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· DOS Abstracts
Functional capacity is associated with both exten-
sor and flexor strength in patients scheduled for total
knee arthroplasty: a cross-sectional study
Birgit Skoffer, Ulrik Dalgas, Inger Mechlenburg, Kjeld Søballe, Thomas Maribo
Institute of Clinical Medicine and Department of Physical and Occupational
Therapy, Aarhus University and Aarhus University Hospital; Section of Sport
Science, Department of Public Health, Aarhus University; Institute of Clinical
Medicine and Orthopaedic Research Centre, Aarhus University and Aarhus
University Hospital; Orthopaedic Research Centre, Aarhus University Hospital;
MarselisborgCentret, Danish Rehabilitation Research Centre; National Public
Health and Quality Impro, Central Denmark Region and Aarhus University
Background:
Impairment of the knee extensor muscle strength in patients with
knee osteoarthritis (OA) is well documented. Furthermore, pain and reduced
functional capacity in combination with radiographically confirmed severe OA
are the main indications for total knee arthroplasty (TKA).
Purpose / Aim of Study:
To test in people scheduled for TKA if muscle
strength would be 1) strongly associated with both objectively measured func-
tional capacity and patient-reported measures; 2) more closely associated with
lower extremity function when measured during concentric than during isomet-
ric contractions and; and 3) more strongly related to the 30-sec-sit-to-stand
(30sSTS) test than to the timed-up-and- go (TUG) and walking tests.
Materials and Methods:
In fifty nine patients (70.4±6.8 years). Associations
between muscle strength and objectively measured functional capacity and pa-
tient reported outcomes were calculated.
Findings / Results:
Both knee extensor and knee flexor strength were associ-
ated with functional capacity outcomes. Generally, the isokinetic knee flexor
muscle strength was more strongly associated with functional capacity than the
isometric knee flexor strength. Isokinetic and isometric knee extensor strength
were of equal importance. The 30sSTS test was better than the TUG and the
walking tests at determining muscle strength.
Conclusions:
Knee extensor and knee flexor muscle strength and functional
capacity are generally associated. Focus on knee extensor and knee flexor mus-
cle strength is of equal importance to improve or maintain functional capac-
ity. Furthermore, the 30sSTS test was found to be the best proxy measure of
muscle strength when more advanced equipment for measurement of muscle
strength is not available.
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