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Open research questions in Hip disorders and treatments

48 unresolved questions extracted from the limitations and future-work sections of 302 Hip disorders and treatments papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • There is a lack of long-term follow-up data on femoral derotational osteotomy for excessive femoral anteversion or retroversion. The effectiveness of the procedure in treating excessive femoral anteversion or retroversion is not well established.

    Femoral derotational osteotomies for version abnormalities: a mean ten-year follow-up · 2026 · DOI

  • Femoral nerve palsy is a potential complication of brace treatment for children with developmental dysplasia of the hip. The condition can have significant consequences for the child's quality of life. There is a need for effective strategies to prevent femoral nerve palsy in children with developmental dysplasia of the hip.

    Femoral nerve palsy in brace treatment for developmental dysplasia of the hip · 2026 · DOI

  • The study faced challenges in terms of small sample size and limited follow-up duration. The study had to account for various confounding factors, such as preoperative pain and hip disability. The study had to develop effective methods to classify pre- and postoperative physical workload.

    Return to work after periacetabular osteotomy: workload as a determinant of occupational trajectories · 2026 · DOI

  • There is a lack of evidence on occupational outcomes after periacetabular osteotomy. Previous studies have focused on return to sports, but not return to work. There is a need to investigate the impact of periacetabular osteotomy on career choice in students.

    Return to work after periacetabular osteotomy: workload as a determinant of occupational trajectories · 2026 · DOI

  • The lack of a single objective diagnostic standard for hip microinstability. The variability in diagnostic features across studies. The limited available clinical evidence.

    Traction arthrography for quantitative assessment of hip distractibility in early hip disorders · 2026 · DOI

  • Achieving a stable and concentric reduction of the femoral head within the acetabulum. Predicting treatment failure and the need for secondary surgery. Managing avascular necrosis and other complications.

    Intraoperative Hip Arthrography During Closed Reduction for Developmental Dysplasia of the Hip in Infants: A Comparative Study of Surgical Decision-Making and Secondary Intervention Risk · 2026 · DOI

  • The study notes that changes in coding, data sources, or screening policy may contribute to the heterogeneity in the prevalence of congenital hip dislocation. Underascertainment of cases may also be a challenge in some registries. The study highlights the need for more effective screening policies and treatment guidelines for congenital hip dislocation.

    Heterogeneity of the prevalence of congenital hip dislocation in Europe · 2026 · DOI

  • The aetiology of Perthes' disease is unknown. There is a lack of data on the incidence of the disease in certain areas, such as Liverpool.

    Perthes' disease of the hip in Liverpool. · 1983 · DOI

  • However, a grafting procedure is warranted in many cases to help restore bone stock for future revisions.

    Giveback Bargaining: One Answer to Current Labor Problems?. · 1983 · DOI

  • Limitations should be considered when interpreting and applying the results of this study. First, this study had a relatively small sample size of 43, putting our data analysis at an elevated risk for encountering type II errors. Second, this study is limited to a short-term minimum follow-up for inclusion of 1 year; however, the goal of this study was to present available initial outcome data. Third, variation between cohorts existed regarding rehabilitation and restriction protocols, possibly resulting in unquantifiable variations in patient-reported outcomes. Fourth, patients in the ALR alone cohort were significantly older than those who received FHOCA transplantation with or without ALR. Fifth, we were unable to determine whether all patients met MCIDs from pre-operative to FFU timepoints, largely because several patients did not provide complete pre-operative PROMs data.

    Initial Outcomes Following Femoral Head Osteochondral Allograft and Meniscus Allograft Labral Reconstruction: A Prospective Cohort Study · 2026 · DOI

  • include the small number of studies per outcome and substantial heterogeneity for several analyses. Defnitions of early compared with late experience varied widely (chronological cutofs vs CUSUM analyses), and reporting of key variables, particularly postoperative patient-reported outcome measures (PROMs), was inconsistent. Most included studies were retrospective and subject to selection and reporting bias. Radiological correction is a major limitation of this analysis, as defnitions varied substantially across studies, limiting the validity and interpretability of the pooled estimate, which should therefore be interpreted with caution. The moderate to limits causal serious risk of bias interpretation, as residual confounding, non-random case selection, and non-standardized classifcation of experience phases may distort observed learning-curve efects. Finally, limited, and some non-signifcant statistical power was pooled estimates may refect insufcient sample size rather than absence of true diferences.

    Learning curve in periacetabular osteotomy for developmental dysplasia of the hip · 2026 · DOI

  • Future research should prioritize prospective multicentre registries with standardized defnitions of early and late training phases, consistent radiological and clinical outcome reporting, and inclusion of surgeon-level covariates such as fellowship training, annual volume, and supervision struc- ture. Integration of cumulative summation (CUSUM) and risk-adjusted models may provide more precise benchmarks for profciency thresholds in PAO. Long-term PROMs and survivorship analyses across the learning curve remain largely unexplored and should be addressed in future work. In conclusion, this systematic review and meta-analy- sis demonstrates that operative efciency in periacetabular osteotomy improves with increasing surgeon experience, with consistently shorter operating times observed in late cases. In contrast, diferences in blood loss, complications, and radiological outcomes between early and late cases were not statistically signifcant. While heterogeneity and methodolog- ical variability should be considered, the fndings suggest that learning-curve efects in PAO primarily manifest through improved operative efciency.

    Learning curve in periacetabular osteotomy for developmental dysplasia of the hip · 2026 · DOI

  • The optimal treatment strategy for DDH in children aged 1-4 years is controversial. There is a lack of studies evaluating the impact of open reduction on outcomes in this age group. The study aims to address this gap by investigating the effectiveness of open reduction.

    Surgical alternatives for treatment of developmental dysplasia of the hip in children aged 1–4 years: does open reduction improve the outcomes? · 2026 · DOI

  • Access to data is limited to the FEMORAL NERVE PALSY IN BRACE TREATMENT FOR DEVELOPMENTAL DYSPLASIA OF THE HIP 846 researchers who have obtained permission for data processing.

    Femoral nerve palsy in brace treatment for developmental dysplasia of the hip · 2026 · DOI

  • The study uses a rabbit model, which may not directly translate to human DDH. The sample size is limited to 40 rabbits. The study only investigates the short-term effects of OPG on acetabular dysplasia.

    Autologous osteoperiosteal graft shows superior outcomes to bone graft in shelf acetabuloplasty for acetabular dysplasia · 2026 · DOI

  • Investigating the long-term effects of OPG on acetabular dysplasia. Comparing the outcomes of OPG with other treatment options for DDH. Translating the findings to human DDH patients.

    Autologous osteoperiosteal graft shows superior outcomes to bone graft in shelf acetabuloplasty for acetabular dysplasia · 2026 · DOI

  • There is a lack of a single objective diagnostic standard for hip microinstability. Current criteria rely on combinations of history, physical examination, imaging, and intraoperative findings.

    Traction arthrography for quantitative assessment of hip distractibility in early hip disorders · 2026 · DOI

  • The limitations of this study include its retrospective lack of randomization, which may design and introduce selection bias; potential variability in surgical decision thresholds related to individual surgeon practice; and the possible clustering effect resulting from the analysis of bilateral hips as independent observations.

    Intraoperative Hip Arthrography During Closed Reduction for Developmental Dysplasia of the Hip in Infants: A Comparative Study of Surgical Decision-Making and Secondary Intervention Risk · 2026 · DOI

  • The study is limited by the heterogeneity in graft types, surgical techniques, and outcome reporting. The study is also limited by the lack of randomized controlled trials.

    Outcomes of Arthroscopic Hip Labral Reconstruction Using Allograft Versus Autograft Tissue for Chronic Labral Tears: A Systematic Review · 2026 · DOI

  • The optimal graft selection for arthroscopic labral reconstruction remains controversial. There is a lack of high-quality evidence comparing the outcomes of allograft and autograft tissue.

    Outcomes of Arthroscopic Hip Labral Reconstruction Using Allograft Versus Autograft Tissue for Chronic Labral Tears: A Systematic Review · 2026 · DOI

  • Purpose The role of periacetabular osteotomy (PAO) in symptomatic borderline hip dysplasia (borderline HD) remains controversial because the lateral centre-edge angle may not reect global dysplastic morphology.

    Morphological features and long-term outcomes after periacetabular osteotomy for borderline hip dysplasia · 2026 · DOI

  • There is a need for further research to fully elucidate the benefits and limitations of hip arthroscopy for managing persistent pain after total hip arthroplasty. Emerging indications for hip arthroscopy, such as loose body removal and management of prosthetic joint infection, require further investigation.

    Hip Arthroscopy After Total Hip Arthroplasty: A Current Review of Indications, Techniques, and Outcomes · 2026 · DOI

  • The importance of capsular closure in hip arthroscopy for FAI has recently gained attention, but its effectiveness is not well established.

    Clinical outcomes of capsular repair versus non-repair after hip arthroscopy for femoroacetabular impingement: a meta-analysis · 2026 · DOI

  • Although the frequency of DDH among CMT patients has been under-investigated, the musculoskeletal complications of CMT (including weakness and abnormal gait) may predispose individuals to hip dysplasia.

    The Association Between Charcot-Marie-Tooth Disease and Developmental Dysplasia of the Hip: A Narrative Review · 2026 · DOI

  • The study identifies a gap in the understanding of the heterogeneity of the prevalence of congenital hip dislocation in Europe. The study notes that the data from the EUROCAT registries are extremely heterogeneous, which may limit the interpretation of the results.

    Heterogeneity of the prevalence of congenital hip dislocation in Europe · 2026 · DOI

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48 open questions have been extracted from the limitations and future-work passages of 302 Hip disorders and treatments papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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