Relationship between Tibial Baseplate Design and Rotational Alignment Landmarks in Primary Total Knee Arthroplasty

Table 1

Tibial component design families used in this study.

Design	A	B
Type	Symmetric	Anatomic
# sizes	10	9
ML size range (mm)	58.4–89.0	57.7–88.1
ML increments (mm)	0–8.0	3.0–5.1
AP increments (mm)	−1.5 to 4.0	1.8–3.3

Negative increment (−1.5 mm) exists only between sizes 8 and 9.
Increases asymmetrically between medial and lateral compartment.