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The Eccentric Torque Production Capacity of the Ankle, Knee, and Hip Muscle Groups in Patients with Unilateral Chronic Ankle Instability

Author(s):
Hossein NegahbanHossein Negahban1, Aida Moradi-BousariAida Moradi-Bousari1,*, Saeed NaghibiSaeed Naghibi2, Javad SarrafzadehJavad Sarrafzadeh3, Mohammad-Jafar Shaterzadeh-YazdiMohammad-Jafar Shaterzadeh-Yazdi1, Shahin GoharpeyShahin Goharpey1, Malihe EtemadiMalihe Etemadi1, Masood MazaheriMasood Mazaheri4, Awat FeiziAwat Feizi5
1Musculoskeletal Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
2Sport Science Research Center, Tehran, Iran
3Department of Physical Therapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
4Musculoskeletal Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
5Department of Epidemiology and Biostatistics, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran


Asian Journal of Sports Medicine:Vol. 4, issue 2; 144-152
Published online:Feb 26, 2013
Article type:Research Article
Received:Nov 05, 2012
Accepted:Feb 08, 2013
How to Cite:Hossein NegahbanAida Moradi-BousariSaeed NaghibiJavad SarrafzadehMohammad-Jafar Shaterzadeh-YazdiShahin GoharpeyMalihe EtemadiMasood MazaheriAwat Feiziet al.The Eccentric Torque Production Capacity of the Ankle, Knee, and Hip Muscle Groups in Patients with Unilateral Chronic Ankle Instability.Asian J Sports Med.4(2):34515.https://doi.org/10.5812/asjsm.34515.

Abstract

Purpose:

The aim of this study was to investigate eccentric torque production capacity of the ankle, knee and hip muscle groups in patients with unilateral chronic ankle instability (CAI) as compared to healthy matched controls.

Methods:

In this case-control study, 40 participants (20 with CAI and 20 controls) were recruited based on convenient non-probability sampling. The average peak torque to body weight (APT/BW) ratio of reciprocal eccentric contraction of ankle dorsi flexor/plantar flexor, ankle evertor/invertor, knee flexor/extensor, hip flexor/extensor and hip abductor/adductor was determined using an isokinetic dynamometer. All subjects participated in two separate sessions with a rest interval of 48 to 72 hours. In each testing session, the torque production capacity of the ankle, knee, and hip muscle groups of only one lower limb was measured. At first, 3 repetitions of maximal eccentric-eccentric contraction were performed for the reciprocal muscles of a joint in a given movement direction. Then, the same procedure of practice and testing trials was repeated for the next randomly-ordered muscle group or joint of the same limb.

Results:

There was no significant interaction of group (CAI and healthy controls) by limb (injured and non-injured) for any muscle groups. Main effect of limb was not significant. Main effect of group was only significant for eccentric torque production capacity of ankle dorsi flexor and hip flexor muscle groups. The APT/BW ratio of these muscles was significantly lower in the CAI group than the healthy controls (P<0.05).

Conclusion:

CAI is associated with eccentric strength deficit of ankle dorsi flexor and hip flexor muscles as indicated by reduction in torque production capacity of these muscles compared to healthy controls. This strength deficit appeared to exist in both the injured and non-injured limbs of the patients.

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