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

Purpose: Identifies which joint is affected and assesses pain response to manipulation
Considerations: May require sedation for thorough evaluation; compares both limbs; evaluates range of motion.

Radiography

Purpose: Can reveal characteristic bone changes and some cartilage defects
Considerations: May show flattening or irregularity of joint surface; not all lesions visible; both limbs often imaged.

CT scan

Purpose: Provides detailed bone imaging to characterise lesion size and location precisely
Considerations: Requires anaesthesia; excellent bone detail; helpful for surgical planning.

MRI scan

Purpose: Visualises cartilage directly and identifies associated soft tissue changes
Considerations: Requires anaesthesia; shows cartilage damage not visible on X-ray; limited availability.

Arthroscopy

Purpose: Direct visualisation of joint interior allows both diagnosis and treatment
Considerations: Requires anaesthesia; minimally invasive; enables simultaneous fragment removal if indicated.

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

Misconception:

"OCD only affects very large breed dogs"

Reality:

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.

Misconception:

"Puppies with OCD will grow out of it"

Reality:

OCD lesions do not resolve with growth alone; cartilage fragments can cause ongoing joint damage if not addressed appropriately.

Misconception:

"Surgery always leads to normal joint function"

Reality:

While surgery often improves comfort and function significantly, some degree of early arthritis commonly develops in affected joints regardless of treatment.

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