The role of subchondral bone in joint disease: a review.
Authors: Kawcak C E, McIlwraith C W, Norrdin R W, Park R D, James S P
Journal: Equine veterinary journal
Summary
# Editorial Summary: The role of subchondral bone in joint disease Subchondral bone dysfunction represents a critical yet understudied component of osteochondral disease in athletic horses, alongside the more commonly investigated articular cartilage pathology. This review synthesises existing evidence on how subchondral bone contributes to the development of osteochondral fragmentation, subchondral necrosis and osteoarthritis across species, with particular application to equine practice. The authors highlight a significant gap in our knowledge: whilst research has extensively documented articular cartilage degradation, comparatively little attention has been paid to understanding subchondral bone pathology or how coordinated failure of the osteochondral unit develops. Current understanding remains largely descriptive, based on clinical observations and post-mortem findings, with limited objective mechanistic studies of how joint tissues adapt and fail under athletic demand. For practitioners managing performance horses with joint disease, this review underscores the importance of viewing osteochondral pathology as an integrated process rather than isolated cartilage damage, though closing the research gap on subchondral bone mechanics will be essential for developing more effective preventative and therapeutic strategies.
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Practical Takeaways
- •Recognize that joint disease in athletic horses involves both cartilage and subchondral bone; addressing only cartilage pathology may be insufficient for treatment and prevention.
- •Work with veterinarians to understand that osteochondral lesions require comprehensive assessment of bone quality and structure, not just surface cartilage evaluation.
- •Consider subchondral bone integrity when evaluating horses with recurrent joint problems, as bone remodeling and adaptation may be key factors in chronic osteoarthritis.
Key Findings
- •Subchondral bone plays an integral role in the pathogenesis of osteochondral damage and osteoarthritis in both horses and humans.
- •Osteochondral fragmentation, fracture, and subchondral bone necrosis are common diseases in athletic horses.
- •Current understanding of osteochondral disease is primarily based on clinical and pathological sources rather than mechanistic studies of joint tissue adaptation.
- •Comparatively little research effort has focused on subchondral bone pathology relative to articular cartilage damage despite their coordinated disease states.