Hip offset and leg-length restoration in revision hip arthroplasty with a monoblock, hydroxyapatite-coated stem.

Abstract

Restoration of normal hip biomechanics in arthroplasty surgery is important in order to achieve good muscle function and joint stability. In this retrospective cohort study, we examined the postoperative radiographs of 131 femoral revision arthroplasty procedures using a monoblock, fully hydroxyapatite (HA)-coated titanium stem. Femoral offset, modified-global offset and leg length were measured of the operated and contralateral hips. Femoral offset was restored to ±10 mm in 108 cases (82%), modified-global offset was restored ±10 mm in 93 cases (71%) and leg length was restored to ±10 mm in 102 cases (81%). There were 4 dislocations with a mean follow-up period of 38 months. Restoration of hip biomechanics is achievable with a monoblock stem and thus is a viable option in revision hip arthroplasty.