Effects of Immobilization on Plantar-Flexion Torque, Fatigue Resistance, and Functional Ability Following an Ankle Fracture

The goal of this investigation was to study the recovery of ankle plantar-flexor peak torque, fatigue resistance, and functional ability (stair climbing, walking) following cast immobilization in patients with ankle fractures. The participants were 10 patients who underwent open reduction-internal f...

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Veröffentlicht in:Physical therapy 2000-08, Vol.80 (8), p.769-780
Hauptverfasser: Michael A Shaffer, Enyi Okereke, John L Esterhai, Jr, Mark A Elliott, Glenn A Walter, Steven H Yim, Krista Vandenborne
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container_end_page 780
container_issue 8
container_start_page 769
container_title Physical therapy
container_volume 80
creator Michael A Shaffer
Enyi Okereke
John L Esterhai, Jr
Mark A Elliott
Glenn A Walter
Steven H Yim
Krista Vandenborne
description The goal of this investigation was to study the recovery of ankle plantar-flexor peak torque, fatigue resistance, and functional ability (stair climbing, walking) following cast immobilization in patients with ankle fractures. The participants were 10 patients who underwent open reduction-internal fixation and 8 weeks of cast immobilization following a fracture of the ankle mortise and 10 age- and sex-matched, noninjured comparison subjects. Plantar-flexor torque and fatigue resistance were measured at 1, 5, and 10 weeks of rehabilitation using an isokinetic dynamometer. Ankle plantar-flexor peak torque and fatigue resistance were correlated to timed ambulation, timed stair climbing, and unilateral heel-rises. Following immobilization, plantar-flexor peak torque was decreased at all angular speeds and positions. The decrease in peak torque was associated with an increase in fatigue resistance. With rehabilitation, ankle plantar-flexor torque and fatigue resistance normalized. Regression analysis revealed a strong relationship between plantar-flexor peak torque and functional measures. By 10 weeks post-immobilization, peak torque, fatigue resistance, and all measures of functional performance had returned to control levels. The decrease in muscle performance, functional ability, and fatigue resistance induced by 8 weeks of cast immobilization can be reversed with 10 weeks of supervised physical therapy. In addition, this study demonstrated that ankle-plantar flexor torque is a good predictor of stair-climbing and walking performance in patients with ankle fractures.
doi_str_mv 10.1093/ptj/80.8.769
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The participants were 10 patients who underwent open reduction-internal fixation and 8 weeks of cast immobilization following a fracture of the ankle mortise and 10 age- and sex-matched, noninjured comparison subjects. Plantar-flexor torque and fatigue resistance were measured at 1, 5, and 10 weeks of rehabilitation using an isokinetic dynamometer. Ankle plantar-flexor peak torque and fatigue resistance were correlated to timed ambulation, timed stair climbing, and unilateral heel-rises. Following immobilization, plantar-flexor peak torque was decreased at all angular speeds and positions. The decrease in peak torque was associated with an increase in fatigue resistance. With rehabilitation, ankle plantar-flexor torque and fatigue resistance normalized. Regression analysis revealed a strong relationship between plantar-flexor peak torque and functional measures. By 10 weeks post-immobilization, peak torque, fatigue resistance, and all measures of functional performance had returned to control levels. The decrease in muscle performance, functional ability, and fatigue resistance induced by 8 weeks of cast immobilization can be reversed with 10 weeks of supervised physical therapy. 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ispartof Physical therapy, 2000-08, Vol.80 (8), p.769-780
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source Oxford University Press Journals All Titles (1996-Current); MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
subjects Adult
Ankle
Ankle injuries
Ankle Injuries - rehabilitation
Ankle Injuries - surgery
Bed rest
Biomechanical Phenomena
Casts, Surgical - adverse effects
Evaluation
Female
Fracture Fixation, Internal - methods
Fractures
Fractures (Injuries)
Fractures, Bone - rehabilitation
Fractures, Bone - surgery
Gait - physiology
Health aspects
Humans
Immobilization - adverse effects
Injuries
Isometric Contraction
Male
Muscle Fatigue - physiology
Pain Measurement
Physical Therapy Modalities - methods
Range of Motion, Articular
Reference Values
Regression Analysis
Surgical casts
title Effects of Immobilization on Plantar-Flexion Torque, Fatigue Resistance, and Functional Ability Following an Ankle Fracture
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