This study tested whether multi-joint osteoarthritis (OA) accelerates frailty progression over 6 years in 13,757 adults from the Canadian Longitudinal Study on Aging, comparing those with no OA, one-joint, two-joint, and three-joint OA (knee, hip, or hand) using linear mixed-effects models.
Frailty progressed 40–47% faster in those with two-or-three affected joints vs. no OA (slopes: 0.348 and 0.330 vs. 0.237), and multi-joint OA (≥2 joints) progressed faster than single-joint OA [β=0.070, 95% CI: 0.029–0.109], despite those groups starting at higher baseline frailty.
OA was self-reported by physician diagnosis (no imaging confirmation), frailty was assessed at only three time points over 6 years, and the observational design limits causal inference.
Clinicians should treat multi-joint OA as a red flag for accelerated frailty — patients with two or more affected joints warrant proactive frailty screening and targeted intervention. Single-joint OA also carries risk, but multi-joint involvement marks a meaningfully steeper health decline.
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