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os·te·o·chon·dri·tis dis·se·cans(os'tē-ō-kon-drī'tis dis'sĕ-kanz)
osteochondritis dissecansAn inflammatory disorder of joints in which small fragments of cartilage or bone are released into the interior of the joint, causing swelling, pain and limitation of movement. In some cases loose bodies may have to be removed.
König,Franz, German surgeon, 1832-1910.
osteochondritis dissecansfragmentation of cortical bone overlying an underlying focus of osteochondritis; fragment forms an intra-articular loose body; see osteochondrosis; Table 1
|Criterion 1||1. OC of the primary articular epiphysis (e.g. Freiberg's disease of the metatarsal head; Kohler's disease of the navicular)|
2. OC of the secondary articular epiphysis (e.g. osteochondritis dissecans of the talus)
3. OC of the non-articular epiphysis (e.g. Osgood-Schlatter disease of the tibial tuberosity; Iselin's disease of the styloid process of the fifth metatarsal)
|Criterion 2||1. Crushing apophysitis (e.g. Freiberg's disease) where the pressure of the base of the adjacent phalanx causes an 'eggshell fracture' of the affected metatarsal head|
2. Traction or distraction apophysitis (e.g. Sever's disease; Iselin's disease; Osgood-Schlatter disease) where traction at the tendon insertion distracts a secondary centre of ossification from the body of the calcaneum, fifth metatarsal or tibia respectively
3. Fragmentation apophysitis (e.g. osteochondritis dissecans) in which the cortical bone overlying the enchondral defect fractures and separates to create a loose body within the joint
|Two criteria may be used to classify osteochondritis:|
• criterion 1 relates to the anatomical location of the enchondral ossification defect
• criterion 2 relates to the effects on the diseased bone brought about by the local forces that act on the bone.
Patient discussion about osteochondritis dissecans
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