Hip
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Purpose
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Up to 90% of nonambulatory patients with cerebral palsy (CP) experience hip displacement during their lifetime. Reconstructive surgery is recommended. Redisplacement rate is an outcome parameter.
Methods
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In a systematic literature review (MEDLINE, Embase and CENTRAL databases) until January 2023 we searched for reports with redisplacement rates after bony hip reconstructive surgery in nonambulatory patients. Quantitative data synthesis, subgroup analysis and meta-regression with moderators were carried out.
Results
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The pooled mean redisplacement rate was 16% (95% CI: 12–21%) with a prediction interval of 3–51% (Q: 149; df: 32; P < 0.001; I 2: 78%; τ 2: 0.67 and τ: 0.82) in 28 studies (1540 hips). Varus derotation osteotomy (VDRO) alone showed a higher redisplacement rate than VDRO + pelvic osteotomy (30% vs 12%, P < .0001). Mean age in the VDRO-alone subgroup was 7.1 years and in the combined group 9.5 years (P = .004). In meta-regression, lower redisplacement rates were observed with higher preoperative migration index (MI) (correlation coefficient: −0.0279; P = .0137), where comprehensive surgery was performed. Variance in true effects are explained by type of bone surgery (57%), preoperative MI (11%), age (5%) and MI for definition of failure (20%). No significant reduction in the redisplacement rate could be observed over the mid-years of studies (1977-2015).
Conclusion
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Our pooled data support the more extensive surgical approach in patients with high preoperative MI and emphasize the superiority of combined surgery. Studies should report a coordinated set of parameters and outcome classifications according to internationally accepted gradings to reduce redisplacement in future.
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Purpose
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The aim of this study was to evaluate the development of the worldwide survival rate of primary total hip arthroplasty (THA). The hypothesis was that survival improved over the last decade in worldwide arthroplasty registers.
Methods
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THA registers were screened in 2022 and compared between different countries with respect to the number of primary implantations per inhabitant, age, fixation type, and survival rate, and compared to similar data from 2009. The data from these reports were analyzed in terms of number, age distribution, and procedure type of primary THAs. Survival curves and a comparative analysis with respect to the development over time were calculated.
Results
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We identified nine hip arthroplasty registers that contained sufficient data to be included. A large variation was found in the annual number of primary THA implantations per inhabitant, with more than the factor 4 for all age groups across regions. The procedure type varied strongly as well, e.g. in Sweden, 50% were cemented THAs, whereas in Emilia-Romagna (Italy), 96% of THAs were implanted cementless. We found an improved survival rate of 5%, with 90% of survival after 15 years in the cohorts from 2021 compared to 85% in the cohorts from 2009.
Conclusion
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The present study revealed a significant improvement in the survival of THA in worldwide arthroplasty registers within different countries and regions over the period of one decade. We believe that it is safe to state that the success of THA is still rising with respect to this main outcome.
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Orthopedics, Faculty of Medicine, Department of Clinical Sciences, Lund University, Malmö, Sweden
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BG Kliniken – Klinikverbund der gesetzlichen Unfallversicherung gGmbH, Berlin, Germany
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Purpose
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To assess utility, benefits, and risks of 4th-generation alumina–zirconia ceramic pairings in elective total hip arthroplasty (THA).
Methods
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A comprehensive mixed-methods best-evidence synthesis using data from systematic reviews, randomized controlled trials (RCTs), prospective and retrospective cohort studies, as well as joint replacement registries, was conducted to estimate overall revision and survival rates, periprosthetic infection, bearing fractures, and noise phenomena with 4th-generation alumina–zirconia ceramic versus other tribological couplings in elective THA. The systematic review part across multiple databases was registered with PROSPERO (CRD42023418076), and individual study data were extracted for statistical re-analysis.
Results
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Twenty overlapping systematic reviews, 7, 17, and 8 references from RCTs, cohort studies, and joint replacement registries form the basis of this work. According to current best evidence, it is (i) 15–33 times more likely that 4th-generation alumina–zirconia pairings avoid a revision for infection than causing a revision for audible noise, (ii) 38–85 times more likely that 4th-generation alumina–zirconia pairings avoid a revision for infection than causing a revision for ceramic head fractures, and (iii) three to six times more likely that 4th-generation alumina–zirconia pairings avoid a revision for infection than cause a revision for ceramic liner fractures.
Conclusion
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Fourth-generation alumina–zirconia pairings in THA show a favorable benefit–risk ratio, with rare compound-specific adverse events and complications significantly outbalanced by long-term advantages, such as a markedly lower incidence of revision for infection.
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Acetabular revision arthroplasty, a demanding field of reconstructive hip surgery, calls for innovative strategies to deal with challenging bone defects and implant failure seen in revision cases.
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Conventional implant solutions might fall short of adequately addressing severe bone loss and ensuring stable fixation, highlighting the necessity of customized strategies.
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Personalized megaimplants, distinguished by their tailor-made design and large-scale construction, present a viable option to overcome these challenges.
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The present article provides an elaborate analysis of custom-made megaimplants in acetabular revision arthroplasty, shedding light on the underlying principles, design complexities, manufacturing methods, applications in the clinical setting, and outcome assessment.
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The aim of this review is to present a comprehensive insight into personalized megaimplants and their contribution to the advancement of orthopedic surgery.
Artro Institute, 8, rue du Pont de Thé, Annecy Le Vieux, France
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Artro Institute, 8, rue du Pont de Thé, Annecy Le Vieux, France
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Purpose
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to systematically review comparative studies reporting revision rates, clinical outcomes, or radiographic outcomes of total hip arthroplasty (THA) using collared versus collarless conventional-length uncemented hydroxyapatite (HA)-coated stems.
Methods
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In adherence with PRISMA guidelines, a literature search was performed on Medline, Embase, and Scopus. Comparative clinical studies were eligible if they reported outcomes of collared versus collarless uncemented HA-coated stems for primary THA. Two reviewers screened titles, abstracts, and full-texts to determine eligibility; then performed data extraction; and assessed the quality of studies according to Joanna Briggs Institute (JBI) checklist.
Results
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The search returned 972 records, 486 were duplicates, and 479 were excluded after title/abstract/full-text screening. Three further studies were included from the references of eligible studies and from discussions with subject matter experts, resulting in 11 included studies. The JBI checklist indicated six studies scored ≥7 points and four studies ≥4 points. Pooled data revealed collared stems had significantly lower revision rates (OR = 0.45; 95% CI = 0.31–0.64) and subsidence (MD = −1 mm; 95% CI = −1.6–-0.3), but no significant difference in intraoperative complication rates (OR = 0.94; 95% CI = 0.67–1.32) in the short term to mid-term. Unpooled data indicated that collared stems provide equivalent survival, equivalent or better outcomes, and equivalent or lower complication rates.
Conclusion
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In comparative studies, collared stems have lower revision rates than collarless stems, as well as equivalent or better clinical and radiographic outcomes. Differences could be due to a protective effect that the collar offers against subsidence, particularly in undersized or misaligned stems. Further studies are warranted to confirm long-term results and better understand differences between registry data and clinical studies.
IRCCS Humanitas Research Hospital, Via Manzoni 56, Rozzano, Milan, Italy
Fondazione Livio Sciutto Onlus, Campus Savona - Università degli Studi di Genova, Via Magliotto 2, Savona, Italy
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IRCCS Humanitas Research Hospital, Via Manzoni 56, Rozzano, Milan, Italy
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Fondazione Livio Sciutto Onlus, Campus Savona - Università degli Studi di Genova, Via Magliotto 2, Savona, Italy
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The number of primary total hip arthroplasties (THAs) and revisions is expected to steadily grow in the future. The femoral revision surgery can be technically demanding whether severe bone defects need to be addressed.
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The femoral revision aims to obtain a proper primary stability of the stem with a more proximal fixation as possible. Several authors previously proposed classification systems to describe the morphology of the bony femoral defect and to drive accordingly the surgeon in the revision procedure.
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The previous classifications mainly considered cortical and medullary bone at the level of the defect of poor quality by definition. Therefore, the surgical strategies aimed to achieve a distal fixation bypassing the defect or to fill the defect with bone impaction grafting or structured bone grafts up to the replacement of the proximal femur with megaprosthesis.
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The consensus on a comprehensive and reliable classification system and management algorithm is still lacking. A new classification system should be developed taking into account the bone quality. The rationale of a new classification is that ‘functional’ residual bone stock could be present at the level of the defect. Therefore, it can be used to achieve a primary (mechanical) and secondary (biological) stability of the implants with a femoral fixation more proximal as possible.
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Aim
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The aim of this study was to provide a comprehensive overview of floating hip injury and attempt to provide a management algorithm.
Methods
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PubMed was searched using the terms ‘Floating hip’ or ‘acetabular fracture’ and ‘Ipsilateral femoral fracture’ or ‘pelvic fracture’ and ‘Ipsilateral femoral fracture’. One author performed a preliminary review of the abstracts and references of the retrieved articles.
Results
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The mean injury severe score reported was higher than 20. Chest and abdominal injuries, as well as fractures at other sites, were the most common associated injuries. Despite the high disability rate, surgery remained the preferred option for managing these injuries. The surgical timing varied from a few hours to several days and was subjected to the principles of damage control orthopedics. Although, in most cases, fixation of femoral fractures took precedence over pelvic or acetabular fractures, there was still a need to consider the impact of damage control orthopedics, associated injuries, and surgeon's considerations and preferences. Posttraumatic arthritis, neurological deficits, heterotopic ossification, femoral head necrosis, femoral nonunion, and limb inequality were common complications of the floating hip injury.
Conclusions
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The severity of such injuries often exceeds that of an isolated injury and often requires specialized multidisciplinary treatment. In the management of these complex cases, the complexity and severity of the injury should be fully assessed, and an appropriate surgical plan should be developed to perform definitive surgery as early as possible, with attention to prevention of complications during the perioperative period.
Fondazione Livio Sciutto Onlus, Campus Savona - Università degli Studi di Genova, Via
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Department of Orthopaedics and Traumatology, IRCCS Fondazione Policlinico San Matteo, University of Pavia, Pavia, Italy
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Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Milan, Italy
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Fondazione Livio Sciutto Onlus, Campus Savona - Università degli Studi di Genova, Via
Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Milan, Italy
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