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Association between functional combined anteversion and dislocation after revision total hip arthroplasty.
Yuta Hieda1, Hyonmin Choe2, Koki Abe1
1Department of Orthopedic Surgery, Yokohama City University, 3-9 Fukuura, Kanazawa-Ku, Yokohama, Kanagawa, 236-0004, Japan.
Arthroplasty (London, England)
|April 10, 2026
Summary
Functional combined anteversion (CA), accounting for femoral rotation, is linked to dislocation after revision total hip arthroplasty (THA). This suggests femoral rotation is crucial for optimal implant positioning in revision THA surgery.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Arthroplasty Research
Background:
- Dislocation is a significant complication in total hip arthroplasty (THA).
- Combined anteversion (CA) is used for implant positioning, but the role of femoral rotation is understudied.
- This study investigates functional CA and its relation to dislocation in revision THA.
Purpose of the Study:
- To determine if functional combined anteversion (CA), which includes femoral rotation, is associated with post-operative dislocation in revision total hip arthroplasty (THA).
Main Methods:
- 82 patients undergoing revision THA with pre- and post-operative CT scans were analyzed.
- Functional CA was calculated, considering cup and stem anteversion along with femoral external rotation.
- Statistical analysis evaluated the association between CA, component alignment, and dislocation.
Main Results:
- Dislocation occurred in 12 patients.
- No significant differences were found in cup angle, stem angle, or anatomical CA between dislocated and non-dislocated groups.
- Dislocated cases showed significantly higher functional CA and greater deviation from identical CA values.
Conclusions:
- Functional CA, incorporating femoral rotation, is associated with dislocation after revision THA.
- Considering femoral rotation during implant positioning may be critical for reducing dislocation risk in revision THA.
