RESULTS	At 3 months after operation , postoperative effectiveness was assessed according to Macnab criterion , the excellent and good rate was 95.23 % in research group ( excellent in 13 cases , good in 47 cases , and fair in 3 cases ) and was 71.42 % in control group ( excellent in 7 cases , good in 38 cases , fair in 15 cases , and poor in 3 cases ) ; the research group was significantly superior to control group ( chi2 = 6.110 , P = 0.006 ) .\