Table 1.

Patient characteristics of the two groups

Patient characteristics	TiRobot group (n = 24)	Control group (n = 21)	P
Age (years, $\overline{\chi }$ ± s)	37.4 ± 6.6	39.8 ± 7.1	0.270
Gender (no.)			0.967
Male	15	13
Female	9	8
BMI (kg/m2, $\overline{\chi }$ ± s)	29.8 ± 2.4	28.9 ± 2.7	0.174
Injury mechanism (no.)			0.632
Fall	8	7
Motor	10	11
Crush	6	3
Tile classification (no.)			0.763
Type B	17	14
Type C	7	7
The duration from injury to operation (days, $\overline{\chi }$ ± s)	5.2 ± 2.1	5.7 ± 2.3	0.371