Impingement-free range of movement, acetabular component cover and early clinical results comparing 'femur-first' navigation and 'conventional' minimally invasive total hip arthroplasty: a randomised controlled trial

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135 patients scheduled for minimally invasive total hip arthroplasty (THA) were randomized to either a navigated 'femur first' technique or conventional technique. The purpose of this study was to evaluate and compare the proportion of patients displaying CT-based range of motion necessary for activities of daily life (ADL) without prosthetic-bone or prosthetic-prosthetic impingement. Clinical outcome scores and clinical range of motion were also evaluated over one-year follow-up. The results demonstrated a higher proportion of patients in the 'femur first' group with impingement free flexion exceeding 110 degrees, but no significant differences in any other motion (extension, internal rotation, etc.). Clinical outcome scores and clinical ROM were similar between groups at one year postoperatively.