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Popliteus function in ACL-deficient patients

M J Weresh1, R H Gabel, R A Brand

  • 1Department of Orthopaedic Surgery, University of Iowa, Iowa City 52242, USA.

Scandinavian Journal of Medicine & Science in Sports
|February 1, 1997
PubMed
Summary
This summary is machine-generated.

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Anterior cruciate ligament (ACL) injuries can cause knee instability. This study found that the popliteus muscle shows minimal activity differences in ACL-deficient patients, suggesting it doesn't actively cause instability during common activities.

Area of Science:

  • Orthopedics
  • Biomechanics
  • Sports Medicine

Background:

  • Anterior cruciate ligament (ACL) injuries frequently lead to anterolateral rotary instability and the 'pivot shift' phenomenon.
  • The popliteus muscle's role in pivot shifts is debated, with some postulating its stimulation causes this instability.

Purpose of the Study:

  • To investigate whether patients with pivot shifts exhibit excessive popliteus muscle activity.
  • To determine the popliteus muscle's contribution to knee instability following ACL injury.

Main Methods:

  • Fine-wire electromyography (EMG) of the popliteus muscle was used.
  • 16 healthy subjects and 10 ACL-deficient patients were studied.
  • Subjects performed six activities: level walking/jogging, ascending walking/jogging, and descending walking/jogging.

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Main Results:

  • Popliteus muscle EMG signals showed only minor differences between injured and uninjured limbs across activities.
  • Variance ratios indicated similar pattern variability in both groups.
  • No significant excessive popliteus muscle activity was observed in ACL-deficient patients during the tested activities.

Conclusions:

  • The popliteus muscle does not appear to actively contribute to anterolateral rotary instability in ACL-deficient patients during the studied activities.
  • Findings challenge the hypothesis that popliteus muscle hyperactivity is a primary cause of pivot shifts.
  • Further research may explore other factors contributing to pivot shift phenomena.