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Table 4 Comparison of pre- and post-operative values in different AROC stages

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

ARCO stageBefore operation (hips)At last follow-up (hips)P value
IIb810.03
IIc1620.01
IIIa2390.02
IIIb, IIIc, and IV035<  0.001