Table 2.

Accuracy of preoperative 2D templating

Deviation category	Both components*, n (%)	Femoral component, n (%)	Tibial component, n (%)
Exact (0)	106 (25)	220 (52)	176 (43)
± 1 size	345 (81)	390 (92)	373 (88)
± 2 sizes	416 (98)	424 (100)	414 (98)
± 3 sizes	424 (100)	424 (100)	424 (100)

^*“Both components” refers to a case-level measure, indicating that both the femoral and tibial component deviations fall within the specified category (e.g., “ ± 1 size” requires both components to be within ± 1 of the planned size). Deviation is defined as the absolute difference between planned and implanted size; narrow femoral components (e.g., 4 N) were classified according to their base size (e.g., 4 N → 4)