Second Look—Clinical News and Views

Walking for knee OA
Findings published online in Arthritis Care & Research suggest that increased walking may be linked with reduced risk of functional limitation for patients with knee osteoarthritis (OA). In a study evaluating the association of steps/day at baseline with the development of functional limitation 2 years later, researchers found that each additional 1,000 steps/day was associated with a 16 percent reduction in incident functional limitation by performance-based measures and an 18 percent reduction by self-reported measures. The study involved 1,788 participants with a mean age of 67 years.

Efficacy of mobile- and fixed-bearing TAA devices
A study in The Journal of Bone & Joint Surgery (JBJS, June 18) found that both mobile- and fixed-bearing total ankle arthroplasty (TAA) devices improve gait and reduce pain, but in different ways. Among 90 patients who underwent TAA—49 with mobile-bearing devices and 41 with fixed-bearing devices—researchers found no significant difference in ankle motion or step time between implant types or across time at 2-year follow-up. The fixed-bearing group had a greater increase in peak plantar flexion moment and Short Form-36 total scores, while the mobile-bearing group exhibited greater improvement in visual analog scale pain scores.

These items originally appeared in AAOS Headline News Now, a thrice-weekly enewsletter that keeps AAOS members up to date on clinical, socioeconomic, and political issues, with links to more detailed information. Subscribe at www.aaos.org/news/news.asp (member login required)

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