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Joint space narrowing, with or without subchondral sclerosis. Joint space narrowing is defined by this system as a joint space less than 3 mm, or less than half of the space in the other compartment, or less than half of the space of the homologous compartment of the other knee. II: Obliteration of the joint space III: Bone defect/loss < 5 mm IV
The typical changes seen on X-ray include: joint space narrowing, subchondral sclerosis (increased bone formation around the joint), subchondral cyst formation, and osteophytes. [54] Plain films may not correlate with the findings on physical examination or with the degree of pain. [55]
In most occurrences, there is only one joint affected, either the knee, the hip, or the elbow. Rarely involves the TMJ. [1] The cause is unknown. In this condition, cartilaginous metaplasia takes place within the synovial membrane of the joint. Metaplastic synovium organizes into nodules. With minor trauma, nodules are shed as small bodies into ...
Eburnation is a degenerative process of bone commonly found in patients with osteoarthritis or non-union of fractures.Friction in the joint causes the reactive conversion of the sub-chondral bone to an ivory-like surface at the site of the cartilage erosion. [1]
Osteosclerosis is a disorder characterized by abnormal hardening of bone and an elevation in bone density. It may predominantly affect the medullary portion and/or cortex of bone.
Proton density weighted MRI of a knee with synovial chondromatosis. There are multiple intra-articular loose bodies located in the suprapatellar recess. [5] Diagnosis is by medical imaging; X-ray, CT scan and MRI. [1] For diagnosis of the TMJ, Cone beam computed tomography (CBCT) can also be useful. [6]
In a tibial plateau fracture, any disruption of the posterior and anterior cortical rims of the plateau should be sought. Impaction of subchondral bone will appear as an increased sclerosis of the subchondral bone (Figure 1). In the hip, posterior acetabular fractures also present subtle radiographic findings.
Osteochondritis is a painful type of osteochondrosis where the cartilage or bone in a joint is inflamed. [1]It often refers to osteochondritis dissecans (OCD). The term dissecans refers to the "creation of a flap of cartilage that further dissects away from its underlying subchondral attachments (dissecans)".
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