The American Journal of Sports Medicine· 1990Q1
Altered timing of hamstring muscle action in anterior cruciate ligament deficient patients
- 122citations
- Q1SCImago
- 1990year
Short summary
ACL-deficient patients activate hamstring muscles significantly earlier than controls when walking uphill, suggesting altered muscle coordination for knee stability.
AI-generated from the title and abstract; the full text is not read.
Key points
- Hamstring muscle activation timing differs between ACL-deficient patients and controls during uphill walking.
- ACL-deficient patients show earlier hamstring activation when knee load is increased (uphill walking).
- No significant difference in muscle activity was observed during level walking.
- Altered muscle coordination is proposed as a mechanism for knee stability in ACL deficiency.
AI-generated from the title and abstract; the full text is not read.
Abstract
Recent studies indicate that the hamstrings are essential antagonists in ACL deficient patients. In order to evaluate muscle coordination under physiologic conditions, nine patients with arthroscopically verified total ACL ruptures were compared with nine control volunteers. This comparison was made from electromyograms of the thigh muscles and heel contact recordings made while walking on a treadmill. While walking on a horizontal level, the patient's muscle activity did not differ from controls, but when the knee load was increased by walking uphill, the hamstring muscles in patients were activated significantly earlier than among controls. It is proposed that an altered muscle coordination is probably essential in ACL deficient patients to secure knee stability. This study suggests a new approach to investigate the coordination of muscles under physiologic conditions in ACL deficient patients, and may guide rehabilitation programs in the future.
The authors' abstract, as published at the source. The American Journal of Sports Medicine, 1990 · DOI ↗
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Field: Surgery
SurgeryMedicine