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Related Experiment Videos

Knee strength after total knee arthroplasty.

Mauricio Silva1, Eric F Shepherd, Walter O Jackson

  • 1Joint Replacement Institute at Orthopaedic Institute, Los Angeles, CA 90007, USA.

The Journal of Arthroplasty
|August 23, 2003
PubMed
Summary

Total knee arthroplasty (TKA) patients show significantly reduced knee strength, impacting function. Improved rehabilitation may enhance recovery and strength in TKA recipients.

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Area of Science:

  • Orthopedics
  • Biomechanical Engineering
  • Rehabilitation Science

Background:

  • Total knee arthroplasty (TKA) is a common procedure for end-stage knee osteoarthritis.
  • Post-surgical outcomes are often influenced by residual muscle strength and functional recovery.
  • Quantifying strength deficits after TKA is crucial for optimizing rehabilitation strategies.

Purpose of the Study:

  • To evaluate isometric strength and functional performance in patients after TKA compared to healthy controls.
  • To identify factors influencing strength and function, such as age, BMI, and quadriceps-hamstring ratios.
  • To correlate objective strength measures with established functional outcome scores.

Main Methods:

  • Isometric extension and flexion peak torque were measured in 32 TKA patients and 52 healthy controls.

Related Experiment Videos

  • The hamstring to quadriceps (H/Q) strength ratio was calculated.
  • Knee Society Functional Scores were obtained and correlated with strength parameters.
  • Subgroup analyses were performed based on age (>/=70 years) and body mass index (BMI).

    • Main Results:

    • TKA patients exhibited significantly lower isometric extension (up to 30.7%) and flexion (32.2%) peak torque compared to controls.
    • Knee Society Functional Scores positively correlated with extension torque and negatively with the H/Q ratio.
    • Greater relative quadriceps strength was linked to better functional outcomes.
    • Older TKA patients and those with higher BMI showed reduced extension torque and relative quadriceps weakness, respectively.

    Conclusions:

    • Significant strength deficits persist more than 2 years after TKA, affecting functional outcomes.
    • Quadriceps strength is a key determinant of functional recovery post-TKA.
    • Targeted rehabilitation focusing on quadriceps strengthening and optimizing H/Q ratios may improve functional results after TKA.