Accuracy of Implant Placement Utilizing Customized Patient Instrumentation in Total Knee Arthroplasty

Table 1

Mean absolute difference between the planned (CPI) and ideal (traditional TKA) placement of the femoral and tibial components. Asterisk denote statistical significance (paired t-test two tailed).

	CPI cohort	Traditional TKA cohort	P value
	Mean (SD, range)	Mean (SD, range)
Femur
Coronal*	0.8° (±0.6°; −1.0° to 1.5°)	1.5° (±1.6°; −3.9° to 2.9°)	P < 0.01
Sagittal*	1.2° (±0.9°; −4.4° to 2.4°)	2.3° (±1.3°; −2.5° to 4.7°)	P < 0.001
Tibia
Coronal	1.0° (±1.0°; −1.6° to 1.7°)	1.8° (±1.6°; −3° to 6.4°)