From: RETRACTED ARTICLE: High failure rate after Beta-tricalcium phosphate grafting for the treatment of femoral head osteonecrosis: a retrospective analysis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