Zügner R, et al. - Researchers studied the repeatability of hip motion measurements in patients with unilateral osteoarthritis (OA), patients with unilateral total hip arthroplasty (THA) and healthy controls. Compared to patients operated with a THA and healthy controls, the poorest repeatability between gait recordings collected by different examiners was shown by the patients with hip osteoarthritis. One to 2 years after the operation, findings suggested that walking pattern still differed comparing a group of THA from a group of healthy controls.