Table 3.

Results of Doppler ultrasound

Preoperative ultrasound performance	Number
The piriformis muscle and sciatic nerve thickened	8
Only the sciatic nerve thickened	6
Sciatic nerve thinned	4
Sciatic nerve bundles not uniform in thickness	3
Superior gemellus muscle oedema and sciatic nerve thinned	2
Sciatic nerve distorted	2
Synovial hyperplasia	2
Sciatic cortex discontinuous and osteophyte formation	2
Gluteal muscle echo inhomogeneous with unclear Sciatic nerve border	1
Total	30