Radiographic systems to classify osteoarthritis vary by which joint is being investigated.
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Vertebral column
There are many grading systems for degeneration of intervertebral discs and facet joints in the cervical and lumbar vertebrae, of which the following radiographic systems can be recommended in terms of interobserver reliability:
Shoulder
The Samilson-Prieto classification is preferable for osteoarthritis of the glenohumeral joint.
Hip
Osteoarthritis of the hip joint may use the Tönnis classification:
The joint space between the femoral head and the superior acetabulum is normally at least 2 mm.
Knee
The Kellgren–Lawrence grade (or K-L system) is a scoring tool used to assess the severity of knee osteoarthritis on a plain radiograph. It was first proposed in 1957 by Drs. J.H. Kellgren and J.S. Lawrence.