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Radiographic Evaluation of Hip Dislocations Necessitating Revision Total Hip Arthroplasty
Insights
Prosthetic hip dislocation often requires revision surgery. Radiographic analysis revealed that the prosthetic center of rotation (pCOR) location relative to the native center of rotation (nCOR) may be a key factor in revision arthroplasty.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Radiology
Background:
- Prosthetic hip dislocation is a frequent cause for revision arthroplasty.
- Limited research exists on radiographic predictors of revision surgery for hip dislocations.
Purpose of the Study:
- To radiographically evaluate prosthetic hip dislocations treated at a single institution.
- To specifically assess radiographic factors in hips requiring revision surgery.
Main Methods:
- Radiographic evaluation of all prosthetic hip dislocations.
- Comparative analysis of hips undergoing revision surgery.
Main Results:
- The prosthetic center of rotation (pCOR) was consistently superolateral or inferolateral to the native center of rotation (nCOR).
- Most hips exhibited pCOR distances exceeding 5 mm from the nCOR.
- Cup inclination and anteversion angles were generally within the established Lewinnek safe zone.
Conclusions:
- Identifying similarities in pCOR positioning may help reduce prosthetic hip instability.
- Improved surgical planning based on radiographic findings can enhance the success of hip arthroplasty.
Abstract:
Although prosthetic hip dislocation is a common reason for revision arthroplasty, few studies have comprehensively evaluated the radiographic factors that may lead to the need for revision. Therefore, the authors radiographically evaluated all prosthetic hip dislocations that were treated at one institution. They then specifically assessed those that required revision surgery. The authors found that the prosthetic center of rotation (pCOR) was located superolateral and inferolateral to the native COR (nCOR) in all patients. Most hips had pCOR distances more than 5 mm from the nCOR. Furthermore, most patients had cup inclination and anteversion angles within Lewinnek's previously defined "safe zone." Determining these similarities and properly planning these procedures may help decrease the instability rate and therefore improve the overall success of this procedure. [Orthopedics.2016; 39(5):e1011-e1018.].
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