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Arthritis Care Res (Hoboken). 2015 May;67(6):799-808. doi: 10.1002/acr.22474.

Body mass index and functional mobility outcome following early rehabilitation after a total knee replacement: a retrospective study in Taiwan.

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Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan.
National Taipei University of Nursing and Health Sciences, Taipei, Taiwan.
Shuang Ho Hospital and Graduate Institute of Injury Prevention and Control, Taipei Medical University, Taipei, Taiwan.



Obesity 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.


A 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.


A 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).


Patients with class II/III obesity benefit from early post-TKR outpatient rehabilitation and respond as well as patients with lower BMIs.

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