Open Access Research article

Knee extension range of motion and self-report physical function in total knee arthroplasty: mediating effects of knee extensor strength

Yong-Hao Pua1*, Peck-Hoon Ong1, Hwei-Chi Chong1, William Yeo2, Celia Tan3 and Ngai-Nung Lo4

Author Affiliations

1 Department of Physiotherapy, Singapore General Hospital, Singapore, Singapore

2 Orthopaedic Diagnostic Centre, Singapore General Hospital, Singapore, Singapore

3 Allied Health Division, Singhealth, Singapore, Singapore

4 Department of Orthopaedic Surgery, Singapore General Hospital, Singapore, Singapore

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BMC Musculoskeletal Disorders 2013, 14:33  doi:10.1186/1471-2474-14-33

Published: 18 January 2013

Additional files

Additional file 1:

Figure S1. Flowchart of participant recruitment. TKA = Total Knee Arthroplasty, HTO = High Tibial Osteotomy, UKA = Unicompartmental Knee Arthroplasty. Figure S2. Scattergram of changes in SF-36 physical function scores versus changes in knee extension ROM in 441 patients. The straight line represents ordinary least product regression line with its 95% confidence limits (curved lines): (changes in SF-36 physical function) = 15.5 (14.4 to 16.5)  + 2.9 (2.7 to 3.2) X (changes in knee extension ROM). Observed change scores of the knee and SF-36 measures are indicated by the short vertical lines above the x- and y-axes, respectively. Figure S3. Scattergram of changes in SF-36 physical function scores versus changes in knee extension strength in 441 patients. The straight line represents ordinary least product regression line with its 95% confidence limits (curved lines): (changes in SF-36 physical function) = 8.1 (6.3 to 9.7) + 2.5 (2.3 to 2.7) X (changes in knee extensor strength). Observed change scores of the knee and SF-36 measures are indicated by the short vertical lines above the x- and y-axes, respectively.

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