A 28-year-old male carpenter from Delhi presents with wrist pain and swelling following a fall on an outstretched hand (FOOSH) injury. Clinical examination reveals tenderness in the anatomical snuffbox and a positive scaphoid compression test. Regarding scaphoid fracture management and complications, all of the following are true EXCEPT:

Explanation

## Analysis of Scaphoid Fracture Complications and Prognosis ### Blood Supply and Fracture Location **Key Point:** The scaphoid has a retrograde blood supply entering through a small dorsal branch, with the proximal pole being the most vulnerable to ischemia. The blood supply pattern determines healing potential: - **Distal pole**: Excellent blood supply → best prognosis, lowest nonunion rate (~5%) - **Waist**: Intermediate blood supply → intermediate prognosis (~10% nonunion) - **Proximal pole**: Poorest blood supply → worst prognosis, highest nonunion rate (~20–30%) and highest AVN risk ### Why the Correct Answer is Wrong **High-Yield:** Nonunion is MOST common in **proximal pole fractures**, NOT distal pole fractures. This is because the proximal pole has the most tenuous blood supply and is furthest from the entry point of the dorsal carpal branch. ### Imaging Modalities | Imaging Modality | Sensitivity for Occult Fracture | Timing | Clinical Use | |---|---|---|---| | Plain radiographs | 60–70% (initial) | Immediate | First-line | | CT scan | 95–100% | 2–3 weeks | Gold standard for nonunion | | MRI | 95–100% | 24–48 hours | Detects marrow edema early | | Bone scintigraphy | 90–95% | 72 hours | Historical, now replaced by MRI | **Clinical Pearl:** MRI is the most sensitive modality for detecting occult scaphoid fractures within 24–48 hours, making it ideal when clinical suspicion is high but radiographs are negative. ### Avascular Necrosis in Scaphoid Fractures **Key Point:** AVN occurs in 5–10% of scaphoid fractures, predominantly in proximal pole fractures due to retrograde blood supply being disrupted at the fracture site. Risk factors for AVN: - Proximal pole location - Delayed diagnosis and treatment - Nonunion - Smoking and poor compliance ### Summary Table: Scaphoid Fracture Prognosis by Location | Fracture Location | Nonunion Rate | AVN Risk | Blood Supply | Prognosis | |---|---|---|---|---| | Distal pole | ~5% | Rare | Excellent | Best | | Waist | ~10% | Low | Intermediate | Intermediate | | Proximal pole | 20–30% | High (5–10%) | Poor | Worst | **Warning:** Do not confuse distal pole fractures (best prognosis) with proximal pole fractures (worst prognosis). The proximal pole's retrograde blood supply makes it the Achilles heel of scaphoid healing.