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Performance on a Clinical Quadriceps Activation Battery Is Related to a Laboratory Measure of Activation and Recovery After Total Knee Arthroplasty

OBJECTIVE: To determine the relation between performance on a clinical quadriceps
activation battery with (1) activation measured by doublet interpolation and (2)
recovery of quadriceps strength and functional performance after total knee
arthroplasty (TKA). DESIGN: Planned secondary analysis of a randomized controlled trial. SETTING: University research laboratory. PARTICIPANTS: Patients (N=162;
mean age, 63+/-7y; 89 women) undergoing TKA. MAIN OUTCOME MEASURES: Patients were
classified as high (quadriceps activation battery >/=4/6) or low (quadriceps
activation battery </=3/6) based on performance on the quadriceps activation
battery measured 4 days after TKA. Differences between groups in activation and
recovery at 1, 2, 3, 6, and 12 months after TKA were compared using a
repeated-measures maximum likelihood model. RESULTS: The low quadriceps
activation battery group demonstrated poorer quadriceps activation via doublet
interpolation (P=.01), greater quadriceps strength loss (P=.01), and greater
functional performance decline (all P<.001) at 1 month after TKA compared with
the high quadriceps activation battery group. Differences between low and high
quadriceps activation battery groups on all measures did not persist at 3 and 12
months (all P>.05). CONCLUSIONS: Poor performance on the quadriceps activation
battery early after TKA is related to poor quadriceps activation and poor
recovery in the early postoperative period. Patients in the low quadriceps
activation battery group took 3 months to recover to the same level as the high
quadriceps activation battery group. The quadriceps activation battery may be
useful in identifying individuals who need specific interventions to target
activation deficits or different care pathways in the early postoperative period
to speed recovery after TKA.
CI - Copyright (c) 2017 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS

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