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Author Spotlight: Investigating Early Events and Long-Term Effects of ACL Injuries for Osteoarthritis Progression
Published on: September 29, 2023
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High-grade rotatory knee laxity may be predictable in ACL injuries
Volker Musahl1, Jeremy Burnham2, Jayson Lian2,3
1UPMC Center for Sports Medicine, Department of Orthopaedic Surgery, University of Pittsburgh, 3200 S Water Street, Pittsburgh, PA, 15203, USA. musahlv@upmc.edu.
Summary
Lateral compartment acceleration and translation are moderately correlated in anterior cruciate ligament (ACL)-injured knees. This correlation is strongest in males with combined ACL and lateral meniscus tears, suggesting higher rotatory knee laxity.
Area of Science:
- Orthopedic surgery
- Sports medicine
- Biomechanics
Background:
- Rotatory knee laxity is a key concern in anterior cruciate ligament (ACL) injuries.
- Quantifying rotatory knee laxity using lateral compartment acceleration and translation is common, but their interrelationship is not fully understood.
- Understanding this relationship is crucial for accurate diagnosis and treatment planning.
Purpose of the Study:
- To investigate the correlation between lateral compartment acceleration and translation during pivot shift testing in knees with ACL injuries.
- To determine if this correlation differs based on concomitant meniscal tears or sex.
- To test the hypothesis that a correlation exists in ACL-injured knees, irrespective of sex, and is greatest in knees with combined ACL and lateral meniscus tears.
Main Methods:
- Prospective cohort study involving 77 patients undergoing primary ACL reconstruction.
- Data collected over 2 years across four international centers.
- Preoperative examination under anesthesia using Image Analysis software and surface-mounted accelerometers to measure lateral compartment acceleration and translation.
Main Results:
- A moderate correlation was found between lateral compartment acceleration and translation in ACL-injured knees (ρ=0.36, p<0.05), but not in uninjured knees.
- The correlation was moderate in ACL-injured knees with lateral meniscus tears (ρ=0.53, p<0.05) and in males (ρ=0.51, p<0.05).
- The strongest correlation was observed in males with combined ACL and lateral meniscus tears (ρ=0.75, p<0.05).
Conclusions:
- Lateral compartment acceleration and translation are moderately correlated in ACL-injured knees.
- This correlation is significantly higher in males with combined ACL and lateral meniscus tears.
- Elevated lateral compartment acceleration and translation in males may indicate high-grade rotatory knee laxity, warranting increased suspicion for concomitant lateral meniscus tears.
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