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Published on: November 6, 2015
Modular neck prostheses in DDH patients: 11-year results
Francesco Traina1, Marcello De Fine, Enrico Tassinari
11st Department of Orthopaedic Surgery, Laboratory for Medical Technology (LTM), Istituti Ortopedici Rizzoli, Via Pupilli 1, 40136, Bologna, Italy.
Summary
Modular neck prostheses offer an effective solution for hip replacement in developmental dysplasia of the hip, restoring leg length and femoral offset. This study shows good mid-term outcomes and high survival rates with standard surgical techniques.
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
Background:
- Developmental dysplasia of the hip (DDH) presents surgical challenges for total hip replacement, often requiring specialized implants and techniques.
- Existing methods for DDH hip replacement yield variable outcomes, highlighting the need for improved treatment strategies.
Purpose of the Study:
- To evaluate the 11-year outcomes of using off-the-shelf modular neck prostheses in patients with DDH.
- To assess the efficacy of modular neck systems in restoring femoral offset, abductor lever arm, and leg length.
Main Methods:
- Retrospective analysis of 61 modular neck prostheses implanted in 47 DDH patients (1995-2004).
- Clinical outcomes assessed via Harris hip score and WOMAC score.
- Radiographic evaluation of femoral offset, hip center, leg length discrepancy, and abductor lever arm.
- Prosthesis survival analyzed using Kaplan-Meier method.
Main Results:
- Cumulative prosthesis survival at 11 years was 97.5%.
- Leg length discrepancy was minimized, and femoral offset was consistently restored.
- Mean Harris hip score at latest follow-up was 74.7.
Conclusions:
- Modular neck prostheses are an effective alternative for hip replacement in DDH.
- Modularity efficiently restores anatomical parameters and ensures stability.
- Achievable with standard surgical techniques and off-the-shelf implants, offering good mid-to-long-term results.