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Related Experiment Videos

[Basic problems in the treatment with functional knee orthoses]

J Grifka1, H Jutka

  • 1Orthop. Univ.-Klinik, St. Josef-Hospital, Bochum.

Zeitschrift Fur Orthopadie Und Ihre Grenzgebiete
|May 1, 1994
PubMed
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Functional knee braces for anterior cruciate ligament (ACL) insufficiency often fail in practice. Many users experience brace dislocation and inadequate anterior tibial translation control, leading to knee instability during activity.

Area of Science:

  • Orthopedic biomechanics
  • Sports medicine
  • Rehabilitative technology

Context:

  • Functional knee orthoses are commonly prescribed for anterior cruciate ligament (ACL) insufficiency and post-operative management.
  • Biomechanical analyses reveal challenges in accurately replicating knee joint movement with current orthotic devices.
  • Existing knee braces may not adequately address the dynamic instability associated with ACL deficiency.

Purpose:

  • To investigate the practical efficacy and user-reported issues of functional knee orthoses in athletes with ACL insufficiency.
  • To identify specific failure points in the design and application of commonly used knee braces.
  • To evaluate the clinical performance of knee orthoses regarding joint stability and anterior tibial translation control.

Summary:

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  • A study involving athletes with ACL insufficiency using various functional knee orthoses (Lenox-Hill, C.Ti., Donjoy) identified significant practical usage problems.
  • Key issues include orthotic joint dislocation and insufficient control of anterior tibial translation, resulting in recurrent knee instability ('giving-way events') in 68% of cases.
  • These usage problems were found to be independent of the type of mechanical joint incorporated in the orthoses.

Impact:

  • Findings highlight a critical gap between the intended function of knee orthoses and their real-world performance for ACL-deficient individuals.
  • Results suggest a need for improved orthotic designs that offer better joint stability and anterior tibial translation control.
  • Clinical examination protocols should emphasize assessing orthosis fit, comfort, and stability to ensure effective patient outcomes and prevent secondary injuries.