1. Spiral fracture
of long bone of lower limb at this age needs surgery for speedy recovery. If undisplaced, it can be immobilised in cast for 6-8 weeks but knee stiffness
can occur, which might complicate a good functional return and delay weight bearing,
2. If you have undergone surgery and fracture was fixed by intramedullary nail - you can bear weight and start your routine activities by this time, after getting checked how your fracture is healing by a repeat Xray of your leg,
3. Plating of your fracture still requires guarded weight bearing and light activities for say 2 months then depending upon your fracture healing you can start your activities.
4. Once your fracture heals by 4-5 months you can carry all activities.
5. I would advise you to follow an orthopaedician opinion depending on the pattern of fracture healing.