An above-the-knee amputation involves surgically removing part or all of the leg above the knee. It may be required due to inadequate blood flow, severe infection, trauma, tumors, or congenital disorders. The surgery involves cutting the thigh bone after tying off arteries and veins, suturing muscles and skin. Post-operative care focuses on pain management, preventing infection and swelling, and beginning physical therapy soon after to prepare for mobility with a prosthesis or wheelchair. Complications can include infection, wound issues, swelling and pain, but with treatment many patients regain mobility.