ROCK OCD Arthroscopy Classification - Osteochondritis.
Marlovits et al., Osteochondritis dissecans of the knee 29 The most useful diagnostic feature of MRI is its ability to distinguish between stage II and stage III lesions.
Osteochondritis Dissecans is a condition where loose fragments of bone and cartilage break off the end of a bone when the blood supply to the bone is reduced. It most commonly affects the knee (75% of cases) but can also affect the elbow, ankle, shoulder, hand, wrist or hip.
OCD of the knee can be subdivided into two for-ms: juvenile osteochondritis dissecans (JOCD) and adult osteochondritis dissecans (AOCD), according to whether it occurs in patients with an open or closed growth plate, respectively (2). The distinction between the two forms is important from the point of view of treatment and prognosis.
FIGURE 1. Anatomic classification of knee osteochondritis dissecans based on lesion location on anteroposterior (A) and lateral (B) radiographs. Note the “classic” location denoted. The Blumensaat line is a condensed linear shadow on lateral radiographs of the knee that provides an indication of relative position of the patella.
Osteochondritis Dissecans Case presentation A 56 year old woman presents with 3 day history of gradually worsening pain and swelling in her left knee.Denies any injury,temperature or other complaints.Never experienced this type of pain before and states that she is fairly active and fit.Vital signs normal.On examination of the knee,noted slight effusion and slightly limited range of motion.
Controversy surrounds the aetiology of osteochondritis dissecans of the knee. Causes including inflammation, genetic predisposition, ischaemia, a defect in ossification, and repetitive trauma have been postulated, but there are insufficient data to conclusively support any of these.
Osteochondritis dissecans is an acquired, potentially reversible idiopathic lesion of subchondral bone resulting in delamination and sequestration with or without articular cartilage involvement and instability. Clanton TO, DeLee JC.