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Quantitative test of knee laxity in Chinese
1Department of Orthopedic Surgery, National Taiwan University Hospital, Taipei, R.O.C.
Journal of the Formosan Medical Association = Taiwan Yi Zhi
|October 1, 1993
Summary
This study measured anterior knee laxity in 100 Chinese males using an arthrometer. Results show minimal differences between right and left knees, suggesting comparison is useful for assessing ligament injuries.
Area of Science:
- Orthopedics
- Biomechanics
- Sports Medicine
Background:
- Anterior knee laxity is a key indicator of knee joint stability.
- Understanding normative laxity values is crucial for diagnosing ligamentous injuries.
- Instrumented arthrometry provides objective measurements of knee joint laxity.
Purpose of the Study:
- To quantify anterior knee laxity in a cohort of healthy Chinese males.
- To establish normative data for anterior displacement and anterior compliance index.
- To evaluate the comparability of right and left knee laxity measurements for clinical assessment.
Main Methods:
- One hundred Chinese males with no prior knee injuries were assessed.
- An instrumented knee arthrometer (MEDmetric KT-1000) was used to measure anterior laxity.
- Measurements included anterior displacement under specific forces and the anterior compliance index (ACI) at 20° flexion and 10° external rotation.
Main Results:
- Mean anterior displacement was 4.5 ± 2.0 mm (right) and 4.3 ± 1.9 mm (left).
- 84% of subjects had an anterior displacement difference (ADD) < 2 mm between knees.
- Mean anterior compliance index (ACI) was 0.85 ± 0.4 mm (right) and 0.78 ± 0.33 mm (left), with 93% having a difference < 0.5 mm.
Conclusions:
- Minimal and statistically insignificant differences exist between right and left knee laxity in healthy males.
- Comparison of right-left anterior displacement difference (ADD) and anterior compliance index (CID) can serve as a valuable reference in diagnosing ligamentous knee injuries.