A 32-year-old male construction worker sustains a crush injury to his left forearm after a steel beam falls on it. Plain radiographs show a comminuted fracture of the radius and ulna with soft tissue swelling. The attending surgeon suspects an intra-articular extension at the wrist joint. Which investigation is most appropriate to confirm the intra-articular involvement and guide surgical planning?

Question

Accepted Answer

A. High-resolution CT scan with 3D reconstruction. ## Investigation of Choice for Intra-articular Fracture Assessment

### Why CT with 3D Reconstruction is Optimal

**Key Point:** High-resolution CT with 3D reconstruction is the gold standard for evaluating comminuted fractures with suspected intra-articular extension, particularly in the wrist and forearm.

**Clinical Pearl:** CT provides:
- Precise delineation of fracture fragments and their spatial relationships
- Clear visualization of intra-articular involvement
- Accurate assessment of articular surface displacement
- 3D reconstruction aids preoperative surgical planning and implant selection

### Why CT Excels in This Scenario

| Feature | CT with 3D | MRI | Ultrasound | Repeat X-rays |
|---------|-----------|-----|-----------|---------------|
| **Bone detail** | Excellent | Poor | Poor | Limited |
| **Fragment count** | Precise | Moderate | Poor | Inadequate |
| **Intra-articular extension** | Excellent | Moderate | Poor | Inadequate |
| **Surgical planning** | Optimal | Moderate | Poor | Suboptimal |
| **Speed** | Fast | Slow | Fast | Fast |
| **Cost-effectiveness** | Moderate | High | Low | Low |

**High-Yield:** In comminuted fractures with suspected intra-articular involvement, CT is superior because:
1. It shows the exact number and position of bone fragments
2. It reveals subtle articular surface steps (even <2 mm)
3. It guides fixation strategy (ORIF vs. external fixation)
4. 3D reconstruction allows virtual surgical planning

**Mnemonic: CT-PLAN** — **C**lear **T**hree-dimensional **P**icture for **L**arge **A**rticular **N**avigation

![Fracture Classification — Types and Patterns diagram](https://mmcphlazjonnzmdysowq.supabase.co/storage/v1/object/public/blog-images/explanation/3339.webp)

Answer

B. Repeat plain radiographs in different projections

Answer

C. Ultrasound of the wrist

Answer

D. MRI of the wrist

Explanation

Investigation of Choice for Intra-articular Fracture Assessment

Why CT with 3D Reconstruction is Optimal

Why CT Excels in This Scenario

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Feature	CT with 3D	MRI	Ultrasound	Repeat X-rays
Bone detail	Excellent	Poor	Poor	Limited
Fragment count	Precise	Moderate	Poor	Inadequate
Intra-articular extension	Excellent	Moderate	Poor	Inadequate
Surgical planning	Optimal	Moderate	Poor	Suboptimal
Speed	Fast	Slow	Fast	Fast
Cost-effectiveness	Moderate	High	Low	Low