Many surgeons and patients prefer bilateral total knee arthroplasty (TKA) under one anesthesia as single-stage administration. A single-stage bilateral TKA can be performed in two different ways: single-stage, two-team simultaneous bilateral TKA (two surgeons bilateral TKA), and single-stage, a sequential bilateral TKA (single surgeon bilateral TKA). The purpose of this study is to evaluate the radiological results in the single-stage bilateral TKA in terms of two surgeons bilateral TKA and single surgeon bilateral TKA.

Investigators will enroll 136 participants with primary bilateral symptomatic knee osteoarthritis that will refractory to conservative treatment who will undergo bilateral TKA under single anaesthesia after 15.06.2020. Investigators will include patients who were less than 75 years old, with no history of malignancy, without severe extra-articular deformities, and without the systemic inflammatory disease, severe cardiac insufficiency, and morbid obesity (>40 kg/m2 or 35 or more and experiencing obesity-related health conditions). An informed consent form will be obtained from all patients.

Inclusion Criteria:

Primary bilateral knee osteoarthritis with refractory to conservative treatment Patients who accept participation in the research and the randomization

Exclusion Criteria:

no history of malignancy less than 75 years old without severe extra-articular deformities severe cardiac insufficiency and morbid obesity without systemic inflammatory diseases