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This work aims at elucidating the role of MRI complementary T2 mapping in assessment of the articular knee cartilage for improving sensitivity of detection of early stage of osteoarthritis

Knee replacement surgery is a surgery designed to treat severe arthritis of the knee. However, as many as 20% of patients are not satisfied with the results of their surgery. To place the knee replacement in correct position, the kinematic alignment method, which tries to reproduce the patient normal anatomy, has shown promise in improving the satisfaction after knee replacement surgery. It is not known if using a robotic arm to assist in surgery is better than the traditional method when trying to recreate kinematic alignment. The goal of this study is to learn if robotic assisted surgery is better than traditional method for knee replacement done using kinematic alignment. The main questions the study tries to answer are: 1. Do the radiographs of kinematic knee replacement surgeries done with robotic assistance show better alignment than radiographs of kinematic knee replacements done with the traditional method? 2. Does robotic assisted kinematic knee replacement give better function to patients than traditional knee replacement done with kinematic alignment? 3. Does robotic assisted kinematic knee replacement decrease pain, improve knee movement and improve knee stability better than traditional knee replacement done with kinematic alignment? 4. Are there more complications with robotic assisted kinematic knee replacement in comparison to traditional kinematic knee replacement? 5. How long long does it take a surgeon to become good a performing a kinematic knee replacement using robotic assistance? Researchers will compare knee replacements done using a robotic to make the bone cuts, and compare it to the usual method using guides and manual instruments. All the knee replacements will be done using the kinematic alignment and with the same type of knee replacement prothesis. Participants will: * Have a knee replacement done with the kinematic alignment technique by an experienced surgeon, with or without robotic assistance during the surgery. * Visit the clinic before surgery, six weeks after surgery, three months, six months, twelve months and twenty-four months after the surgery. * Fill questionnaire, have their knee examined and have radiographs of their knee done at each visit.

With China gradually entering an aging society, the proportion of the elderly population is gradually increasing, and the number of patients with knee disease is also increasing year by year. Total knee arthroplasty is one of the effective methods for the treatment of joint disease, which can effectively relieve knee pain, restore function and improve the quality of life. The goal of total knee arthroplasty is to relieve pain, restore function and obtain a long service life. Whether total knee arthroplasty can obtain good alignment is very important for the postoperative recovery of patients. The alignment of lower limb sagittal position is of great significance for evaluating whether the crowd is straightened or not, and can also evaluate and guide the TKA in sagittal position. At present, there are few studies on the sagittal position of the lower limb, and there is no clear definition of whether the lower limb is extended in the sagittal position. At the same time, there is no clear method to evaluate whether the lower limb is extended in the sagittal position in normal people and patients with OA. Therefore, it is urgent to develop a classification standard for the sagittal extension of the lower limb, which can be used in clinical evaluation and TKA operation evaluation. This study will be carried out in the first medical center of the Chinese PLA General Hospital, and a total of about 400 people are expected to be enrolled.