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The impact of modularity in total hip arthroplasty
M J Chmell1, D Rispler, R Poss
1Department of Orthopedic Surgery, Brigham and Women's Hospital, Boston, MA 02115, USA.
Clinical Orthopaedics and Related Research
|October 1, 1995
Summary
Increased modularity in total hip arthroplasty correlates with earlier complications like bone loss and loosening. Suboptimal design, not modularity itself, likely causes these adverse outcomes in hip implants.
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
- Medical Device Design
Background:
- Modularity in total hip arthroplasty (THA) offers benefits like inventory reduction and surgical flexibility.
- However, the potential impact of modularity on long-term THA outcomes requires thorough investigation.
Purpose of the Study:
- To evaluate the association between the number of modular junctions in THA prostheses and clinical outcomes.
- Specifically, to assess effects on bone loss, fixation durability, failure time, and revision rates.
Main Methods:
- Retrospective analysis of THA cases over 25 years using a total joint registry.
- Comparison of outcomes based on the degree of modularity in the hip prostheses implanted.
Main Results:
- An increased number of modular junctions was associated with earlier onset of radiolucencies.
- Higher modularity correlated with an increased incidence of aseptic loosening and osteolysis, even without loosening.
Conclusions:
- Suboptimal design features within modular THA components, rather than modularity per se, appear to be the primary driver of adverse outcomes.
- Potential exists for polyethylene stress beyond performance limits due to suboptimal design in modular THA systems.