Strain on the anterior cruciate ligament during closed kinetic chain exercises

The purpose of this investigation was to characterize the ACL strains produced during four commonly prescribed CKC exercises; the step-up, the step-down, the lunge, and the one-legged sit to stand. We hypothesized that the ACL strains produced during the lunge and one-legged sit to stand exercises (...

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Bibliographic Details
Published in:Medicine and science in sports and exercise 2004-06, Vol.36 (6), p.935-941
Main Authors: HEIJNE, Annette, FLEMING, Braden C, RENSTROM, Per A, PEURA, Glenn D, BEYNNON, Bruce D, WERNER, Suzanne
Format: Article
Language:English
Subjects:
Adult
Anterior Cruciate Ligament - physiology
Anterior Cruciate Ligament - physiopathology
Biological and medical sciences
Exercise
Female
Humans
Injuries of the limb. Injuries of the spine
Kinetics
Male
Medical sciences
Medicin och hälsovetenskap
Middle Aged
Space life sciences
Traumas. Diseases due to physical agents
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Summary:The purpose of this investigation was to characterize the ACL strains produced during four commonly prescribed CKC exercises; the step-up, the step-down, the lunge, and the one-legged sit to stand. We hypothesized that the ACL strains produced during the lunge and one-legged sit to stand exercises (the exercises that challenge the leg musculature to a greater extent and utilize greater hip flexion) would be less than those produced during the step-up and step-down exercises. The strains in the anteromedial bundle of the ACL were measured while nine subjects, who had normal ligaments, performed the four exercises. Peak ACL strain values and the ACL strain patterns as a function of knee flexion angle were compared between exercises. No significant differences were found between the peak ACL strain values (mean +/- SEM) between exercises (step-up: 2.5 +/- 0.36; step-down: 2.6 +/- 0.34; lunge 1.9 +/- 0.50; one-legged sit to stand: 2.8 +/- 0.27). The mean ACL strain values as a function of knee flexion angle were not significantly different. On average, there was a significant increase in ACL strain as the knee was extended for each exercise. The ACL strain responses produced during these CKC exercises were equal and similar to those produced during other rehabilitation exercises (i.e., squatting, active extension of the knee) previously tested.
ISSN:0195-9131
1530-0315
DOI:10.1249/01.mss.0000128185.55587.a3