Tourniquet use in total knee replacement does not improve fixation, but appears to reduce final range of motion

Figures & data

Figure 1. Flow diagram of participants.

Table 1. Patient characteristi

	Tourniquet n = 25	No tourniquet n = 23
Men / women	10 / 15	9 / 14
Age, mean (SD)	70 (8)	71 (6)
BMI, mean (SD)	29 (4.8)	28 (4.8)
Preoperative ROM (°), mean (SD)	109 (17)	113 (17)

Figure 2. The MTPM values (mm) at 2 years show a skewed distribution with outliers.

Figure 3. MTPM (mm) at 1 year, 2 years, and 1–2 years (log scale). Note that migration for 1–2 years is not the same as migration for 2 years minus migration for 1 year, as MTPM has no defined direction.

Table 2. RSA variables at 6 months, 1 year, and 2 years (x–, y–, z–translation and rotation). No variables showed a significant difference

		Translation						Rotation
		x		y		z		x		y		z
		mean	SD	mean	SD	mean	SD	mean	SD	mean	SD	mean	SD
6 months	T	–0.03	0.09	–0.09	0.22	0.06	0.10	0.05	0.38	0.01	0.23	0.01	0.22
	NT	–0.01	0.13	–0.11	0.31	0.10	0.15	0.05	0.64	0.01	0.21	0.08	0.79
1 year	T	–0.03	0.08	–0.10	0.25	0.07	0.09	0.02	0.39	0.01	0.23	0.06	0.25
	NT	–0.02	0.15	–0.12	0.27	0.11	0.15	–0.09	0.69	0.01	0.21	0.03	0.99
2 years	T	–0.14	0.46	–0.06	0.27	0.05	0.17	–0.21	1.51	–1.60	8.19	0.01	0.73
	NT	–0.07	0.22	–0.15	0.42	0.16	0.33	0.05	0.71	0.07	0.33	–0.56	1.33

T: tourniquet; NT: no tourniquet.

Figure 4. Pain during the first 4 days, expressed as the mean of all consecutive measurements.

Figure 5. Peroperative bleeding.

Figure 6. Blood loss (mL) according to the hemoglobin dilution method.

Figure 7. Range of motion.