{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T08:10:11Z","timestamp":1787645411534,"version":"build-2736575974"},"reference-count":40,"publisher":"Oxford University Press (OUP)","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2008,5,1]]},"abstract":"\n Background and Purpose<\/jats:title>\n Following total knee arthroplasty (TKA), quadriceps femoris muscle strength (force-generating capacity) and functional test scores improve but continue to be lower than those in people without injury. Analysis of the sit-to-stand (STS) task demonstrated side-to-side differences in subjects with TKA, as well as differences between subjects with TKA and control subjects. It was hypothesized that, when using a self-selected starting position, subjects 1 year following TKA would show improvements in strength and movement patterns but would continue to show asymmetries of angles and moments at the hips and knees.<\/jats:p>\n <\/jats:sec>\n \n Subjects and Methods<\/jats:title>\n Twenty-four subjects (12 subjects with unilateral TKA and 12 control subjects) were recruited; those with TKA were tested 3 months and 1 year following surgery. Motion analysis of an STS task was synchronized with 2 force platforms and electromyography. Outcome measures included joint angles and moments, electromyography, vertical ground reaction forces, muscle strength, and functional performance tests.<\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n Subjects with TKA showed improvements in symmetry of motion, strength, and functional performance from 3 months to 1 year following TKA. Compared with control subjects, subjects with TKA relied on increased hip flexion and a larger hip extensor moment to perform the STS task.<\/jats:p>\n <\/jats:sec>\n \n Discussion and Conclusion<\/jats:title>\n The increased hip extensor moment demonstrated that subjects adopted a strategy to avoid the use of the quadriceps femoris muscle, yet this strategy persisted as quadriceps femoris muscle strength improved. This pattern may be a learned movement pattern that may not resolve without retraining.<\/jats:p>\n <\/jats:sec>","DOI":"10.2522\/ptj.20070045","type":"journal-article","created":{"date-parts":[[2008,2,21]],"date-time":"2008-02-21T21:06:12Z","timestamp":1203627972000},"page":"567-579","source":"Crossref","is-referenced-by-count":85,"title":["Persistence of Altered Movement Patterns During a Sit-to-Stand Task 1 Year Following Unilateral Total Knee Arthroplasty"],"prefix":"10.1093","volume":"88","author":[{"given":"Sara J","family":"Farquhar","sequence":"first","affiliation":[{"name":"SJ Farquhar, PT, MPT, is a doctoral student in the Graduate Program in Biomechanics and Movement Science and the Department of Physical Therapy, University of Delaware."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Darcy S","family":"Reisman","sequence":"additional","affiliation":[{"name":"DS Reisman, PT, PhD, is Assistant Professor, Department of Physical Therapy, University of 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