Fracture Types & Healing

A fracture that looks stable on X-ray can still displace if you misunderstand its classification — and the healing timeline dictates every weight-bearing decision you'll make.

Fractures are classified by skin integrity (open vs. closed), fracture line pattern (transverse, oblique, spiral, comminuted), and displacement. An open (compound) fracture breaks the skin, creating infection risk — this is the single most urgent classification distinction because it changes the entire treatment trajectory. A closed (simple) fracture keeps skin intact. Comminuted fractures shatter into multiple fragments, common in older adults with osteoporosis, and heal slowest. Greenstick fractures (incomplete, one cortex) are pediatric. Healing follows four overlapping phases: hematoma formation (1–3 days), fibrocartilaginous callus (3 days–3 weeks), bony callus (3–12 weeks), and remodeling (months to years). Delayed union means healing hasn't progressed by expected timeframe; nonunion means healing has stopped entirely. Nursing assessment focuses on neurovascular status distal to the fracture — the 5 P's: Pain, Pulse, Pallor, Paresthesia, Paralysis. These checks drive early detection of complications covered in sibling atoms.

Key Distinctions

Don't confuse open (compound) with comminuted — open refers to skin integrity, comminuted refers to bone fragmentation. A fracture can be both. Students mix up callus formation (normal healing) with malunion (bone heals in wrong position). The 5 P's assessment belongs here at the fracture itself; compartment syndrome is a specific complication with its own diagnostic criteria covered separately.

Clinical Pearl

Open fracture = open skin = open door for infection. Cover it with a sterile saline dressing, never push bone back in, and anticipate surgical debridement and IV antibiotics.