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KA 3 AXIS.jpg

Stephen HOWELL


"KA co-aligns the axes and joint lines of the components with the three «kinematic» axes and joint lines of the pre-arthritic or native knee without placing restrictions on the pre-operative deformity and post-operative correction" [1]

The illustration demonstrates the three kinematic axes of the knee. Yellow line indicates the longitudinal axis in the tibia about which the tibia rotates on the femur. The green line indicates the transverse axis in the femur about which the tibia flexes and extends. The magenta line indicates the transverse axis in the femur about which the patella flexes and extends. FROM: Parisi T, Jennings J, Dennis D, Coronal Alignment in TKA: Traditional Principles Versus New Concepts, RECONSTRUCTIVE REVIEW, dec 2018, vol 8 num 3​ [2]



"The kinematic Alignment (KA) technique is a “true knee resurfacing” (fully anatomic positioning of TKA implants). Like partial replacement techniques for knee, KA technique is a “patient specific” and “ligament sparing” (bone procedure) technique striving to restore the highly inter-individual variable native pre-arthritic limb and joint line alignments and knee laxity without the need of any complex preoperative assess-ment or planning.

KA technique is a pure bone procedure with predictable “expected thickness of bone cuts”, and intraoperativeability to quality assurance check (caliper measurement) and correct them (varus-valgus recut instruments).

KA is a new surgical technique for TKA, which uses new landmarks to set the 3D ori-entation of the femoral and tibial implants. The only one similarity with the MA technique is the sagittal positioning of the femoral component, all the other steps are specific to KA technique" [2]

European KA Medacta Educational Board


"KA is a personalized joint line reconstruction through anatomic resurfacing, with no ligament releases"

1st KA Medacta EDU Board Meeting, Verona (Italy), 13th September 2019


1- Howell SM. Calipered Kinematically Aligned Total Knee Arthroplasty: An Accurate Technique That Improves Patient Outcomes and Implant Survival.Orthopedics. 2019 May 1;42(3):126-135.

2- Rivière C, Iranpour F, Auvinet E, Howell S, Vendittoli PA, Cobb J, Parratte S. Alignment options for total knee arthroplasty: A systematic review. Orthop Traumatol Surg Res. 2017 Nov;103(7):1047-1056.

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