Unless you have had a ligament reconstruction, you should be able to return to most physical activities after 6 to 8 weeks, or sometimes much sooner. Higher impact activities may need to be avoided for a longer time. You will need to talk with your doctor before returning to intense physical activities.
If your job involves heavy work, it may be longer before you can return to your job. Discuss when you can safely return to work with your doctor.
The final outcome of your surgery will likely be determined by the degree of damage to your knee. For example, if the articular cartilage in your knee has worn away completely, then full recovery may not be possible.You may need to change your lifestyle. This might mean limiting your activities and finding low-impact exercise alternative.