Equine meniscal degeneration is associated with medial femorotibial osteoarthritis.
Authors: Dubuc J, Girard C, Richard H, De Lasalle J, Laverty S
Journal: Equine veterinary journal
Summary
# Editorial Summary: Equine Meniscal Degeneration and Femorotibial Osteoarthritis Despite the clinical prevalence of femorotibial joint disease in horses, little has been established about normal meniscal structure or how meniscal pathology contributes to osteoarthritis development. Dubuc and colleagues examined 14 menisci from healthy cadaveric joints and 30 from joints with established OA, grading macroscopic and microscopic degenerative changes across anatomical regions (cranial horn, caudal horn, and body) on both femoral and tibial surfaces. Partial tears appeared throughout all meniscal regions and surfaces in both normal and arthritic joints, though medial meniscal damage correlated significantly with medial compartment OA severity—global meniscal macroscopic scores showed strong positive correlation with osteophyte formation (r = 0.7, P = 0.002) and cartilage degeneration (r = 0.5, P = 0.03), with advanced OA joints displaying substantially worse meniscal scores than controls (P = 0.004). For practitioners, these findings suggest that meniscal integrity may be both a marker and potential driver of medial femorotibial disease progression, though whether degeneration initiates OA or develops secondary to it remains unclear; this distinction will be critical for guiding diagnostic imaging priorities and timing of intervention in lame horses with stifle involvement.
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Practical Takeaways
- •Meniscal degeneration appears to be associated with the severity of medial femorotibial osteoarthritis in horses, suggesting meniscal pathology should be considered when evaluating horses with OA in this joint
- •Early detection and monitoring of meniscal lesions may be important in managing femorotibial OA progression, though the causal relationship between meniscal damage and OA remains unclear
- •Further clinical research is needed to establish whether meniscal pathology is a primary driver of OA or a secondary consequence of joint disease
Key Findings
- •Partial meniscal tears were present in all three regions (cranial horn, caudal horn, body) and on both femoral and tibial surfaces of menisci from study joints
- •Positive correlation between medial meniscal macroscopic scores and osteophyte severity (r = 0.7, P = 0.002) and cartilage degeneration (r = 0.5, P = 0.03) in the medial femorotibial joint
- •Global medial meniscal macroscopic scores were significantly greater in advanced OA joints compared with control joints (P = 0.004)
- •Meniscal lesions were most frequently identified on the femoral surface of the cranial horn of the medial meniscus and body of the lateral meniscus