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Table 1 Demographic characteristics of patients with NONFH

From: High failure rate after Beta-tricalcium phosphate grafting for the treatment of femoral head osteonecrosis: a retrospective analysis

Total patient number47 hips (33 patients)
Mean age at surgery36 years (23–49 years)
Gender ratioMale/Female = 27/6
Involved hipUnilateral/Bilateral = 19/14
Risk factors
 Corticosteroid19 patients (26 hips)
 Alcoholism11 patients (17 hips)
 Idiopathic3 patients (4 hips)