Table 2.

VAS scores in included studies

Study	Pre	Post	P value	Follow-up	Pain relief rate
Minimal
Pizzoli et al. [20]	8.62 (±0.71)	2.84 (±1.36)	NA	24 h	98%
Chen et al. [21]	8.9 (±0.93)	2.6 (±1.71)	P < 0.001	NA	94%
Qian et al. [22]	7.4 (±2.1)	3.8 ( ±1.6)	P < 0.001	24 h	NA
		3.2 (±1.0)	P < 0.001	6 months	NA
Farrokhi et al. [15]	8.23 (NA)	2.12 (NA)	P ≤ 0.05	24 h	NA
		1 (NA)	P ≤ 0.05	2 months	NA
Tseng et al. [23]	8.1 (±0.67)	3.8 (±1.9)	P < 0.015	24 h	NA
		2.8 (±2.0)	P < 0.001	6 months	NA
Yang et al. [16]	8.78 (±0.54)	5.41 (±0.94)	P = 0.032	6 months	95.00%
Pflugmacher et al. [17]	8.3 (±15)	3.3 (±9)	P < 0.0001	3 months	NA
Anselmetti et al. [18]	10 (±1)	1 (±0.75)	P < 0.001	1 month	100.00%
Open
Holman et al. [24]	7 (NA)	2 (NA)	P < 0.001	1 month	94%
Chong et al. [25]	6.5 (±1.7)	3.4 (±1.6)	NA	2 weeks	NA
Eid et al. [26]	NA	NA	NA	1 month	96%
Liang et al. [27]	6 (NA)	2 (NA)	P < 0.001	12 months	90%
Wonik Cho et al. [28]	7.86 (±1.05)	4.48 (±2.09)	P = 0.001	NA	NA
Walter et al. [29]	6.9 (±1.6)	3.1 (±1.0)	P < 0.001	1 month	87.70%
Dae-Chul Cho et al. [30]	6.82 (±2.13)	3.61 (±1.01)	NA	1 month	NA
Shehadi et al. [31]	6 (NA)	2 (NA)	P < 0.001	1 month	NA
Street et al. [19]	7.94 (NA)	4.3 (NA)	P < 0.001	NA	NA