The elephant knee joint: morphological and biomechanical considerations

Area of Science:

• Veterinary Anatomy
• Biomechanics
• Comparative Morphology

Background:

• Elephant limbs possess unique morphology for supporting immense body weight.
• Knee joint anatomy and function in elephants are poorly understood, despite frequent arthrosis.
• Existing data lack comprehensive functional analyses of the elephant knee.

Purpose of the Study:

• To investigate the anatomical structures of the elephant knee joint.
• To analyze the functional aspects of elephant knee biomechanics.
• To compare elephant knee peculiarities with human knees, particularly concerning arthrosis.

Main Methods:

• Standard anatomical techniques on eight African and three Asian elephants.
• Radiography and magnetic resonance imaging (MRI) for structural examination.
• Kinematic and functional analyses using a digitizer and helical axis concept.

Main Results:

• Elephant knee joints exhibit an extended resting position, unlike other quadrupeds.
• High femorotibial joint congruency with narrow, thin menisci was observed.
• The four-bar mechanism of cruciate ligaments is present; arthrosis can damage the cranial cruciate ligament.

Conclusions:

• Elephant knee joints have specialized features for weight support and locomotion.
• Understanding elephant knee biomechanics is crucial for managing arthritic conditions.
• Comparative analysis highlights unique adaptations and potential pathologies in elephant knee joints.