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Table 2 Results of Free Vascularized Fibula Grafting Using the Steinberg's Classification System.

From: Indications for free vascularized fibular grafting for the treatment of osteonecrosis of the femoral head

Stage

Hips with Excellent or Good Score (> 70)

Radiographic Progression

Conversion to THA

IB (n = 2)

2 hips

0

0

IC (n = 1)

1 hip

1 hip

0

IIA (n = 1)

1 hip

0

0

IIB (n = 3)

3 hips

0

0

IIC (n = 24)

20 hips

9 hips

1 hip

IIIB (n = 1)

1 hip

0

0

IIIC (n = 2)

0

2 hips

2 hips

IVA (n = 2)

2 hips

0

0

IVB (n = 8)

3 hips

4 hips

3 hips

IVC (n = 24)

14 hips

16 hips

5 hips

VC (n = 3)

0

3 hips

2 hips