HIP International最新文献

{"title":"Hip resurfacing: a narrative review of the past, present and future.","authors":"Joshua Filer, Richard P Baker","doi":"10.1177/11207000261467907","DOIUrl":"10.1177/11207000261467907","url":null,"abstract":"<p><p>Hip resurfacing arthroplasty (HRA) has a rich history of innovation. This review documents the changes in HRA, focusing on how the successes and failures of different historical design concepts and bearing materials have shaped current indications and patient selection. We also examine the evolution and development of modern prostheses.</p>","PeriodicalId":12911,"journal":{"name":"HIP International","volume":" ","pages":"672-678"},"PeriodicalIF":1.3,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148701198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Is there a place for routine use of cemented acetabular fixation in primary total hip arthroplasty for osteoarthritis? Equivalence demonstrated in an analysis of 96,574 cases from the Australian Orthopaedic Association National Joint Replacement Registry.","authors":"Richard J Hanly, Sarah L Whitehouse, Carl Holder, Richard de Steiger, Christopher J Wall, A John Timperley, Ross W Crawford, Dirk van Bavel","doi":"10.1177/11207000261430706","DOIUrl":"10.1177/11207000261430706","url":null,"abstract":"<p><strong>Introduction/aim: </strong>This study utilises Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR) data to compare survivorship of total hip arthroplasty (THA) with cemented and cementless acetabular fixation. To minimise confounders, only cases using cemented polished tapered stems with metal heads and highly cross-linked polyethylene (XLPE) liners for primary diagnosis of osteoarthritis were included.</p><p><strong>Methods: </strong>AOANJRR data were analysed from 01 September 1999 to 31 December 2022. The study population included all primary conventional THA performed for osteoarthritis using a cemented polished tapered stem with a bearing surface of metal head articulating with XLPE. These procedures were divided into two groups: procedures with either cemented or cementless acetabular fixation. The analyses were undertaken using Kaplan-Meier estimates of survivorship and hazard ratios (HR) from Cox proportional hazards models. Results were stratified by age and 3 surgeon volume groups: ⩽10, 10-25, and >25 procedures per surgeon per year.</p><p><strong>Results: </strong>There were 96,574 THAs performed for osteoarthritis using a cemented polished tapered stem included. Of these, 5,926 used cemented and 90,648 used cementless acetabular fixation. There was no difference in the rate of revision when cemented acetabular were compared to cementless acetabular procedures (HR 1.01; 95% CI, 0.86-1.18; <i>p</i> = 0.916). The most common reasons for revision surgery were similar for both fixation methods and included periprosthetic fracture, dislocation/instability and infection. There were no differences in the rate of revision when procedures were stratified by age or surgeon volume.</p><p><strong>Conclusions: </strong>For patients undergoing a primary THA for osteoarthritis there is no difference in the rate of revision between cemented or cementless acetabular fixation when utilising a cemented polished stem with modern bearing surfaces. The authors advocate the use of cemented acetabular fixation as a viable alternative and emphasise the need for continued teaching of the skills required to ensure the technique is not lost for future generations of orthopaedic surgeons.</p>","PeriodicalId":12911,"journal":{"name":"HIP International","volume":" ","pages":"723-737"},"PeriodicalIF":1.3,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13569904/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147645017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of pain, early functional recovery, and inpatient opioid consumption between direct anterior and posterior approach total hip arthroplasty.","authors":"Sophia S Antonioli, Alana Prinos, Mitchell F Kennedy, Akram Habibi, David Furgiuele, Joshua C Rozell, Ran Schwarzkopf","doi":"10.1177/11207000261438458","DOIUrl":"10.1177/11207000261438458","url":null,"abstract":"<p><strong>Introduction: </strong>Use of the direct anterior approach (DAA) in total hip arthroplasty (THA) has increased, with suggested benefits of faster recovery and less pain. However, consensus regarding the optimal approach is lacking. This study compared post-operative pain, functional recovery, and opioid use between DAA and posterior approach (PA) THA.</p><p><strong>Methods: </strong>We retrospectively reviewed 3618 primary THAs (DAA, <i>n</i> = 1809; PA, <i>n</i> = 1809) performed by fellowship-trained surgeons between 2019-2024. Cohorts were matched by age, sex, BMI, and CCI. Postoperative visual analogue scale (VAS) pain scores, Activity Measure for Post-Acute Care (AM-PAC) scores, and opioid consumption (morphine milligram equivalents, MME) were compared using independent <i>t</i>-tests.</p><p><strong>Results: </strong>Mean VAS pain scores were similar within the first 24 hours postoperatively. From 18 to 24 hours postoperatively, the PA cohort showed significantly higher VAS scores (4.32 [DAA] vs. 4.68 [PA], <i>p</i> = 0.006), although these differences are not clinically significant. Mean AM-PAC scores were significantly higher in the DAA cohort within 6 hours (22.3 [DAA] vs. 21.4 [PA], <i>p <</i> 0.001) and from 18 to 24 hours post-surgery (21.8 [DAA] vs. 20.1 [PA], <i>p <</i> 0.001), but these small differences do not reflect clinical significance. MME comparison showed a trend towards decreased opioid consumption within the DAA cohort, but the clinical relevance of these differences is unknown.</p><p><strong>Conclusions: </strong>Pain, function, and opioid use were largely comparable between DAA and PA, with minor statistical differences unlikely to be clinically meaningful.</p>","PeriodicalId":12911,"journal":{"name":"HIP International","volume":" ","pages":"697-704"},"PeriodicalIF":1.3,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147972150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The association between spinopelvic alignment and non-traumatic femoral head AVN: a case-control radiographic study.","authors":"Cemil Aktan, Yusuf Alper Katı, Zafer Ayhan, Akın Koşar, Muhammed Ergün, Ferhat Güler","doi":"10.1177/11207000261467890","DOIUrl":"10.1177/11207000261467890","url":null,"abstract":"<p><strong>Background: </strong>Non-traumatic avascular necrosis (AVN) of the femoral head is primarily attributed to vascular compromise; however, the potential role of spinopelvic alignment in its development remains insufficiently defined. This study aimed to evaluate whether sagittal spinopelvic parameters differ between patients with non-traumatic AVN and asymptomatic individuals.</p><p><strong>Methods: </strong>A retrospective case-control radiographic study was performed including 21 adults with bilateral Ficat-Arlet stage II-III non-traumatic AVN and 100 age- and sex-matched asymptomatic controls. Standardised standing full-length lateral radiographs were analysed to measure pelvic incidence (PI), pelvic tilt (PT), sacral slope (SS), lumbar lordosis (LL), thoracic kyphosis (TK), and sagittal vertical axis (SVA). Spinopelvic morphology was classified using the Roussouly and Barrey systems. Interobserver reliability was evaluated using intraclass correlation coefficients (ICC), and statistical significance was set at <i>p</i> < 0.05.</p><p><strong>Results: </strong>Patients with AVN demonstrated significantly lower PI, PT, SS, and LL values compared with controls (all <i>p</i> < 0.01), whereas TK did not differ significantly between groups. Although no statistically significant differences were observed in the distribution of Barrey and Roussouly types, a higher prevalence of Roussouly type 3 morphology was noted in the AVN cohort. Sex-related differences evident in the control group were not observed among AVN patients, and age showed minimal association with sagittal parameters. Inter-observer reliability was excellent for all measurements (ICC > 0.90).</p><p><strong>Conclusions: </strong>Patients with non-traumatic AVN exhibit a distinct spinopelvic alignment profile characterised by reduced PI-derived sagittal parameters and limited compensatory pelvic orientation. These findings indicate that altered lumbopelvic biomechanics may be associated with increased mechanical stress on the femoral head and may reflect a biomechanical profile linked to AVN susceptibility. Further prospective studies are warranted to clarify the clinical implications of this association.</p>","PeriodicalId":12911,"journal":{"name":"HIP International","volume":" ","pages":"679-686"},"PeriodicalIF":1.3,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148701131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tantalum metal cups and augments versus custom-made 3D-printed trabecular titanium implants for Paprosky 3A and 3B acetabular defects: mid-term results.","authors":"Agustin Albani-Forneris, Pablo Ariel Slullitel, Juan Ignacio Perez-Abdala, Nicolas Lucero Viviani, Carlos Lucero, Gerardo Zanotti, Fernando Comba, Martin Alejandro Buttaro","doi":"10.1177/11207000261424377","DOIUrl":"10.1177/11207000261424377","url":null,"abstract":"<p><strong>Methods: </strong>56 patients with severe acetabular bone defects with or without pelvic discontinuity were included. In the TCA group 31 patients and 25 in the 3D group with a minimum follow-up of 2 years were included. The main indication for revision surgery with acetabular bone defect was aseptic loosening in both groups.</p><p><strong>Results: </strong>The mean follow-up was 57.21 ± 28.81 months. Implant survival rates were 90.32% in the TCA group and 100% in the 3D (<i>P</i> = 0.24). Functional outcomes improved in both groups based on the Merle D'Aubigné & Postel score, with greater improvement in the 3D group (9.24 ± 3.23 vs. 6.55 ± 2.59 points, <i>P</i> = 0.001). Pain levels improved equally in both groups. Surgical time was shorter in the 3D group (108 ± 34.5 vs. 129 ± 43.4 minutes, <i>P</i> = 0.047).There were no significant differences in reoperation rate, transfusion need, hospital stay, or mortality.</p><p><strong>Conclusions: </strong>Tantalum metal cups and augments and custom-made 3D-printed trabecular titanium implants demonstrated an excellent survival rate in the management of severe acetabular bone defects. The group of patients operated on with custom 3D-printed implants had better postoperative functional outcomes and a shorter surgical time.</p>","PeriodicalId":12911,"journal":{"name":"HIP International","volume":" ","pages":"783-790"},"PeriodicalIF":1.3,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147389870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Direct superior approach versus posterior approach in patients with primary total hip arthroplasty: a systematic review and meta-analysis.","authors":"Mariany H Miyamoto, Marcos N Goularte, Ruan Pablo S Gomes, Giovana S Gaio, Gabriel Erzinger, Diego Lima","doi":"10.1177/11207000261422440","DOIUrl":"10.1177/11207000261422440","url":null,"abstract":"<p><strong>Objectives: </strong>The benefits and risks of the minimally invasive direct superior approach (DSA) compared with the posterior approach (PA) in primary total hip arthroplasty (THA) remain uncertain.</p><p><strong>Methods: </strong>We performed a systematic review and meta-analysis comparing DSA and PA in primary THA. Outcomes included perioperative parameters, radiological and functional results, and postoperative complications. Statistical analysis was performed using Review Manager, with heterogeneity assessed using I². Subgroup analyses were restricted to randomised controlled trials (RCTs).</p><p><strong>Results: </strong>11 studies comprising 5217 patients were included, with 1259 undergoing DSA. DSA was associated with a shorter hospital stay (MD -0.67 days; <i>p</i> < 0.00001), reduced blood loss (MD -66.09 mL; <i>p</i> = 0.007), and increased Harris Hip Scores (HHS) within 3 months (MD 1.00; <i>p</i> = 0.03). No significant differences were observed in operating time, radiological outcomes, Oxford Hip Score, Western Ontario and McMaster Universities Osteoarthritis Score, 12-month HHS, or postoperative complications. Subgroup analysis revealed differences between RCTs and observational studies in length of stay (<i>p</i> < 0.0004), leg-length discrepancy (<i>p</i> = 0.07), and operating time (<i>p</i> = 0.04).</p><p><strong>Conclusions: </strong>DSA appears to be a safe, effective alternative to PA, providing less blood loss, shorter hospitalisation, and faster early recovery without compromising mid-term outcomes.</p>","PeriodicalId":12911,"journal":{"name":"HIP International","volume":" ","pages":"713-722"},"PeriodicalIF":1.3,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147365017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The concept of a universal safe zone is history: a retrospective cohort study of 1520 total hip arthroplasties.","authors":"Mikko Pulkkanen, Rasmus Liukkonen, Perttu Neuvonen, Antti Eskelinen, Aleksi Reito","doi":"10.1177/11207000261422569","DOIUrl":"10.1177/11207000261422569","url":null,"abstract":"<p><strong>Introduction: </strong>Lewinnek safe zone has guided optimal acetabular cup positioning for decades. This study aimed to provide new data on dislocation rates after total hip arthroplasty (THA), assess the effects of cup positioning, and evaluate how well the event of dislocation can be predicted.</p><p><strong>Methods: </strong>A total of 1520 THAs performed at our hospital were included. The primary outcome was dislocation. Hips were divided into 20° × 20° areas with 5° intervals based on positioning, and crude dislocation rates were compared. Logistic regression models were used and the results reported using odds ratios with 95% confidence intervals. Predictive performances were assessed with R² and C-indexesResults:59 dislocations (48 posterior, 11 anterior) occurred, giving a dislocation rate of 3.9%. Neither a universal nor component-specific safe zone could be created. Cup brand was the most significant factor. Overall predicative values were 0.041-0.134 with R² values and 0.665-0.775 with C-index values.</p><p><strong>Conclusions: </strong>Dislocation after THA cannot be explained by cup positioning alone. Risk profiles differ between acetabular cup systems, and even though cup design emerged as a key factor, its explanatory power remained modest. These findings emphasize the multifactorial nature of dislocation and the limitations of universal safe zones.</p>","PeriodicalId":12911,"journal":{"name":"HIP International","volume":" ","pages":"766-774"},"PeriodicalIF":1.3,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147365015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"1-year patient-reported outcomes in patients with a documented GLP-1 agonist prescription history prior to total hip arthroplasty: a retrospective cohort study.","authors":"Brian Benyamini, Shujaa T Khan, Khaled A Elmenawi, Shlok V Patel, Matthew E Deren, Nicolas S Piuzzi","doi":"10.1177/11207000261450078","DOIUrl":"10.1177/11207000261450078","url":null,"abstract":"<p><strong>Aims: </strong>Glucagon-like peptide-1 (GLP-1) receptor agonists are increasingly utilised for metabolic optimisation in surgical patients. Their effect on postoperative patient-reported outcomes (PROMs) and satisfaction following primary total hip arthroplasty (THA) has not been well established. This study aimed to describe the association between GLP-1 prescription history and: (1) 1-year postoperative PROMs; (2) 1-year patient satisfaction; and (3) complication rates.</p><p><strong>Methods: </strong>This is a retrospective study of 12,749 patients who underwent primary unliteral THA at a tertiary medical centre from January 2016 to December 2022. GLP-1 agonist use was defined as a documented prescription history of a GLP-1 agonist within 1-year prior to surgery (<i>n</i> = 145). Multivariable logistic regression was used to evaluate GLP-1 use and 1-year PROMs [Hip disability and Osteoarthritis Outcome Score (HOOS) Pain, Physical function Shortform (PS), and Joint Replacement (JR)]. Clinical improvements were determined by the patient acceptable symptom state (PASS) and minimal clinically importance difference (MCID) thresholds. We also used multivariable logistic regression to assess the independent association between GLP-1 use and postoperative complications.</p><p><strong>Results: </strong>No significant difference was observed between patients with a prescription history for a GLP-1 agonist and failure to achieve PASS, MCID, or satisfaction at 1-year (odds ratio [OR] 0.99, 95% confidence interval [CI], 0.51-1.9; <i>p</i> = 0.98). However, there was reduced odds of 90-day readmission in patients with a prescription history for a GLP-1 agonist (OR = 0.47, <i>p</i> = 0.043) and an increased rate of 90-day medical complications (9.66% vs. 6.01%, <i>p</i> = 0.001). No significant differences were found for length-of-stay, 90-day emergency visits, or 2-year implant complication rates.</p><p><strong>Conclusions: </strong>This observational study found that patients with GLP-1 agonist prescription history experienced an increased rate of medical complications but a reduced rate of 90-day hospital readmission. Conversely, the negative findings of the study should be interpreted cautiously as the small, exposed cohort limits statistical power.</p>","PeriodicalId":12911,"journal":{"name":"HIP International","volume":" ","pages":"791-798"},"PeriodicalIF":1.3,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148217621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"1-year outcomes of robotic-assisted, computer-assisted, and manual total hip arthroplasty after the learning curve.","authors":"Periklis Giannakis, Jashvant Poeran, Juliet E Rowe, Sophia T Zhuang, Crispiana Cozowicz, Jiabin Liu, Stavros G Memtsoudis, Alexander S McLawhorn, Robert G Marx, Alejandro Gonzalez Della Valle, Lazaros Poultsides","doi":"10.1177/11207000261438113","DOIUrl":"10.1177/11207000261438113","url":null,"abstract":"<p><strong>Introduction: </strong>While comparisons exist between manual (MA-THA), computer-assisted (CA-THA), and robotic-assisted total hip arthroplasty (RA-THA), they have not considered surgeon/hospital learning curves. Therefore, we compared surgical outcomes between MA-THA/CA-THA/RA-THA among hospitals with ⩾1 year of RA-THA experience.</p><p><strong>Methods: </strong>In this retrospective study (2016-2023, Premier Healthcare Database), we included adults undergoing elective MA-THA/CA-THA/RA-THA for non-traumatic/non-neoplastic diagnoses. Our primary outcome was any mechanical complication within 1-year follow-up; secondary outcomes included any infection within 1 year. We conducted pairwise mixed-effects logistic regression and reported odds ratios (OR) and 95% confidence intervals (CI).</p><p><strong>Results: </strong>Among 75,966 MA-THAs, 6,207 CA-THAs and 17,497 RA-THAs, odds of any mechanical complication within 1-year were: CA-THA versus MA-THA (OR 0.63, CI 0.52-0.75; <i>p</i> < 0.001), RA-THA versus MA-THA (OR 0.81, CI 0.73-0.90; <i>p</i> < 0.001) and RA-THA versus CA-THA (OR 1.44, CI 1.14-1.82; <i>p</i> = 0.003). Differences between RA-THA and CA-THA were primarily due to higher odds of mechanical loosening (OR 2.40, CI 1.19-4.85; <i>p</i> = 0.015) with RA-THA. Dislocation was less likely with RA-THA compared to MA-THA (OR 0.57, CI 0.44-0.72; <i>p</i> < 0.001). CA-THA (OR 0.46 CI 0.34-0.63; <i>p</i> < 0.001) and RA-THA (OR 0.83 CI 0.71-0.97; <i>p</i> = 0.022) were associated with significantly lower odds of infection within 1 year compared to MA-THA. RA-THA was associated with higher odds of infection within 1 year compared to CA-THA (OR 2.11 CI 1.43-3.09; <i>p</i> < 0.001).</p><p><strong>Conclusions: </strong>With up to 1-year follow-up, CA-THA was associated with the lowest odds for mechanical complications, primarily due to mechanical loosening and infection.</p>","PeriodicalId":12911,"journal":{"name":"HIP International","volume":" ","pages":"687-696"},"PeriodicalIF":1.3,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147837153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A 3-dimensional MRI analysis of the <i>in vivo</i> femoral head centre translation in multiple static hip joint positions in subjects with femoroacetabular impingement.","authors":"Dominic Bachmann, Lukas Beringer, Igor Komnik, Günther Schneider, Diana Hell, Oliver Steimer, Karen Aus der Fünten, Wolfgang Potthast","doi":"10.1177/11207000261445612","DOIUrl":"10.1177/11207000261445612","url":null,"abstract":"<p><strong>Background: </strong>Recent research questions the view of the hip joint as a ball-and-socket joint, yet many studies still use this model to quantify hip joint kinematics. This paper challenges that assumption and proposes a coupling mechanism between hip rotation and femoral head translation.</p><p><strong>Methods: </strong>5 elite badminton players, all affected by femoroacetabular impingement, underwent MRI of the hip joint in 7 predefined positions per side. A model registration approach was used to quantify the hip joint rotation and femoral head translation of the femoral head in each condition.</p><p><strong>Results: </strong>1 significant coupling mechanism was detected, hip flexion leads to an anterior translation of the femoral head centre of 0.024 mm per degree flexion (induvial R²: 0.72-0.91, conditional R²: 0.58, <i>p</i> < 0.05). No significant couplings of other hip joint rotations and femoral head centre translation were detected.</p><p><strong>Conclusions: </strong>The findings emphasise the importance of incorporating femoral head centre translation, based on hip flexion angles, into biomechanical models and surgical simulations for femoroacetabular impingement patients to enhance the accuracy of simulation results.</p>","PeriodicalId":12911,"journal":{"name":"HIP International","volume":" ","pages":"834-841"},"PeriodicalIF":1.3,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147987241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}