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The effectiveness of dual offset stems in restoring offset during total hip replacement
P Dolhain1, H Tsigaras, R B Bourne
1Department of Adult Reconstructive Surgery, London Health Sciences Centre, University of Western Ontario, London, Ontario, Canada. pieterdolhain@hotmail.com
Acta Orthopaedica Belgica
|February 15, 2003
Summary
The Synergy hip prosthesis more reliably restored femoral offset compared to the Mallory-Head component. This finding is crucial for enhancing hip stability and abduction range after total hip replacement surgery.
Area of Science:
- Orthopedic surgery
- Biomedical engineering
- Radiographic analysis
Background:
- Total hip prostheses often have a higher neck-shaft angle than host bone, reducing femoral offset.
- Restoring femoral offset is important for hip stability and improving abduction range and strength.
Purpose of the Study:
- To compare two total hip prosthesis designs for their ability to restore femoral offset.
- To evaluate restoration of femoral offset against the contralateral normal hip.
Main Methods:
- Radiographic study of 202 primary total hip arthroplasty patients.
- Postoperative anteroposterior pelvic radiographs were used for measurements.
Main Results:
- The Synergy femoral component (131-degree neck-shaft angle) tended to restore femoral offset more reliably.
- The Mallory-Head femoral component (135-degree neck-shaft angle) was less effective in restoring femoral offset.
Conclusions:
- The Synergy component, with its varus neck-shaft angle and offset options, appears superior for restoring femoral offset.
- Accurate restoration of femoral offset is achievable with specific prosthesis designs, impacting hip biomechanics.