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Table 4 Change in MRI before ESWT and at 10-year follow-up

From: High-energy extracorporeal shock wave therapy for nontraumatic osteonecrosis of the femoral head

 

Improved

Unchanged

Progressed

Collapsed

ARCO stage I

 Ia

2

5

0

0

 Ib

1

0

0

0

 Ic

0

0

0

0

Total

3

5

0

0

ARCO stage II

 IIa

0

1

1

0

 IIb

6

3

3

1

 IIc

5

3

6

2

Total

11

7

10

3

ARCO stage III

 IIIa

0

1

3

1

 IIIb

0

0

1

1

 IIIc

0

0

3

3

Total

0

1

7

5