To evaluate the impact of spinopelvic alignment on combined anteversion targets in patients undergoing total hip arthroplasty (THA) for improved surgical outcomes.
Key Findings:
Patients with flatback deformity had lower combined anteversion (CA) midpoint targets (41 degrees) compared to normal alignment (47 degrees), with statistical significance.
Patients with stiff spinopelvic mobility had a narrower acceptable CA range (15 degrees) compared to normal alignment (19 degrees), indicating reduced compensatory motion.
Greater pelvic incidence-lumbar lordosis mismatch was associated with lower CA midpoint values, with an estimated 2-degree decrease in target CA for every 10-degree increase in mismatch.
Narrower radiographic anteversion range correlated with female sex, higher BMI, and greater stem anteversion, highlighting demographic influences.
Interpretation:
Spinopelvic abnormalities significantly influence the optimal target and tolerance range of combined anteversion after THA, suggesting the need for individualized acetabular component planning to enhance surgical outcomes.
Limitations:
Spinopelvic alignment assessed only postoperatively, limiting preoperative insights.
Motion analysis limited to sit-to-stand movement, which may not represent all functional activities.
Impingement model did not account for soft tissue or bone-to-bone contact, potentially underestimating impingement risks.
Cup inclination fixed at 40 degrees; patient-reported outcomes were unavailable, limiting patient perspective on outcomes.
Conclusion:
The findings support tailored approaches in THA for patients with spinopelvic abnormalities, emphasizing the potential benefits of advanced surgical techniques and implant designs to improve patient outcomes.
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