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

From: RETRACTED ARTICLE: High failure rate after Beta-tricalcium phosphate grafting for the treatment of femoral head osteonecrosis: a retrospective analysis

ARCO stage Before operation (hips) At last follow-up (hips) P value
IIb 8 1 0.03
IIc 16 2 0.01
IIIa 23 9 0.02
IIIb, IIIc, and IV 0 35 <  0.001