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From: RETRACTED ARTICLE: High failure rate after Beta-tricalcium phosphate grafting for the treatment of femoral head osteonecrosis: a retrospective analysis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