Destruction of the hip is usually seen an average of 14 months after the onset of symptoms; however, no significant osteonecrosis, inflammatory change, bacteria or crystals are seen on histological evaluation.
Radiographs reveal progressive loss of joint space and subchondral bone. Eventually, there is flattening and deformity of the femoral head and superolateral subluxation of the femoral head. Mild sclerotic changes may be seen; however, there is minimal or absent osteophytosis.
Differential considerations include
- Septic arthritis
- Crystal-induced arthropathies