Lewinnek 1978 JBJS method for measuring anteversion (Version = arcsin (D1/D2).
Measure D1 and D2 input into cup version calculator.
There are other mathematical methods for measuring acetabular cup version based on a plain film radiograph of the pelvis which are evaluated by Park et al.
Park YS, Shin WC, Lee SM, et al. The best method for evaluating anteversion of the acetabular component after total hip arthroplasty on plain radiographs. J Orthop Surg Res. 2018; 13: 66.
Lewinnek GE, Lewis JL, Tarr R, et al. Dislocations after total hip-replacement arthroplasties. J Bone Joint Surg Am. 1978;60(2):217–220
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