Table 1.

Algorithm to correct isolated malalignment and asymmetric medial and lateral gaps.

	Isolated asymmetric mediolateral tightness/laxity
	Extension		Flexion
	Medial	Lateral	Medial	Lateral
CAS data readout & clinical assessment	Tight medial extension gap: relative valgus to predicted stress HKA. <1 mm stress gap medially. Difficulty inserting poly/spacer block due to medial tightness	Tight lateral extension gap: relative varus to predicted stress HKA. <1 mm stress gap laterally. Difficulty inserting poly/spacer block due to lateral tightness	Tight medial flexion gap: relative valgus to predicted stress HKA. <1 mm stress gap medially. Poly spits out medially in flexion/difficulty inserting spacer block	Tight lateral flexion gap: relative varus to predicted stress HKA. <1 mm stress gap laterally
	Loose medial extension gap: relative varus to predicted stress HKA. >2 mm medial stress gap. Alignment corrected with valgus stress force	Loose lateral extension gap: relative valgus to predicted stress HKA. >3 mm lateral stress gap. Alignment corrected with varus stress force	Loose medial flexion gap: relative varus to predicted stress HKA. >2 mm medial stress gap. Alignment corrected with varus stress force	Loose lateral flexion gap: relative valgus to predicted stress HKA. >5 mm lateral stress gap. Alignment corrected with valgus stress force
Surgical solution	Tight medial extension gap: resect additional 1° = 1 mm resection off the medial femoral condyle	Tight lateral extension gap: resect additional 1° = 1 mm resection off the lateral femoral condyle	Tight isolated medial flexion gap: externally rotate the femur pivoting off the lateral condyle—resect more bone off the medial posterior condyle	Tight isolated lateral flexion gap: internally rotate the femur pivoting off the medial condyle—resect more bone off the lateral posterior condyle
	Loose medial extension gap: underresect by 1° = 1 mm less resection off the medial femoral condyle	Loose isolated lateral extension gap: underresect by 1° = 1 mm less resection of the lateral femoral condyle	Loose isolated medial flexion gap: internally rotate (IR) the femur pivoting off the lateral femoral condyle, ie, resect 1 mm less bone off the medial posterior condyle but keep lateral condylar resection unchanged	Loose isolated lateral flexion gap: externally rotate (ER) the femur pivoting off the medial femoral condyle, ie, resect 1 mm less bone off the lateral femoral condyle but keep medial condylar resection unchanged