Navigated non-image-based registration of the position of the pelvis during THR. An accuracy and reproducibility study

Figures & data

Figure 1. The OrthoPilot navigation system.

Figure 2. Results for pelvic inclination. [Color version available online.]

Figure 3. Results for pelvic rotation. [Color version available online.]

Figure 4. Results for pelvic flexion. [Color version available online.]

Table I.  Cutaneous palpation: inclination measurements. Paired Wilcoxon t-test.

	Second	Third
First	p = 0.40	p = 0.07
Second		p = 0.06

Table II.  Cutaneous palpation: rotation measurements. Paired Wilcoxon t-test.

	Second	Third
First	p = 0.64	p = 0.41
Second		p = 0.11

Table III.  Cutaneous palpation: flexion measurements. Paired Wilcoxon t-test.

	Second	Third
First	p = 0.18	p = 0.12
Second		p = 0.75

Table IV.  Cutaneous palpation: inclination measurements. Spearman correlation test.

	Second	Third
First	rho = 0.753	rho = 0.809
	p = 0.03	p = 0.02
Second		rho = 0.803
		p = 0.02

Table V.  Cutaneous palpation: rotation measurements. Spearman correlation test.

	Second	Third
First	rho = 0.870	rho = 0.809
	p = 0.01	p = 0.02
Second		rho = 0.833
		p = 0.01

Table VI.  Cutaneous palpation: flexion measurements. Spearman correlation test.

	Second	Third
First	rho = 0.936	rho = 0.927
	p = 0.005	p = 0.005
Second		rho = 0.876
		p = 0.01