A 28-year-old male presents to the emergency department 3 days after a fall on an outstretched hand (FOOSH injury). He has tenderness in the anatomical snuffbox with pain on axial loading of the thumb. Plain radiographs (PA, lateral, and scaphoid views) appear normal. What is the most appropriate next step in management?

Explanation

## Clinical Scenario Analysis This patient presents with a classic **clinical suspicion of scaphoid fracture** — FOOSH mechanism, anatomical snuffbox tenderness, and pain on thumb axial loading — despite **normal initial radiographs**. This is a high-yield NEET PG scenario because 10–20% of scaphoid fractures are radiographically occult on initial imaging. ## Management Algorithm for Suspected Scaphoid Fracture ```mermaid flowchart TD A[FOOSH injury + snuffbox tenderness]:::outcome --> B{Radiographs show fracture?}:::decision B -->|Yes| C[Confirm with scaphoid views]:::action B -->|No, but high clinical suspicion| D[Immobilize in thumb spica cast]:::action D --> E[Repeat radiographs at 10-14 days]:::action E --> F{Fracture visible?}:::decision F -->|Yes| G[Continue immobilization per fracture type]:::action F -->|No, but persistent symptoms| H[MRI or CT for confirmation]:::action C --> I[Classify fracture: proximal/middle/distal]:::outcome I --> J{Displacement or comminution?}:::decision J -->|No| K[Conservative: thumb spica 8-12 weeks]:::action J -->|Yes| L[Surgical fixation]:::urgent ``` ## Key Point: The "Treat the Patient, Not the X-ray" Principle **High clinical suspicion + normal initial radiographs = immobilize and repeat imaging in 10–14 days.** This is the standard of care because: 1. **Fracture lines become visible** as callus forms and bone resorption occurs at the fracture site (10–14 days post-injury). 2. **Immobilization prevents displacement** of an occult fracture during the diagnostic period. 3. **Early immobilization improves union rates** and reduces risk of avascular necrosis (AVN) of the proximal pole. ## High-Yield Facts **Key Point:** Scaphoid fractures are **radiographically occult in 10–20% of cases** on initial presentation, especially if non-displaced. **Clinical Pearl:** The **anatomical snuffbox tenderness** (pain between extensor carpi radialis longus and brevis tendons) is the most sensitive clinical sign for scaphoid injury; **axial loading of the thumb** (longitudinal compression) is highly specific. **High-Yield:** Repeat radiographs at **10–14 days** show the fracture in ~90% of initially occult cases due to: - Bone resorption at fracture margins - Callus formation - Widening of fracture line ## Why Immobilization First? | Intervention | Timing | Rationale | |---|---|---| | **Thumb spica cast** | Immediately | Prevents displacement, reduces pain, allows early callus formation | | **Repeat radiographs** | 10–14 days | Fracture becomes radiographically visible | | **MRI/CT** | If repeat X-rays negative but symptoms persist | Definitive imaging if fracture still not visible | **Warning:** Do NOT discharge without immobilization — an occult fracture left untreated risks **nonunion, delayed union, and AVN of the proximal pole** (especially if proximal third fracture). ## Citation [cite:Rockwood & Green's Fractures in Adults Ch 7 — Scaphoid Fractures]