Principles of Fracture Treatment
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Direct answer
Fracture treatment aims to restore anatomy, preserve blood supply and return the patient to function early. The classical sequence is reduction, immobilisation and rehabilitation, applied only after the whole patient has been assessed along ATLS lines. The choice between conservative splintage and operative fixation depends on the fracture pattern, stability, soft-tissue condition and patient factors.
What you must remember
- Fracture healing passes through haematoma, inflammation, soft callus, hard callus and remodelling; rigid internal fixation can produce primary healing without visible callus.
- The AO principles of operative fixation — anatomical reduction, stable fixation, preservation of blood supply and early active mobilisation — summarise surgical goals.
- Conservative options are closed reduction with a plaster of Paris cast, skin or skeletal traction and functional bracing; watch clinically and radiologically for redisplacement and cast tightness.
- Open fractures need urgent antibiotics, tetanus prophylaxis, saline irrigation and surgical debridement of non-viable tissue; the Gustilo-Anderson classification (types I to IIIC) grades severity and guides care.
- Compartment syndrome — pain out of proportion and pain on passive muscle stretch are the earliest signs; pulses vanish late; treat with emergency fasciotomy before Volkmann's ischaemic contracture develops.
- Fat embolism syndrome typically appears 24-72 hours after long-bone fractures with hypoxia, confusion and a petechial rash over the chest, axillae and conjunctivae.
- Define the terms precisely — delayed union, non-union (hypertrophic with abundant callus versus atrophic with none) and malunion; a pathological fracture occurs through abnormal bone.
Common confusion
Hypertrophic and atrophic non-union are the recurring trap. Hypertrophic non-union shows a bulky callus ring around a mobile fracture — biology is good but fixation is inadequate, so it needs rigid stabilisation. Atrophic non-union shows an avascular, sclerotic, gap-filled fracture with no callus — biology has failed, so it needs biological stimulation such as bone grafting as well as fixation. Also, do not confuse the two classics of timing: fat embolism at 24-72 hours versus compartment syndrome evolving over hours from a tight cast or crush injury.
Exam-focused takeaway
Definitions and eponyms dominate: the AO four principles, Gustilo-Anderson grades, the earliest sign of compartment syndrome (pain on passive stretch, not absent pulse) and the fat embolism triad with its timing window. Vignettes test the first step in an open fracture — antibiotic cover with tetanus prophylaxis alongside resuscitation — and the choice between conservative and operative management from fracture pattern and stability.
Frequently asked questions
What are the classical principles of fracture treatment?
Reduction of the fragments, immobilisation until union and rehabilitation of function. These follow initial whole-patient resuscitation and assessment of the soft tissues.
What are the AO principles of internal fixation?
Anatomical reduction, stable fixation, preservation of the blood supply to bone and early active mobilisation of the limb and patient.
What is the earliest sign of compartment syndrome?
Pain out of proportion to the injury, worsened by passive stretching of the compartment muscles. Pallor, pulselessness and paraesthesia are late findings.
How are open fractures managed initially?
Urgent antibiotics and tetanus prophylaxis, sterile saline irrigation and surgical debridement of devitalised tissue with timely skeletal stabilisation, documented by the Gustilo grade.
How do hypertrophic and atrophic non-union differ?
Hypertrophic non-union has abundant callus with inadequate stability and needs rigid fixation; atrophic non-union has no callus with poor vascularity and needs biological stimulation plus fixation.