Reliability of preoperative measurement with standardized templating in Total Knee Arthroplasty

Table 1 Suitability of the implant size

		Frequency	Percentage
Femur	Yes	29	58%
	No	21	42%
Tibia	Yes	25	50%
	No	25	50%

Yes: Same exact size; No: Size different than the measured one.

Table 2 Differences between the measured size and the size implanted in the femur and tibia

	Frequency	Percentage
Femur
-2 (2 sizes smaller)	2	4%
-1 (1 size smaller)	11	22%
0 (same size)	27	54%
1 (1 size larger)	8	16%
2 (2 sizes larger)	2	4%
Tibia
-2 (2 sizes smaller)	0	0%
-1 (1 size smaller)	11	22%
0 (same size)	24	48%
1 (1 size larger)	13	26%
2 (2 sizes larger)	2	4%

Table 3 Intraclass correlation coefficient inter- and intraobserver values

	Femur	Tibia
Observer 1	0.989	0.974
Observer 2	0.960	0.944
Before operation	0.994	0.942
After operation	0.943	0.863
ICC	0.735	0.806

Intraclass correlation coefficient (ICC) for intraobserver study. P < 0.001 (before vs after, observer 1 vs observer 2, measured vs implanted).