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The longitudinal relationship between physical capacity and self-perceived physical functioning after total hip and
Dennis J van den Berg1,2,3, Esther T Maas1, Thea P M Vliet Vlieland3,4
1Department of Health Sciences, Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, the Netherlands.
Objective:
To examine longitudinal within-person effects between capacity and self-perceived performance during postoperative physiotherapy in patients with total hip and knee arthroplasty (THA/TKA).
Methods:
We performed a secondary analysis of a cluster randomized controlled trial on physiotherapy after THA and TKA using random intercept cross lagged panel models. Capacity was assessed with the 40-m fast-paced walk test (40 m FPWT) and the 30-s chair-stand test (30-s CST), and self-perceived performance with the Oxford Hip/Knee Score functioning subscale (OHS/OKS) and the Hip disability/Knee injury and Osteoarthritis Outcome Score-Physical function Short form (HOOS-PS/KOOS-PS). Assessments were performed preoperatively and at 3 and 12 months postoperatively.
Results:
312 THA (mean age 66, SD: 9; 53% female) and 312 TKA (mean age 67, SD: 8; 55% female) were included. From pre-surgery to 3 months, no effects were found between capacity and self-perceived performance in either THA or TKA.From 3 to 12 months, in THA, 40 m FPWT performance at 3 months had a positive effect (β 0.34, 95% CI 0.05-0.63) on HOOS-PS scores at 12 months. In TKA, 40 m FPWT performance at 3 months had a positive effect on both OKS functioning (β 0.24 95% CI 0.05-0.43) and KOOS-PS (β 0.29 95% CI 0.11-0.47) scores at 12 months. No other effects were observed.
Conclusion:
From pre-surgery to 3 months, capacity and self-perceived performance showed no effects within individuals. However, during the early postoperative phase, gait speed may be a relevant treatment target to improve long-term self-perceived performance.