Table 3.

Details of the postoperative changes in both groups (mean ± SD or number)

	Group A (n = 40)	Group B (n = 40)	P value
Free haemoglobin concentration (mg/l)
	173.5 ± 76.3	58.4 ± 29.1	t-test, P = 0.00
Increasing rate of circumference length of the knee (%)
3 days	7.3 ± 2.0	5.7 ± 2.6	t-test, P = 0.00
14 days	6.2 ± 1.8	5.0 ± 2.3	t-test, P = 0.01
Scope of ecchymosis (%)
	2.4 ± 0.7	0.9 ± 0.3	t-test, P = 0.00
Range of active knee flexion (°)
1 day	30 ± 12	44 ± 13	t-test, P = 0.00
3 days	47 ± 11	57 ± 18	t-test, P = 0.02
7 days	73 ± 15	75 ± 17	t-test, P = 0.21
Number of people conducting straight leg raising
1 day	16	26	x2, P = 0.025
3 days	20	32	x2, P = 0.005
7 days	29	34	x2, P = 0.17