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Open research questions in Orthopaedic implants and arthroplasty

29 unresolved questions extracted from the limitations and future-work sections of 359 Orthopaedic implants and arthroplasty papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • management decisions remains unclear. Fourth, This work was supported by a grant from the Clinical the follow-up duration varied widely across the included Medicine Research Institute of the Chosun University Hos- studies, and the long-term clinical significance of capsular pital (2024).

    Capsular management in hip arthroscopy · 2026 · DOI

  • To date, acetabular cup position results have not been directly compared between these approaches (Table 4). 16 This discrepancy between our results and previous findings, including studies that do not in report differences statistically significant radiographic outcomes,8,28,29,31,33,35-37 may be attributed to the lack of standardization in anteversion evaluation techniques.

    Direct anterior versus small incision lateral approach in total hip arthroplasty: postoperative radiological and complication rate differences · 2026 · DOI

  • Moreover, even among studies that dichotomize measurements using Lewinnek’s safe zone criteria, there is no standardized method for assessing com- ponent position14,15,28,29,34,36 measurement techniques 589 Zamora-Muñoz PM et al.

    Direct anterior versus small incision lateral approach in total hip arthroplasty: postoperative radiological and complication rate differences · 2026 · DOI

  • Study Limitations This study was conducted among patients undergoing hip replacement surgery at the orthopaedics and traumatology clinic of a training and research hospital in Türkiye; therefore, the findings cannot be generalized to other surgical populations. Future studies using multivariable analytical approaches are warranted to better clarify the independent contribution of preoperative care dependency to postoperative comfort.

    The Relationship Between Preoperative Care Dependence and Postoperative Comfort Level in Patients with Hip Replacement · 2026 · DOI

  • ith musculoskeletal disorders is currently limited to the assessment of major periarticular hip muscles. Therefore, the generalizability of our results to male patients or to individuals with other hip disorders remains uncertain. Future studies incorporating larger and more diverse cohorts, including male patients and indi- viduals with various musculoskeletal disorders, as well as function-oriented outcome measures, are warranted to further refine and validate the algorithm, improve its generalizability, and better define the clinical utility of CT-based muscle assessment in guiding patient-specific rehabilitation strategies.

    Accuracy of automated segmentation of gluteus and paraspinal muscles in patients with hip osteoarthritis using TotalSegmentator in 3Dslicer · 2026 · DOI

  • Given the limited number of scientific studies directly comparing the outcomes of surgery using direct anterior access versus posterior access, this scoping review is based on a limited number of publications. The greatest difficulty in gathering information for this study was finding publications that directly compared DAA with PA. Due to the wide variety of approaches in hip arthroplasty, there are many publications comparing the outcomes of surgeries using different approaches; however, we considered it inappropriate to include publications that do not directly compare the outcomes of the two approaches being compared.

    Direct Anterior Versus Posterior Approach in Total Hip Arthroplasty: A Literature Review Comparing Outcomes, Functional Recovery, and Return to Sports · 2026 · DOI

  • The work presented herein addresses the gap in understanding about what happens in a laboratory environment versus what is happening in human patients that results in metal leaching into tissues as well as a shortened lifespan of a spine rod in a patient population that is not capable of breaking these spine rods from purely mechanical means.

    Microbial Influenced Corrosion: A Novel Initiator of In Vivo Spine Rod Fracture · 2026 · DOI

  • At seven years, SS grade distribution was significantly lower in the TNS group than in Ti-6Al-4V controls, with SS frequency reduced in Gruen Zones 2, 3, and 6, and no stem-related failures; however, third-degree SS was still observed in 11 of 34 evaluable cases (32%), indicating that modulus-gradient optimization alone is insufficient to fully prevent SS.

    Reducing Stress Shielding in Cementless Total Hip Arthroplasty: A Translational Review of the Gradient-Modulus Ti-Nb-Sn Femoral Stem · 2026 · DOI

  • Purpose Third-generation alumina is being replaced with fourth-generation alumina matrix composite (AMC) in ceramicon-ceramic total hip arthroplasty (THA), however, comparative clinical studies at a long-term are lacking.

    Third- and fourth- generation ceramic-on-ceramic total hip arthroplasty: a ten- to sixteen year follow-up study · 2026 · DOI

  • Although the regression model identified age, sex, and etiology as significant predictors of acetabular cup size, the adjusted R2 of 0.30 indicates that a substantial proportion of variability remains unexplained. Important anthropometric and anatomical variables such as height, weight, body mass index, and pelvic morphometric parameters were not uniformly available across participating registry datasets and, therefore, could not be incorporated into the current analysis. Their omission may have introduced residual confounding and likely limited the explanatory power of the model. Future prospective studies with standardized anthropometric and radiographic data collection are warranted to refine prediction of population-specific acetabular component sizing. Furthermore, our study did not include long-term clinical outcomes following the use of jumbo cups, which could provide further insight into the durability and success of these implants over time. The strengths of this study include its large sample size of 2,372 patients, drawn from multiple high-volume centers, enhancing the generalizability of our findings across diverse patient populations. This multicentre approach allows us to account for regional variations and ensures robust data collection. Additionally, this study fills a critical gap in the literature by providing specific data on acetabular cup sizes for Indian patients, supporting the development of population-specific guidelines. However, this study also has some limitations. As a retrospective analysis, it is limited by the quality of data available in institutional registries, and variations in surgical technique across centers may influence component selection.

    Jumbo Acetabular Cup in the Indian Population: Is It Time to Reconsider Existing Thresholds? · 2026 · DOI

  • In the long-term, prospective studies are warranted to determine which surgical approach yields superior outcomes across these key metrics. Authors’ contributions: SWF: Conceptualized, performed formal analysis, conducted research, and wrote the final and initial draft; CJD: Conceptualized, conducted research, provided resources, oversight, and wrote the final and initial draft. All authors have critically reviewed and approved the final draft and are responsible for the manuscript’s content and similarity index. Ethical approval: The research/study was approved by the Institutional Review Board at the University of Rochester Department of Human Subjects Protection, number STUDY00010189, dated February 26, 2025. Declaration of patient consent: The authors certify that they have obtained all appropriate patient consent forms. In the form, the patient has given consent for clinical information to be reported in the journal. The patient understands that the patient’s names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.

    Comparison of direct anterior and posterior approaches in total hip arthroplasty within a mature surgical practice: A single surgeon analysis of complications and perioperative metrics · 2026 · DOI

  • This study has several limitations inherent to its retrospec- tive design. First, our assessment of intraoperative details, such as the exact degree of residual stem fixation to isolated bone fragments prior to extraction, was limited to the spe- cific details described in the operative notes. Furthermore, while we qualitatively categorized the gross fracture mor- phologies, the lack of a standardized classification system for periprosthetic fracture patterns remains a potentially confounding factor. The specific anatomical complexity and 1 3Archives of Orthopaedic and Trauma Surgery (2026) 146:209 209 Page 8 of 9 pattern of each fracture may have influenced the selected surgical sequence, stem modularity, and use of additional hardware. Future research on this topic should investigate whether PPFF pattern is associated with varying clinical outcomes investigated in the current study. Additionally, when considering subsidence measurements on radio- graphs, despite an ICC of 97% and additional calculations to account for radiographic magnification, inaccuracies in measurements could exist. Lastly, the relatively small sam- ple size in this study may have limited the ability to find statistically significant results.

    Does the order matter? Comparing the order of stem placement and fracture reduction in revision total hip arthroplasty for Vancouver B2 and B3 periprosthetic femur fractures · 2026 · DOI

  • Currently, clear clinical guidelines regarding the timing of elective orthopedic surgeries relative to the menstrual cycle are lacking, often leading to unnecessary surgical rescheduling.

    Hip Arthroscopy During Female Menstruation: A Retrospective Analysis of Safety and Clinical Outcomes With 24‐Month Follow‐Up · 2026 · DOI

  • Although hip-preserving strategies have expanded markedly, management remains heterogeneous and a universally accepted, stage-stratified algorithm is lacking.

    Innovations and future research directions on hip preservation management options for osteonecrosis of the femoral head · 2026 · DOI

  • Future research should focus on refining prognostic algorithms, potentially incorporating advanced imaging biomarkers and patient-specific factors, to further optimize treatment selection.

    Rethinking preservation – the case for timely hip arthroplasty in young adult hip pathology · 2026 · DOI

  • Further research on the return to fitness enabling participation in sports activities may prove particularly valuable in the context of changes in patient demographics [5-7].

    Direct Anterior Versus Posterior Approach in Total Hip Arthroplasty: A Literature Review Comparing Outcomes, Functional Recovery, and Return to Sports · 2026 · DOI

  • However, this finding has not been widely replicated, and its accuracy in the supine position without assistive devices remains poorly characterized.

    A novel pinless augmented reality-based navigation system for total hip arthroplasty in the supine position: a comparative study of acetabular cup angle accuracy · 2026 · DOI

  • Lateralized (offset) acetabular liners were developed to increase global offset and improve soft-tissue tension, but their effect on implant fixation and revision risk remains uncertain.

    Impact of offset polyethylene liners on acetabular component loosening · 2026 · DOI

  • Background: Little is known regarding the circulating metal levels in patients following total ankle arthroplasty (TAA).

    Serum Titanium Following Total Ankle Arthroplasty · 2026 · DOI

  • Residual soft-tissue constraints after infection may continue to influence operative complexity and early outcomes, but the mechanisms and predictive factors remain unclear.

    AI-assisted 3D preoperative planning in primary total hip arthroplasty for secondary hip osteoarthritis: etiology-specific perioperative burden and early recovery in DDH versus post-septic sequelae · 2026 · DOI

  • Potentially influential variables were not quantified in a standardized manner, including the extent of scarring/contracture, prior hip procedures, abductor status, and pathogen-related factors in the post-septic cohort.

    AI-assisted 3D preoperative planning in primary total hip arthroplasty for secondary hip osteoarthritis: etiology-specific perioperative burden and early recovery in DDH versus post-septic sequelae · 2026 · DOI

  • The long inclusion period may introduce temporal bias, and no formal early-versus-late comparison was performed to quantify potential learning-curve effects.

    AI-assisted 3D preoperative planning in primary total hip arthroplasty for secondary hip osteoarthritis: etiology-specific perioperative burden and early recovery in DDH versus post-septic sequelae · 2026 · DOI

  • Discussion: No studies were found in the literature assessing the survival of hip preserving surgery according to persistence or elimination of known risk factors for osteonecrosis.

    Hip preserving surgery for avascular hip necrosis: does terminating exposure to known risk factors improve survival? · 2020 · DOI

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29 open questions have been extracted from the limitations and future-work passages of 359 Orthopaedic implants and arthroplasty 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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