The minimal joint space width is measured between the femoral head and the nearest part of the acetabular sourcil (representing the weight-bearing surface) 29. ESR <20 mm/h) can be used as an indicator of osteoarthritis 13. Hip joint space width ≤2 mm or <2.5 mm 10-12 or the combination of joint space narrowing with the presence of osteophytes, in particular, in the absence of any elevated inflammatory markers (e.g. Plain radiographs of the hip are a cheap, widely available and easily obtained modality and their interpretation in the evaluation of osteoarthritis is not as difficult as other imaging modalities 8-10.įor the indication of osteoarthritis of the hip, an anteroposterior radiograph of the hip and a cross-table lateral or frog-leg lateral view are obtained. Subchondral cyst formation and remodeling of the articular surfaces or deformity are seen in more advanced stages. General features are osteophyte formation, joint space narrowing and sclerosis of the subchondral bone plate. Osteoarthritis of the hip can be classified into primary and secondary, depending on whether it is due to a known predisposing factor or not. iatrogenic, e.g. multiple intra-articular steroid injections.The disease not only affects the hyaline cartilage, which loses its structural integrity due to composition changes but also involves the other tissues of the joint including the subchondral bone, the joint capsule and the synovium as well as the ligaments and the periarticular muscles 1. This arises from an imbalance between the destruction and repair of the affected tissues. Osteoarthritis is characterized by an active progressive alteration of the whole synovial joint, due to a combination of mechanical, inflammatory and metabolic factors. Other symptoms include locking, grinding and joint instability, fatigue and pain-related psychological stress 1,8. It can be associated with stiffness particular in the morning or after rest. The pain can be worse at night, at rest or with strenuous activity, reducing the range of motion and limiting walking distance. Patients usually experience slowly progressive hip pain, or hip-related groin pain radiating into the thigh, buttocks or knee.
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