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Updated: Oct 21, 2025
Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
Published on: February 27, 2018
Low dislocation rates with the use of patient specific "Safe zones" in total hip arthroplasty
Abhinav K Sharma1, Zlatan Cizmic2, Douglas A Dennis3
1University of California, Irvine, School of Medicine, Department of Orthopaedic Surgery, Orange, CA 92868, USA.
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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