This injury requires surgery. No getting around it. If it is treated within 1 week of the injury, a simple repair of the torn ends can be done. We basically suture the ends of the tendon back together with very strong suture. If it is over 1 week, the ends of the torn tendon start to die and get mushy and stringy. Think horse tail. This repair may require more imaginative thinking using your good tendon as a graft over the bad tendon area. I have encountered some tendons with severe degeneration that required complete replacement with a cadaver tendon.
Recovery is 6 weeks non-weightbearing in a cast, then 3-4 weeks in a walking boot with physical therapy for several weeks to regain strength and gait confidence. Returning to non-weightbearing exercise can start when you are out of the boot. But running takes much longer.