Quantification of equine stifle passive kinematics.

Area of Science:

• Veterinary biomechanics
• Equine orthopedics
• Comparative joint kinematics

Background:

• The equine stifle joint is susceptible to degenerative diseases.
• Understanding stifle passive kinematics is crucial for diagnosing and treating these conditions.
• Objective data on healthy equine stifle motion is limited.

Purpose of the Study:

• To quantitatively characterize the passive kinematics of the healthy equine stifle.
• To provide an objective foundation for understanding stifle disorders.
• To explore potential surgical treatments for equine stifle degenerative disease.

Main Methods:

• Utilized 5 whole-horse specimens.
• Employed reflective markers with bone pins and a motion capture system.
• Calculated stifle joint kinematics (rotation, translation) during passive extension.

Main Results:

• Observed 107.5° ± 7.2° of motion, including tibial external rotation and adduction.
• Lateral femoral condyle showed significantly greater cranial translation than the medial (P = .01).
• No significant difference in cranial/caudal translation of estimated joint contact centroids between compartments (P = .16).

Conclusions:

• Equine stifle kinematics share similarities with human, sheep, and dog stifles.
• Findings suggest potential to translate human knee arthroplasty knowledge to equine stifle treatment.
• Establishes a baseline for future research into equine stifle pathology and surgical interventions.