Complex sentence: In fractures with little or no displacement, immobilization for 4 to 6 weeks may be sufficient, but other cases need surgery, using pins, wires, screws only, or plates and screws.
Split into simpler sentences: In fractures with little or no displacement, the immobilization for 4 to 6 weeks can be sufficient. But for the rest of the cases it needs surgery, using: pins, wires, screws only or plates and screws.