Standardising the clinical assessment of coronal knee laxity

Jon V. Clarke, William T. Wilson, Scott C. Wearing, Frederic Picard, Philip E. Riches, Angela H. Deakin

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Clinical laxity tests are used for assessing knee ligament injuries and for soft tissue balancing in total knee arthroplasty. This study reports the development and validation of a quantitative technique of assessing collateral knee laxity through accurate measurement of potential variables during routine clinical examination. The hypothesis was that standardisation of a clinical stress test would result in a repeatable range of laxity measurements.Non- invasive infrared tracking technology with kinematic registration of joint centres gave real-time measurement of both coronal and sagittal mechanical tibiofemoral alignment. Knee flexion, moment arm and magnitude of the applied force were all measured and standardised. Three clinicians then performed six knee laxity examinations on a single volunteer using a target moment of 18 Nm.Standardised laxity measurements had small standard deviations (within 1.1°) for each clinician and similar mean values between clinicians, with the valgus laxity assessment (mean of 3°) being slightly more consistent than varus (means of 4° or 5°).The manual technique of coronal knee laxity assessment was successfully quantified and standardised, leading to a narrow range of measurements (within the accuracy of the measurement system). Minimising the subjective variables of clinical examination could improve current knowledge of soft tissue knee behaviour.

LanguageEnglish
Pages699-708
Number of pages10
JournalProceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
Volume226
Issue number9
Early online date3 Jul 2012
DOIs
Publication statusPublished - 1 Sep 2012

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Knee
Tissue
Knee Injuries
Arthroplasty
Knee Replacement Arthroplasties
Ligaments
Time measurement
Exercise Test
Biomechanical Phenomena
Standardization
Volunteers
Kinematics
Infrared radiation
Technology

Keywords

  • clinical assessment
  • knee laxity
  • ligament injuries
  • non-invasive assessment
  • total knee arthroplasty

Cite this

Clarke, Jon V. ; Wilson, William T. ; Wearing, Scott C. ; Picard, Frederic ; Riches, Philip E. ; Deakin, Angela H. / Standardising the clinical assessment of coronal knee laxity. In: Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine . 2012 ; Vol. 226, No. 9. pp. 699-708.
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Standardising the clinical assessment of coronal knee laxity. / Clarke, Jon V.; Wilson, William T.; Wearing, Scott C.; Picard, Frederic; Riches, Philip E.; Deakin, Angela H.

In: Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine , Vol. 226, No. 9, 01.09.2012, p. 699-708.

Research output: Contribution to journalArticle

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