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Meniscal movement. An in-vivo study using dynamic MRI
V Vedi1, A Williams, S J Tennant
1Department of Orthopaedics, St Mary's Hospital, London, England, UK.
The Journal of Bone and Joint Surgery. British Volume
|March 6, 1999
Summary
This study reveals how knee meniscus moves under load. Weight-bearing significantly impacts the anterior horn of the lateral meniscus, showing greater movement and height changes.
Area of Science:
- Orthopedics
- Biomechanics
- Medical Imaging
Background:
- Meniscal movement under physiological load is not well understood.
- Previous studies lacked in vivo imaging capabilities in functional positions.
Purpose of the Study:
- To investigate in vivo meniscal movement in normal knees under weight-bearing and non-weight-bearing conditions.
- To quantify the excursion, radial displacement, and height changes of meniscal horns.
Main Methods:
- Open MRI scanner used for near real-time imaging.
- 16 young footballers scanned during knee flexion (extension to 90 degrees).
- Measurements included meniscal horn excursion, radial displacement, and height.
Main Results:
- Significant differences observed in meniscal movement between weight-bearing and non-weight-bearing states.
- Lateral meniscus anterior horn showed the most pronounced changes in movement and height.
- Specific measurements detailed for anterior/posterior horns of medial and lateral menisci under both conditions.
Conclusions:
- Weight-bearing significantly influences meniscal kinematics, particularly the lateral meniscus anterior horn.
- This study provides crucial in vivo data on normal knee biomechanics.
- Findings may inform understanding of meniscal injuries and treatment strategies.
