• Chun-de Liao, Yi-Ching Huang, Li-Fong Lin, Shih-Wei Huang, and Tsan-Hon Liou.
• Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan.
• Arthritis Care Res (Hoboken). 2015 May 1;67(6):799-808.

ObjectiveObesity is associated with an increased risk of osteoarthritis, and the incidence of obese patients requiring a total knee replacement (TKR) has increased in recent years. A high body mass index (BMI) may influence post-TKR rehabilitation outcomes. We investigated the effects of obesity on functional mobility outcomes following post-TKR rehabilitation in Asian patients whose BMIs were not as high as those reported in similar studies performed in non-Asian countries.MethodsA total of 113 patients were categorized as normal weight (n = 23), overweight (n = 32), class I obese (n = 31), or class II/III obese (n = 27). Patients were retrospectively followed up for 6 months after undergoing TKR followed by 2 months of active rehabilitation. Outcome measures were recorded at baseline and at the 2-month and 6-month followup assessments and included the Western Ontario and McMaster Universities Osteoarthritis Index and the following tests: functional reach, single-leg stance, ten-meter walk, timed up and go, chair rise, and stair climbing.ResultsA 4 × 3 (group × time) repeated-measures analysis of variance showed significant improvement in all of the outcome measures for all of the BMI groups at the 2-month and 6-month followup assessments (P < 0.05 for all). No significant intergroup differences at the 2-month and 6-month followup assessments were observed for any of the mobility measures except the functional reach and single-leg stance (P < 0.05).ConclusionPatients with class II/III obesity benefit from early post-TKR outpatient rehabilitation and respond as well as patients with lower BMIs.© 2015, American College of Rheumatology.

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