The recovery process after knee replacement surgery begins with the patient standing up immediately after the operation. Typically, they can start climbing stairs within one or two days. Independent walking without a cane is usually possible after two weeks. However, for full functional recovery and gaining muscle strength, it is crucial to continue regular walking and physical therapy exercises for up to six months post-surgery. As most patients experience pre-operative muscle weakness, strengthening these muscles through exercises is critically important for a successful recovery.