Gait variability changes before and after total hip arthroplasty (THA) are unclear. This study aimed to investigate gait variability changes in hip osteoarthritis (OA) patients before and after THA and to examine the relationships between gait variability changes and hip function.
Twenty-three female patients with hip OA (61.0±7.1 years) and 10 healthy female participants (57.8±3.9 years) were assessed 1 month before and 12 months after surgery. Heel and lower trunk accelerations were measured using two triaxial accelerometers. The coefficient of variation (CV) of stride time for gait variability of lower limb motions and the harmonic ratio (HR) for trunk variability were calculated. Radiographic leg-length discrepancy, hip abductor strength, hip abduction, extension range of motion (ROM), and pain level during gait were measured.
CV was significantly decreased after THA and was comparable to that in healthy individuals. While postoperative HRs were greater than preoperative HRs, they were not comparable with those in healthy individuals. CV changes were associated with pain relief during gait. HR changes were associated with hip abductor strength, extension ROM, and limb lengthening.
Gait variability improved after THA due to improved hip function. However, trunk variability was insufficient compared to that in healthy individuals.
aAnshin Hospital, 1-4-12, Minatojima Minamimachi, Chuo-ku, Kobe City, Hyogo, Japan
bDepartment of Physical Therapy, Faculty of Rehabilitation, Kobe Gakuin University, 518 Ikawadanicho, Arise, Nishi-ku, Kobe, Hyogo 651-2180, Japan
cDepartment of Physical Therapy, School of Health Sciences, Tokyo University of Technology, 5-23-22, Nishikamata, Ota-ku, Tokyo, Japan
Correspondence: Osamu Wada, Anshin Hospital, 1-4-12, Minatojima Minamimachi, Chuo-ku, Kobe City, Hyogo, Japan. Tel: +81-78-304-5252. Email: firstname.lastname@example.org
Funding or grants: None
Financial benefits: None
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