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Related Experiment Videos

Hip isometric strength following knee surgery

J Jaramillo1, T W Worrell, C D Ingersoll

  • 1Krannert School of Physical Therapy, University of Indianapolis, IN 46227.

The Journal of Orthopaedic and Sports Physical Therapy
|September 1, 1994
PubMed
Summary

Following knee surgery, patients exhibit significant hip weakness across all major muscle groups. This study quantifies hip extensor weakness, recommending strength assessments and targeted exercises post-operation.

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Area of Science:

  • Orthopedics
  • Sports Medicine
  • Rehabilitation Science

Background:

  • Hip exercises are commonly recommended after knee surgery, assuming hip weakness.
  • Existing research lacks data to confirm hip weakness following knee injury or surgery.

Purpose of the Study:

  • To investigate and compare hip muscle strength in patients who have undergone knee surgery.
  • To provide objective data on hip strength deficits after knee trauma and surgical intervention.

Main Methods:

  • Isometric strength testing of hip flexors, extensors, abductors, and adductors.
  • Comparison of strength between surgical and non-surgical extremities in 27 patients pre-rehabilitation.

Main Results:

  • Significant hip weakness was observed in all four tested muscle groups of the surgical leg (11.9-25.3% deficit).
  • Both peak and endurance force production were diminished in the surgical hip.
  • Hip extension demonstrated the most pronounced weakness, with peak force reduced by 25.3% and endurance by 22.6%.

Conclusions:

  • Knee surgery leads to measurable weakness in multiple hip muscle groups.
  • Pre-rehabilitation hip strength assessment is crucial for patients post-knee surgery.
  • Targeted hip strengthening exercises should be considered to address identified deficits.

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