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Official Journal of the Italian Society of Orthopaedics and Traumatology

Table 1 Modified Brooker staging system

From: Selective versus non-selective NSAIDs as prophylaxis for heterotopic ossification following hip arthroplasty: a meta-analysis

Class Radiographic findings
Grade 0 No sign of heterotopic ossification
Grade I Bony islands in the soft tissue around the hip
Grade II Exophytes in the pelvis or proximal end of the femur with at least 1 cm between opposing bone surfaces
Grade III Exophytes in the pelvis or proximal end of the femur with less than 1 cm between opposing bone surfaces
Grade IV Bony ankylosis between proximal femur and pelvis