Fig. 4

Distribution of tibial component size (medial, lateral, and anterior side) (a, b, c) and different alignment parameters (AP-TFA, AP-TA, and L-TA) (d, e, f) at 1 week after surgery. Tibial component sizes are classified into three groups: anatomically sized, 0 mm ≤ distance < 1 mm; under-hang, distance ≥ 1 mm; over-hang: mild over-hang, 1 mm ≤ distance < 3 mm, severe over-hang, distance ≥ 3 mm. AP-TFA, anteroposterior (AP) tibial-femoral anatomical angle, aligned: 183° ≤ angle ≤ 187.5°, varus: angle < 183°, valgus: angle > 187.5°; AP-TA, AP tibial angle, aligned: 87° ≤ angle ≤ 93°, varus: angle < 87°, valgus: angle > 93°; L-TA, lateral tibial angle, aligned: 83° ≤ angle ≤90°, misaligned: angle < 83°and angle > 90°.