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Related Experiment Videos

Diagnosing the acutely locked knee.

P Bansal1, D J Deehan, R J H Gregory

  • 1Newcastle General Hospital, Westgate Road, Newcastle upon Tyne, UK. parvin.bansal@ncl.ac.uk

Injury
|July 6, 2002
PubMed
Summary
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A history of injury, joint line tenderness, and effusion reliably identify mechanical causes of acutely locked knees. This aids in prompt surgical triage for patients needing knee intervention.

Area of Science:

  • Orthopaedic Surgery
  • Knee Biomechanics
  • Diagnostic Accuracy

Background:

  • Acutely locked knee is a common orthopaedic presentation.
  • Identifying the cause is crucial for appropriate management.
  • Distinguishing mechanical blocks from other causes is essential.

Purpose of the Study:

  • To observe the management of acutely locked knees.
  • To identify features predicting surgically remediable causes.
  • To establish diagnostic criteria for mechanical knee blocks.

Main Methods:

  • Prospective cross-sectional study of 50 patients with acutely locked knees.
  • Clinical examination and arthroscopy under general anaesthesia.
  • Analysis of history, examination findings, and surgical outcomes.

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Main Results:

  • 43 out of 48 patients (89.6%) had distinct mechanical pathologies.
  • A history of definite injury, localized joint line tenderness, and effusion were key predictors.
  • Four patients had degenerative changes only; two resolved without surgery.

Conclusions:

  • Mechanical causes of acutely locked knees can be consistently identified.
  • Specific clinical criteria (injury history, joint line tenderness, effusion) improve diagnostic accuracy.
  • These criteria facilitate prompt and appropriate patient triage and referral for surgical intervention.