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We studied 72 patients before and after bilateral total hip arthroplasty (THA), and using gait analysis, we compared them with 253 patients who had undergone staged unilateral THA. The average age of the patients was 59 years at the time of the first operation. The mean follow-up period was 40.5 months for the unilateral THA group and 40.2 months after the second THA for the bilateral THA group. The average interval between the first and second THA was 3 weeks. Using a force-measurement platform, we characterized the functional results of both groups. The platform allowed measurement of free-walking speed, step frequency, stride length, step length, and single- and double-support durations. The patients with bilateral THA successfully achieved optimal function similar to those with unilateral THA, except with respect to the step length at 2-6 months after the second THA. The patients in the bilateral THA group briefly demonstrated short-step walking. The 3-week interval between the THAs and early weight-bearing did not affect the improvement in gait when cementless THA was conducted.

Walking Ability following Total Hip Arthroplasty: A Comparison of Gait Analysis in Unilateral and Bilateral Cases