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Rotational knee strain resulting in patellar dislocation. An experimental study in rabbits
Clinical Orthopaedics and Related Research
|September 1, 1982
Summary
Immobilizing the right hind leg of rabbits caused the opposite leg to rotate inward, leading to kneecap dislocation. This study explores the biomechanics of patellar dislocation in an animal model.
Area of Science:
- Orthopedics
- Biomechanical Engineering
- Veterinary Medicine
Background:
- Contralateral limb compensatory movements can lead to secondary musculoskeletal issues.
- Understanding the biomechanics of patellar instability is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the biomechanical consequences of unilateral lower limb immobilization in a rabbit model.
- To elucidate the mechanism of medial patellar dislocation in the contralateral limb.
Main Methods:
- Unilateral lower limb immobilization using a plaster spica in 64 young rabbits.
- Observation and analysis of gait patterns and lower limb kinematics.
- Histopathological examination to identify secondary bone formation.
Main Results:
- Immobilization induced internal tibial rotation and adduction in the contralateral limb.
- Medial patellar dislocation occurred in 32.8% (21/64) of the animals.
- Secondary exostosis formation was observed under the dislocated patella.
Conclusions:
- Unilateral limb immobilization can lead to contralateral patellar dislocation through altered joint mechanics.
- The findings suggest a potential mechanism for rotational instability and patellar dislocation in related human conditions like hip arthrodesis.
