Table 4.

Comparison in means of safety values.

	Group 1(n = 18)	Group 2(n = 16)
	Mean ± S.D.Median (Min–Max)	Mean ± S.D.Median (Min–Max)	t/U	p
Safety score	19.93 ± 0.3820 (19–20)	19.56 ± 0.5120 (19–20)	105.000**	0.187
Scratching of glenoid cartilage	0.012 ± 0.0130.006 (0–0.044)	0.021 ± 0.0180.142 (0.001–0.069)	94.000**	0.088
Scratching of glenoid cartilage score	10.00 ± 0.0010 (10–10)	9.88 ± 0.3410 (9–10)	126.000**	0.551
Scratching of humerus cartilage	0.029 ± 0.0170.027 (0.000–0.060)	0.043 ± 0.0180.038 (0.017–0.089)	-2.095*	0.044
Scratching of humerus cartilage score	9.83 ± 0.3810 (9–10)	9.69 ± 0.4810 (9–10)	123.000**	0.484

* t test.