Describe Traction — Types & Uses in detail.

WHY Traction Works — and WHY its Role Has Shrunk

A useful piece of context is understanding why traction, once the mainstay of fracture treatment, is now largely a temporary measure — and where it still has a genuine place. Traction applies a sustained longitudinal pull to a limb, which (1) reduces the fracture by ligamentotaxis — the intact soft-tissue envelope pulls the fragments into alignment as the limb is lengthened; (2) holds that reduction; (3) overcomes the powerful muscle spasm that causes shortening (the thigh muscles after a femoral fracture are strong enough to override any manual reduction); and (4) relieves pain by immobilising the fragments. Its great disadvantage is that it demands prolonged bed rest — which in a modern hospital is unacceptable, and which brings its own train of complications: chest infection, DVT and pulmonary embolism, pressure sores, muscle wasting, joint stiffness, osteopenia and prolonged admission. Since internal fixation now allows early mobilisation, traction has been largely superseded. But it retains a real role: as a temporary measure before surgery (a Thomas splint for a femoral fracture, which is excellent analgesia and can be applied at the roadside); in children (in whom fractures unite fast and remodel); and where surgery is unavailable or unaffordable — which in parts of India still matters.

WHY the Pin Sites Must Be Watched

A practical point that determines whether skeletal traction succeeds or ends in disaster is understanding why pin-site care is not a nursing detail but the crux of the treatment. A traction pin, and equally the pin of an external fixator, creates a direct, permanent channel from the outside world to the bone — bypassing every barrier the body possesses. Bacteria colonise the pin, and the constant micromotion of the pin against the skin and soft tissues creates an inflamed, exuding tract in which they multiply. If the infection is allowed to track along the pin into the bone, the result is pin-tract osteomyelitis — which loosens the pin (so the traction fails), and which may leave the patient with a chronic bone infection long after the fracture has healed. Hence: the pin must be inserted with strict asepsis, through a small incision (never by hammering a pin through skin under tension), avoiding neurovascular structures (the common peroneal nerve at the proximal tibia; the popliteal vessels at the distal femur), and with the skin released around the pin so that it is not under tension. And thereafter the sites are inspected and cleaned regularly; redness, discharge, pain or a loosening pin are treated promptly — with antibiotics, and, if necessary, by removing and re-siting the pin.

Skin traction is limited by what the skin can bear.

• Traction applies a sustained pull that reduces the fracture (by ligamentotaxis — the soft-tissue envelope pulls the fragments into line), holds the reduction, overcomes muscle spasm (powerful in the thigh), and relieves pain.
• Skin traction (adhesive strapping/foam to the skin, weight up to ~5 kg only — more will blister and shear the skin): temporary, or in children (e.g. Gallows/Bryant's traction for a femoral fracture under 2 years and under 12 kg — beware vascular compromise). Contraindicated over broken skin, in peripheral vascular disease and with skin allergy.
• Skeletal traction (a Steinmann pin or Denham pin through bone — upper tibia, distal femur, calcaneum): allows heavier weights and longer duration. Risks: pin-tract infection, pin loosening, nerve/vessel injury during insertion, and distraction leading to non-union.
• Types: fixed traction (against a fixed point — the Thomas splint: excellent temporary splintage and analgesia for a femoral fracture, and can be applied pre-hospital) and balanced/sliding traction (against a counterweight — e.g. Perkins' traction, which permits knee movement).
• Its role has shrunk because prolonged bed rest causes chest infection, DVT/PE, pressure sores, muscle wasting, joint stiffness and long admission — and internal fixation allows early mobilisation. It remains useful: as a temporary pre-operative measure, in children, and where surgery is unavailable. Monitor: neurovascular status, pin sites, skin, and X-rays (for over-distraction).