Effect of Double Pelvic Osteotomy on Dorsal Acetabular Rim Angle Using Computed Tomography in 27 Dogs
🔍 Key Findings
- Double pelvic osteotomy (DPO) significantly decreases dorsal acetabular rim angle (DARA), confirming improved acetabular ventroversion and femoral head coverage in dysplastic hips.
- The achieved acetabular ventroversion is consistently less than the plate’s predetermined angle, indicating predictable loss of rotation during DPO.
- Median reduction in DARA was 23.4°, 16.7°, and 15° with 30°, 25°, and 20° plates respectively, demonstrating that larger plates produce greater rotation but still less than intended.
- Actual ventroversion achieved was ~5–8° less than the plate angle, with median losses of 6.6°, 8.3°, and 5° for 30°, 25°, and 20° plates.
- Postoperative DARA decreased from ~16–18° preoperatively to approximately −4°, aligning with recommended postoperative acetabular slope targets.
- Postoperative DARA remained stable on short-term (~48 days) and long-term (~386 days) CT follow-up, suggesting minimal remodeling after DPO.
- Most acetabular rotation (~88%) occurs at the pelvic symphysis rather than through iliac torsion, explaining partial loss of rotation relative to plate angle.
- CT-measured DARA provides a reliable surgical planning metric and may improve implant angle selection for DPO procedures.
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🔍 Key Findings
- Double pelvic osteotomy (DPO) significantly decreases dorsal acetabular rim angle (DARA), confirming improved acetabular ventroversion and femoral head coverage in dysplastic hips.
- The achieved acetabular ventroversion is consistently less than the plate’s predetermined angle, indicating predictable loss of rotation during DPO.
- Median reduction in DARA was 23.4°, 16.7°, and 15° with 30°, 25°, and 20° plates respectively, demonstrating that larger plates produce greater rotation but still less than intended.
- Actual ventroversion achieved was ~5–8° less than the plate angle, with median losses of 6.6°, 8.3°, and 5° for 30°, 25°, and 20° plates.
- Postoperative DARA decreased from ~16–18° preoperatively to approximately −4°, aligning with recommended postoperative acetabular slope targets.
- Postoperative DARA remained stable on short-term (~48 days) and long-term (~386 days) CT follow-up, suggesting minimal remodeling after DPO.
- Most acetabular rotation (~88%) occurs at the pelvic symphysis rather than through iliac torsion, explaining partial loss of rotation relative to plate angle.
- CT-measured DARA provides a reliable surgical planning metric and may improve implant angle selection for DPO procedures.
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