Months

Nocturnal paraesthesias

Functional impairment

3

Surgery

61.3

40.0

Injection

86.7

73.5

RR (95% CI)

0.706 (0.582 - 0.857)

0.544 (0.404 - 0.733)

P

0.001

0.001

6

Surgery

68.8

58.8

Injection

69.9

65.1

RR (95% CI)

0.984 (0.802 - 1.207)

0.903 (0.706 - 1.150)

P

1

0.424

12

Surgery

73.8

65.0

Injection

61.4

48.2

RR (95% CI)

1.200 (0.968 - 1.488)

1.349 (1.025 - 1.776)

P

0.098

0.04