteria) of all implants with no significant migration of the cup (mean cranial migration: 0.597 mm, mean horizontal migration: 0.607 mm, mean observed difference of the cup's inclination angle: 0.26 degrees). No areas of significant osteolysis were found. The cumulative survival rate of the implants was 97.05%. Our results suggest that second generation hydroxyapatite-coated threaded acetabular cups can be successfully implanted (and achieve excellent results) without the use of any supplementary supporting screws.

scholarly journals The utility of hip arthroscopy for patients with painful borderline hip dysplasia

2020 ◽  
Vol 28 (2) ◽  
pp. 230949902092316
Author(s):  
Deuk-Soo Hwang ◽  
Chan Kang ◽  
Jeong-Kil Lee ◽  
Jae-Young Park ◽  
Long Zheng ◽  
...  
Keyword(s):  
Patient Satisfaction ◽  
Hip Arthroscopy ◽  
Hip Dysplasia ◽  
Reoperation Rate ◽  
Labral Repair ◽  
Harris Hip Score ◽  
Control Group ◽  
The Mean ◽  
Tönnis Grade

Purpose: We measured the width of the acetabular labra in, and the clinical outcomes of, patients with borderline hip dysplasia (HD) who underwent arthroscopy. Methods: A total of 1436 patients who underwent hip arthroscopy to treat symptomatic, acetabular labral tears were enrolled. From this cohort, we extracted a borderline HD group (162 cases). Lateral labral widths were evaluated using preoperative magnetic resonance imaging scans. Clinical data including the modified Harris hip score (mHHS), non-arthritic hip score (NAHS), hip outcome score–activity of daily living (HOS-ADL) score, visual analog scale (VAS) pain score, and Tönnis grade were collected. In addition, patient satisfaction with arthroscopy outcomes was rated. All complications and reoperations were noted. Results: The mean follow-up time was 87.4 months. The lateral labral width was 7.64 mm in those with normal hips and 7.73 mm in borderline HD patients, respectively ( p = 0.870). The Tönnis grade progressed mildly from 0.46 to 0.76 ( p = 0.227). At the last follow-up, clinical outcome scores (mHHS, NAHS, and HOS-ADL scores) and the VAS score were improved ( p < 0.001). The mean patient satisfaction was scored at 8.2. The reoperation rate was higher in those who underwent labral debridement (25.6%) than labral repair (4.1%). Conclusions: The lateral labral width did not differ significantly between the borderline HD group and the nondysplastic control group. Arthroscopy relieved the symptoms of painful borderline HD and did not accelerate osteoarthritis. Therefore, if such patients do not respond to conservative treatment, hip arthroscopy can be considered for further treatment.

Clinical and Radiographic Presentation of Capsular Iatrogenic Hip Instability After Previous Hip Arthroscopy

2020 ◽  
Vol 48 (12) ◽  
pp. 2927-2932
Author(s):  
Dillon C. O’Neill ◽  
Alexander J. Mortensen ◽  
Peter C. Cannamela ◽  
Stephen K. Aoki
Keyword(s):  
Hip Arthroscopy ◽  
Daily Living ◽  
Patient Reported Outcomes ◽  
Harris Hip Score ◽  
Hip Instability ◽  
Computer Adaptive Test ◽  
Adaptive Test ◽  
Patient Reported ◽  
Modified Harris Hip Score

Background: The clinical and radiographic features of iatrogenic hip instability following hip arthroscopy have been described. However, the prevalence of presenting symptoms and associated imaging findings in patients with hip instability has not been reported. Purpose: To detail the prevalence of clinical and magnetic resonance arthrogram (MRA) findings in a cohort of patients with isolated hip instability and to determine midterm patient-reported outcomes in this patient population. Study Design: Case series; Level of evidence, 4. Methods: We retrospectively reviewed patients from 2014 to 2016 who underwent an isolated capsular repair in the revision hip arthroscopy setting. Patients were excluded if they underwent any concomitant procedures, such as labral repair, reconstruction, femoral osteoplasty, or any other related procedure. Several clinical data points were reviewed, including painful activities, mechanical symptoms, subjective instability, Beighton scores, axial distraction testing (pain, toggle, and apprehension), and distractibility under anesthesia. Patient-reported outcomes—including modified Harris Hip Score, Hip Outcome Score–Sports Subscale, Patient-Reported Outcome Measurement Information System (PROMIS) Physical Function Computer Adaptive Test, and a return patient hip questionnaire—were collected pre- and postoperatively. Pre-revision radiographs were obtained, and lateral center-edge angle and alpha angle were measured on anteroposterior and frog-leg lateral views, respectively. Pre-revision MRAs were reviewed and evaluated for capsular changes. Capsular changes were defined as follows: 0, normal; 1, capsular redundancy; 2, focal capsular rent; and 3, gross extravasation of fluid from the capsule. Results: A total of 31 patients met inclusion criteria (5 male, 26 female; 14 right and 17 left hips). The mean age of patients was 36 years (range, 20-58 years). Overall, 27 (87%) reported hip pain with activities of daily living, and 31 (100%) experienced pain with sports or exercise. In addition, 24 (77%) had at least 1 positive finding on axial distraction testing. All patients had evidence of capsular changes on review of pre-revision MRAs. Out of 31 patients, 23 (74%) were available for follow-up at a minimum of 3.3 years and a mean ± SD of 4.6 ± 0.8 years. On average, modified Harris Hip Score improved by 20.3, Hip Outcome Score–Sports Subscale by 25.1, and PROMIS Physical Function Computer Adaptive Test by 6.4. Additionally, 20 (87%) patients reported improved or much improved physical ability, and 18 (78%) reported improved or much improved pain. Conclusion: The current study suggests that patients with hip instability demonstrate high rates of pain with activities of daily living and exercise, positive findings on axial distraction testing, and evidence of capsular changes on magnetic resonance imaging. Furthermore, these patients improve with revision surgery for capsular repair at midterm follow-up.

scholarly journals Primary stability of calcar-guided short-stem total hip arthroplasty in the treatment of osteonecrosis of the femoral head: migration analysis using EBRA-FCA

2020 ◽  
Vol 140 (12) ◽  
pp. 2091-2100
Author(s):  
Yama Afghanyar ◽  
Christoph Danckwardt ◽  
Miriam Schwieger ◽  
Uwe Felmeden ◽  
Philipp Drees ◽  
...  
Keyword(s):  
Femoral Head ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Migration Pattern ◽  
Short Stem ◽  
Stem Design ◽  
Total Hip ◽  
Migration Analysis ◽  
Short Stems

Abstract Introduction Osteonecrosis of the femoral head (ONFH) is a disabling condition that often results in secondary arthritis necessitating total hip arthroplasty (THA). Short-stem THA has constantly gained popularity. It remains controversial, whether ONFH represents a risk factor for failure after the implantation of short stems with pronounced metaphyseal anchorage. The potential spread of the osteonecrotic area and bone marrow edema into the metaphyseal bone might result in compromised stability. Early implant migration is considered predictive of subsequent aseptic loosening. The purpose of this study was a migration analysis of a modern, calcar-guided short-stem implant in patients with ONFH in a mid-term follow-up. Materials and methods This retrospective analysis investigated the migration pattern of 45 calcar-guided short stems in patients with ONFH, using Einzel-Bild-Roentgen-Analyse Femoral-Component-Analysis (EBRA-FCA). Influencing factors such as ARCO categories, age, gender, body weight and BMI were analyzed. Complications and adverse events were documented. Results At mid-term [48.1 months (SD 20.7 months)], mean axial migration was 1.56 mm (SD 1.77 mm). Mean migration rate stabilized after 2 years. No influence of ARCO categories, age and BMI was found. A tendency of increased axial migration was observed in male patients and in overweight patients. No revision surgeries had to be performed during follow-up. Conclusion The results indicate a migration pattern comparable to that of primary osteoarthritis patients with slight initial migration under full load followed by subsequent stabilization in the metaphyseal femur. The 100% survival rate at mid-term supports the usage of this short-stem design in patients with ONFH.

Stemless hip arthroplasty versus traditional implants: a comparative observational study at 30 months follow-up

2018 ◽  
Vol 28 (2_suppl) ◽  
pp. 21-27 ◽  
Author(s):  
Giandomenico Logroscino ◽  
Fabrizio Donati ◽  
Vincenzo Campana ◽  
Michela Saracco
Keyword(s):  
Short Form ◽  
Stress Shielding ◽  
Limb Length Discrepancy ◽  
Limb Length ◽  
Harris Hip Score ◽  
Retrospective Case ◽  
Chi Square ◽  
Length Discrepancy ◽  
Short Stems

Introduction: The aim of this retrospective case-control study is to evaluate clinical and radiographic results of short stems compared with traditional hip prostheses. Methods: 46 short stems (SS) and 50 traditional stems (TS) were selected. All the stems were implanted by the same surgeon using posterior approach because of primary osteoarthritis, post-traumatic osteoarthritis and avascular necrosis. All the patients were compared clinically by Harris Hip Score (HHS), Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), visual analogue scale (VAS), 12-item Short Form Health Survey (SF-12F/M) and radiographically (offset, CD angle, limb length discrepancy, cup inclination, subsidence, osseointegration, heterotopic ossification). Radiographic evaluations were carried out by 3 different blinded surgeons. A statistical analysis was performed (chi-square, t-test, Mann-Whitney). Results: At a mean follow-up of 30 months all the implanted stems were well-positioned and osseointegrated. In both groups there was a marked improvement in pain ( p < 0.001) with a statistically significant advantage in the SS group for WOMAC (90.8 vs. 87.5; p = 0.02) and in part for HHS (93 vs. 91.7; p = 0.18). The radiographic evaluations, with high concordance correlation between the 3 blinded surgeons (ICC consistently >0.80), showed no significant differences in the restoration of the articular geometry, with a reduction of cortical hypertrophy (2% SS vs. 7% TS) and periprosthetic stress-shielding ( p < 0.05) in the SS group. On the other hand, SS were more related to limb length discrepancy (61% vs. 33%; p < 0.05). No major complications were recorded in the 2 groups. Conclusion: Short stems were shown to be comparable or better than traditional implants at short-term follow-up.

scholarly journals Return to Sport Rates and Functional Outcomes Following Bilateral Hip Arthroscopy in High-Level Athletes

2020 ◽  
Vol 8 (7_suppl6) ◽  
pp. 2325967120S0043
Author(s):  
Benjamin Domb ◽  
Cynthia Kyin ◽  
Jacob Shapira ◽  
David Maldonado ◽  
Ajay Lall ◽  
...  
Keyword(s):  
Hip Arthroscopy ◽  
Patient Reported Outcomes ◽  
Return To Sport ◽  
Harris Hip Score ◽  
Complication Rates ◽  
Professional Athlete ◽  
Patient Reported ◽  
High Level ◽  
Modified Harris Hip Score

Objectives: To determine the rate of return to sport (RTS) in high-level athletes undergoing bilateral hip arthroscopy and report minimum 1-year patient-reported outcomes (PROs) for this cohort. We hypothesized that RTS rates, as well as sport-specific PROs, will be lower than the rates and scores previously reported in the literature for unilateral hip arthroscopy. Methods: Data were prospectively collected on all patients undergoing hip arthroscopy at our institution from November 2011 to July 2018. Patients were included if they underwent bilateral hip arthroscopy and were either a high school, collegiate, or professional athlete prior to their first surgery. RTS was defined as a patient’s return to competitive participation in their respective sport. Additional PROs, including modified Harris Hip Score (mHHS), nonarthritic hip score (NAHS), and Hip Outcome Score-Sports Specific Subscale (HOS-SSS), as well as complication rates and future surgeries were documented and compared for all patients. Results: A total of 87 patients met inclusion criteria, for which follow-up was available for 82 (94.3%). At latest follow-up, 44 (53.7%) patients returned to sport. Of patients returning, 56% did so at the same level or higher. The most common reasons for not returning to sport were due to graduation/lifestyle change (47.4%) and hip symptoms (44.7%). Patients returning to sport had significantly higher PROs at latest follow-up relative to those who did not return, including for mHHS (93.7 vs. 87.5), NAHS (94.4 vs. 88.2), HOS-SSS (90.9 vs. 78.2) (P < 0.05). Rates of achieving PASS and MCID for mHHS were not significantly different. However, for HOS-SSS, patients who returned had significantly higher rates of achieving the MCID and PASS. Conclusion: Rates of RTS after bilateral hip arthroscopy are lower than those after unilateral hip arthroscopy. When comparing patients that returned to sports and those who did not return, we show that although both groups show a significant improvement in PROs following surgery, those that returned to sport achieved significantly higher scores in all outcome measures. In addition, patients returning to sports showed a significantly higher rate of attaining MCID and PASS scores for the HOS-SSS, possibly attesting to the validity of this score and its thresholds.

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