Correlation between quantitative pivot shift and generalized joint laxity: a prospective multicenter study of ACL
David Sundemo1, Anna Blom2, Yuichi Hoshino3
1Department of Orthopaedics, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden. david.sundemo@outlook.com.
Summary
Generalized joint laxity shows a weak correlation with increased rotatory knee laxity in the healthy knee of ACL-injured patients. However, this association was not found in the injured ACL knees.
Area of Science:
- Orthopedic surgery
- Sports medicine
- Biomechanics
Background:
- Anterior cruciate ligament (ACL) injuries often lead to altered knee biomechanics.
- Generalized joint laxity is a potential contributing factor to knee instability.
- Quantifying rotatory knee laxity is crucial for understanding ACL injury and reconstruction outcomes.
Purpose of the Study:
- To determine if greater generalized joint laxity is linked to increased quantitative rotatory knee laxity.
- To investigate this association in both ACL-injured and contralateral knees.
Main Methods:
- Prospective cohort study involving 103 patients undergoing ACL reconstruction.
- Rotatory knee laxity measured preoperatively using pivot shift test with inertial sensors and image analysis.
- Generalized joint laxity assessed using the Beighton Hypermobility Score.
Main Results:
- A weak but significant correlation found between Beighton Score and pivot shift in the contralateral knee (r=0.235, p<0.05).
- Multivariate analysis showed higher odds of increased lateral translation in the contralateral knee for high Beighton Score group (OR 1.86).
- No significant correlations were observed between generalized joint laxity and rotatory laxity in ACL-injured knees.
Conclusions:
- Generalized joint laxity is weakly associated with increased rotatory laxity in the contralateral knee of ACL-injured patients.
- This correlation does not extend to the ACL-injured knee itself.
- Findings suggest generalized laxity may influence the healthy knee's stability post-ACL injury.
Keywords:
Anterior cruciate ligament reconstructionBeighton ScoreGeneralized joint hypermobilityGeneralized joint laxityImage analysis systemInertial sensorPivot shift testRotatory knee laxityMore Related Videos
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