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Dislocation and subluxation of the total hip replacement
Clinical Orthopaedics and Related Research
|November 1, 1976
Summary
Total hip replacements can dislocate or subluxate within six weeks post-surgery, often due to implant positioning or patient positioning. Hyperflexing activities were a major cause of subluxations, particularly with Charnley prostheses.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
Background:
- Total hip replacement (THR) is a common procedure to address hip joint degeneration.
- Postoperative complications like dislocation and subluxation can significantly impact patient outcomes.
- Understanding the incidence and causes of these complications is crucial for improving surgical techniques and patient management.
Purpose of the Study:
- To investigate the incidence of postoperative dislocations and subluxations following total hip replacement.
- To identify potential risk factors and causes associated with these complications.
- To analyze the relationship between prosthesis type and the occurrence of dislocations and subluxations.
Main Methods:
- Retrospective analysis of 502 total hip replacement cases.
- Documentation of early postoperative complications (dislocations and subluxations) within the first six weeks.
- Comparison of complication rates across different implant types.
- Identification of patient positioning and activity-related factors contributing to complications.
Main Results:
- A 1% dislocation rate (7/502) and a 5.5% subluxation rate (28/502) were observed within six weeks postoperatively.
- Improper implant or patient positioning were identified as primary causes for dislocations.
- While no statistical correlation existed between nonunion rates and prosthesis type, 22 of 28 subluxations involved Charnley prostheses.
- Ninety-three percent of subluxations were linked to hyperflexing activities.
Conclusions:
- Early postoperative dislocations and subluxations after total hip replacement are relatively uncommon but significant complications.
- Implant and patient positioning are critical factors in preventing early dislocations.
- Hyperflexing activities represent a substantial risk for subluxation, particularly in patients with Charnley prostheses.
- Further research into activity modification and implant considerations may help reduce subluxation rates.