Osteochondritis Dissecans in Labrador Retrievers: The Growing-Puppy Joint Condition

During normal growth, cartilage at the ends of long bones gradually converts to bone as a puppy matures. In OCD, a section of this cartilage fails to convert properly and instead develops abnormally, sometimes forming a flap that can partially or fully detach from the underlying bone. This creates joint instability, inflammation, and pain, and if a cartilage fragment breaks loose entirely, it can float within the joint as what's sometimes called a 'joint mouse,' causing intermittent catching and worsening discomfort.

The shoulder is the most commonly affected joint in Labradors, though OCD can also occur in the elbow, hock, or knee. It typically develops during the rapid growth period of four to eight months old, and rapid growth itself — fueled by rich, high-calorie puppy food or genetics predisposing toward fast growth — is a documented contributing factor, alongside the underlying genetic predisposition toward the cartilage abnormality itself.

Diagnosis usually involves X-rays, sometimes supplemented with CT or arthroscopy for a clearer view of cartilage flaps that plain X-rays can miss, particularly in early or subtle cases. This matters because treatment decisions — rest versus surgical removal of the cartilage flap — depend heavily on how clearly the lesion can actually be visualized and characterized.

The right path depends on lesion size, joint involved, and whether the cartilage has already detached — here's the general decision pattern vets use.