Comparing Surgical and Economical Parameters of Total Knee Replacement.

Randomized 1: ratio study comparing Medacta MyKnee surgical technique using Efficiency single
use instruments versus Stryker Navigation surgical techniques performed with conventional
instruments. MyKnee surgical technique patients will receive a CT scan of the surgical knee
which enables custom manufacturing of the MyKnee cutting blocks. Stryker Navigational
surgical technique patients will not require a CT scan. Both groups of patients will undergo
total knee arthroplasty.

Inclusion Criteria:

- Age 18 to 75 years 2) BMI ≤35 3) Undergoing unilateral total knee arthroplasty due to
osteoarthritis (primary or post-traumatic OA) with the Medacta GMK Sphere 4) Able and
willing to give consent and to comply with study requirements, including follow up
visit at 6 weeks

Exclusion Criteria:

- Is participating in another clinical study 2) Has inflammatory arthritis 3) Has knee
avascular necrosis 4) Has severe deformity, defined as greater than 15 degrees varus
or 10 degrees valgus relative to the mechanical axis. 5) Has retained hardware in the
knee that requires removal and interferes with TKA procedure 6) Has prior high tibial
osteotomy (HTO)