Abhinav K Sharma1, Zlatan Cizmic2, Douglas A Dennis3, Stefan W Kreuzer4, Michael A Miranda5, Jonathan M Vigdorchik6. 1. University of California, Irvine, School of Medicine, Department of Orthopaedic Surgery, Orange, CA 92868, USA. 2. Ascension Providence Hospital Southfield Campus, Department of Orthopaedic Surgery, 16001 W Nine Mile Rd., Southfield, MI, 48075, USA. 3. Colorado Joint Replacement, Denver, CO, 80210, USA. 4. INOV8 Orthopedics, Houston, TX, 77043, USA. 5. Florida Orthopaedic Institute, Tampa, FL, 33637, USA. 6. Hospital for Special Surgery, Department of Orthopedic Surgery, Adult Reconstruction and Joint Replacement, New York, NY 10021, USA.
Abstract
INTRODUCTION: The purpose of this study was to compare patient-specific acetabular cup target orientation using functional simulation to the Lewinnek Safe Zone (LSZ) and determine associated rates of postoperative dislocation. METHODS: A retrospective review of 1500 consecutive primary THAs was performed. Inclination, anteversion, pelvic tilt, pelvic incidence, lumbar flexion, and dislocation rates were recorded. RESULTS: 56% of dynamically planned cups were within LSZ (p < 0.05). 6/1500 (0.4%) of these cups dislocated at two year follow-up, and all were within LSZ. CONCLUSION: Optimal acetabular cup positioning using dynamic imaging differs significantly from historical target parameters but results in low rates of dislocation. LEVEL OF EVIDENCE: Level III: Retrospective.
INTRODUCTION: The purpose of this study was to compare patient-specific acetabular cup target orientation using functional simulation to the Lewinnek Safe Zone (LSZ) and determine associated rates of postoperative dislocation. METHODS: A retrospective review of 1500 consecutive primary THAs was performed. Inclination, anteversion, pelvic tilt, pelvic incidence, lumbar flexion, and dislocation rates were recorded. RESULTS: 56% of dynamically planned cups were within LSZ (p < 0.05). 6/1500 (0.4%) of these cups dislocated at two year follow-up, and all were within LSZ. CONCLUSION: Optimal acetabular cup positioning using dynamic imaging differs significantly from historical target parameters but results in low rates of dislocation. LEVEL OF EVIDENCE: Level III: Retrospective.
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