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Total hip arthroplasty for bilaterally ankylosed hips
Yong Lae Kim1, Sang Ik Shin, Kwang Woo Nam
1Department of Orthopaedic Surgery, Seoul National University Hospital, Seoul, South Korea.
The Journal of Arthroplasty
|October 9, 2007
Summary
Bilateral total hip arthroplasties (THAs) in ankylosed hips showed favorable outcomes. However, pre-existing hip fusion influenced acetabular cup positioning, with many cups falling outside safe ranges.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
Background:
- Ankylosed hips present unique challenges for total hip arthroplasty (THA).
- Assessing the impact of pre-existing fusion on surgical outcomes is crucial.
Purpose of the Study:
- To evaluate the outcomes of bilateral total hip arthroplasties (THAs) in patients with bilaterally ankylosed hips.
- To analyze the influence of cup positioning on THA results in this specific patient cohort.
Main Methods:
- Retrospective analysis of 12 patients undergoing 24 bilateral THAs for ankylosed hips.
- Mean follow-up of 11 years, assessing clinical outcomes using Harris hip score.
- Evaluation of acetabular cup positioning relative to Lewinnek safe zones.
Main Results:
- Significant improvement in mean Harris hip score from 55.4 to 82.3.
- Osteolysis and loosening observed in 3 and 2 hips, respectively.
- 46% of acetabular cups were positioned outside the Lewinnek safe ranges, influenced by the fused limb position.
Conclusions:
- Bilateral THA in ankylosed hips yields favorable clinical outcomes.
- Pre-existing hip fusion can dictate acetabular cup malposition, necessitating careful surgical planning.
