CONDITION
Osteochondritis Dissecans (OCD)
Osteochondritis dissecans is a developmental condition affecting joint cartilage in growing dogs, where abnormal cartilage formation can lead to loose fragments within joints, causing pain and lameness, most commonly affecting the shoulder, elbow, stifle, or hock.
Why this matters now
OCD typically manifests in young, rapidly growing dogs between four and twelve months of age, though signs may appear later when cartilage fragments cause ongoing joint problems. Large and giant breed dogs are most commonly affected, with genetics and nutrition influencing development.
During rapid growth, cartilage that should transform into bone fails to develop normally in certain areas. This abnormal cartilage can crack or separate, creating loose pieces within the joint. These fragments cause inflammation, pain, and mechanical interference with joint movement. Without intervention, ongoing cartilage damage may lead to early-onset arthritis in the affected joint.
Signals & patterns
Early signals
Intermittent lameness
Lameness that comes and goes, often more noticeable after exercise or rest, typically affecting one leg.
Stiffness after rest
Dogs may appear stiff when first getting up but improve somewhat with gentle movement.
Reluctance to exercise
Decreased enthusiasm for walks or play compared to expected energy levels for the age.
Subtle gait changes
Shortening of stride or reluctance to fully extend the affected limb during movement.
Later signals
Persistent lameness
Lameness becomes more constant and less responsive to rest as joint damage progresses.
Joint swelling
Visible or palpable enlargement of the affected joint due to inflammation and fluid accumulation.
Muscle wasting
The muscles around the affected limb may appear smaller than those on the opposite side due to reduced use.
Pain on joint manipulation
Dogs may flinch, pull away, or vocalise when the affected joint is moved through its range of motion.
Click to read about the biological mechanisms
How this is usually investigated
Assessment combines clinical examination with imaging to confirm the diagnosis, identify the specific lesion location, and evaluate whether loose fragments are present.
Orthopaedic examination
Radiography
CT scan
MRI scan
Arthroscopy
Options & trade-offs
Management depends on whether loose fragments are present, lesion severity, and the degree of associated joint damage, ranging from conservative management to surgical intervention.
Rest and restricted activity
Limiting exercise to reduce mechanical stress on the joint while allowing potential healing
Trade-offs: May allow some lesions to stabilise; requires strict compliance; does not address loose fragments; outcome less predictable.
Weight management
Maintaining lean body condition to reduce joint stress
Trade-offs: Important adjunct to any approach; challenging in growing dogs needing nutrition; supports long-term joint health.
Anti-inflammatory medication
Reducing pain and inflammation while monitoring for improvement
Trade-offs: Provides comfort; does not address underlying problem; long-term use considerations in young dogs.
Arthroscopic surgery
Minimally invasive removal of loose fragments and debridement of abnormal cartilage
Trade-offs: Addresses mechanical issues; faster recovery than open surgery; requires specialist equipment and expertise.
Open surgical treatment
Traditional joint surgery for fragment removal when arthroscopy not available or suitable
Trade-offs: Effective for fragment removal; longer recovery period; greater tissue disruption than arthroscopy.
Cartilage repair techniques
Advanced procedures to encourage cartilage healing in some cases
Trade-offs: May improve long-term outcomes; limited availability; not suitable for all lesions; specialist centres only.
Common misconceptions
"OCD only affects very large breed dogs"
While large and giant breeds are most commonly affected, OCD can occur in medium-sized breeds and occasionally in smaller dogs, particularly in specific joints.
"Puppies with OCD will grow out of it"
OCD lesions do not resolve with growth alone; cartilage fragments can cause ongoing joint damage if not addressed appropriately.
"Surgery always leads to normal joint function"
While surgery often improves comfort and function significantly, some degree of early arthritis commonly develops in affected joints regardless of treatment.
Related conditions
Osteoarthritis in Dogs
Osteochondritis dissecans often progresses to osteoarthritis in affected joints, as the cartilage damage and loose fragments can accelerate degenerative changes in the joint surface over time.
Hip Dysplasia in Dogs
Hip dysplasia shares developmental origins with osteochondritis dissecans, both arising from abnormal joint development during growth, and the two conditions can occasionally occur together in the same animal.
Cruciate Ligament Disease in Dogs
Cruciate ligament disease can present with similar patterns of hind limb lameness when osteochondritis dissecans affects the stifle, and distinguishing between the two typically requires imaging of the joint structures.
Legg-Calvé-Perthes Disease
Legg-Calvé-Perthes disease involves disrupted blood supply causing bone death in the hip joint of small breeds, whereas osteochondritis dissecans involves abnormal cartilage development in larger dogs, but both cause joint pain and lameness during growth.
Obesity in Dogs
Obesity increases mechanical stress on joints affected by osteochondritis dissecans and can influence the progression of cartilage damage, while the pain and reduced mobility from osteochondritis dissecans may in turn contribute to weight gain.
Owners of young, growing large breed dogs noticing lameness or joint discomfort may recognise the possibility of developmental conditions like OCD. Understanding that early assessment can influence long-term outcomes helps frame decisions about when evaluation may be valuable.
Last reviewed: 24 April 2026 · Dr Alastair Greenway MRCVS