Comparing Minimal Invasive Surgery en Conventional Total Knee Arthroplasty

Inclusion Criteria: * patient requiring Total Knee Arthroplasty (TKA) * patients with Osteo arthritis * intact collateral ligaments and patella tendon * patients willing and able to comply with the post-operative schedule Exclusion Criteria: * patients who require a revision TKA * patients with TKA contralateral knee within 6 months with bad outcomes * patients who need a TKA on contralateral side within 2 years * intraoperative resurfacing of patella * intraoperative eversion of patella * patients who had prior procedure of involved knee such as high tibial osteotomy, cruciate ligament recontruction, knee fusion or patellectomy * BMI \> 30 * patients with fixed flexion contracture\> 15 degrees * patients with deformity greater than 20 degrees of varus or 15 degrees of valgus * Patient with Mediolateral stability \> 10 degrees patient with active or suspected malignancy * patient with Rheumatoid arthritis * patient with systemic disease that would effect subject's wellfare or overall outcome of the study * patient with other severe concurrent joint involvement which can effect their outcome * patients with an immobile hip * patient with a history of Pulmonary embolism or Deep venous thrombosis