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Colles' Fracture - Detailed Analysis & Question Bank

Definition

• Dorsal (backward) displacement and angulation of the distal fragment
• Radial displacement of the carpus
• Proximal displacement (radial shortening)
• Frequently associated fracture of the ulnar styloid

• Rosen's Emergency Medicine, p. 612
• Pye's Surgical Handicraft, p. 189

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Epidemiology & Mechanism

• Most common wrist fracture in adults
• Classically affects postmenopausal women (underlying osteoporosis makes it a pathological fracture in this group)
• Mechanism: Fall on an outstretched, extended (dorsiflexed) hand (FOOSH)
• Compression forces on the dorsal side produce dorsal comminution; fracture may extend into the radiocarpal or radioulnar joints ("die-punch" fracture)

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Anatomy of Displacement (The "DRAB" Pattern)

• ~10-15° volar tilt on lateral view
• ~22-23° radial inclination on AP view
• Radius normally longer than ulna (negative ulnar variance)

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Clinical Features

Symptoms

• Pain, swelling, and tenderness at the distal wrist
• Palmar paresthesias (median nerve compression)
• Restricted wrist motion

Signs

• "Dinner fork" deformity - the classic appearance on lateral view: wrist looks like a dinner fork because the hand is displaced dorsally relative to the forearm
• "Garden spade" deformity - appearance on AP view with radial displacement
• Radial deviation of the hand
• Prominent ulnar head (due to radial shortening)
• Tenderness over the distal radius

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Radiographic Appearance

• Dorsal angulation >20 degrees
• Intraarticular involvement
• Marked comminution
• Radial shortening >1 cm (or >5 mm)
• Distal radioulnar joint instability

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Classification Systems

1. Gartland and Werley (1951)

2. Frykman Classification (1967) - 8 types

Higher even numbers = worse prognosis. Ulnar styloid fracture in any group increases number by 1.

3. Melone Classification (1986)

4. Fernandez Classification (1987)

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Management

Step 1: Assessment for Reduction

• Lateral X-ray shows dorsal tilt beyond neutral
• Radial shortening (radius not longer than ulna on AP view)
• Dorsal angulation >20 degrees
• Significant displacement

• Undisplaced, nondisplaced fractures
• Acceptable alignment (volar tilt neutral or slightly positive)

Step 2: Anesthesia for Reduction

1. Hematoma block (most common, easy method):
   • 22-gauge needle inserted dorsally into fracture site
   • Aspirate to confirm hematoma
   • Inject 5-10 mL of 1-2% lidocaine (with or without bupivacaine)
   • Skin surface can be iced or sprayed with ethyl chloride first
2. IV regional anesthesia (Bier block)
3. Regional nerve blocks (median, radial, ulnar, or brachial plexus)
4. Procedural sedation (for very comminuted or difficult fractures)

Step 3: Closed Reduction Technique

1. Traction applied to distal fragment to disimpact from proximal fragment
   • Use finger traps + countertraction on arm, OR
   • Manual traction with assistant holding upper arm
2. Re-creation of deformity (increases angulation briefly) to unlock dorsal cortex
3. Correction: push distal fragment distally, volarly (anteriorly), and ulnarly using thenar eminence
4. Goal: Restore volar tilt (minimum neutral/0°, ideally 10-15° volar), radial inclination, and radius length

Finger traps relax deforming muscle forces, may perform reduction alone, and hold reduction during splinting.

Step 4: Immobilization

• Double sugar-tong splint (one from elbow to wrist, second over it from elbow to axilla) - Pfenninger's / Rosen's
• Immobilization for 4-6 weeks
• Allows finger movement
• Circumferential casting avoided for at least 24 hours (risk of neurovascular compromise from edema)
• If short-arm cast applied, bivalve to allow for swelling

Step 5: Follow-up

• Radiographs at 1, 2, and 6 weeks
• Urgent orthopaedic referral within 2-3 days in most cases
• After cast removal at 6 weeks: if tenderness persists or incomplete union, apply ulnar gutter splint

Indications for Surgery (Operative Management)

• Open fracture
• Neurovascular compromise
• Unstable, severely comminuted, or intra-articular fractures
• Dominant wrist in high-demand (very active) patient
• Failed closed reduction
• Irreducible fractures

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Associated Injuries

• Ulnar styloid fracture - occurs in ~60% of Colles' fractures; avulsed by the interarticular disc; disrupts the lower radioulnar joint
• Triangular fibrocartilage complex (TFCC) injury - caused by ulnar styloid avulsion
• Scaphoid fracture (less common, but check)
• Distal radioulnar joint (DRUJ) disruption
• Carpal instability

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Complications

Early Complications

Late Complications

• Dorsal angulation ≥20 degrees
• Radial shortening ≥5 mm
• Intraarticular extension
• Significant comminution
• Older age

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Colles' vs. Smith's vs. Barton's Fractures

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Question Bank (Exam-Style Q&A)

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• Dorsal angulation >20 degrees
• Intraarticular extension (radiocarpal or radioulnar joint)
• Marked comminution
• Radial shortening >1 cm (or >5 mm)
• DRUJ instability

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• Intraarticular involvement (radiocarpal, radioulnar, or both)
• Associated ulnar styloid fracture (adds 1 to the type number) Types 1-2 = extra-articular, Types 3-8 = intra-articular. Higher even numbers = worse prognosis.

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1. Volar tilt (minimum 0°/neutral, ideally 10-15° volar)
2. Radial inclination (~22°)
3. Radius length (negative ulnar variance or radius equal to ulna)

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• Open fracture
• Neurovascular compromise
• Unstable/comminuted/intra-articular fractures not reducible by closed methods
• High-demand patient (dominant wrist)
• Failed closed reduction

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• Rosen's Emergency Medicine: Concepts and Clinical Practice, pp. 612-613
• Tintinalli's Emergency Medicine: A Comprehensive Study Guide, pp. 1847-1848
• Pfenninger and Fowler's Procedures for Primary Care, 3rd Ed., pp. 1321-1322
• Pye's Surgical Handicraft, 22nd Ed., pp. 189-190
• Campbell's Operative Orthopaedics, 15th Ed. (2026), Classification section

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Colles' Fracture — Complete Analysis & Question Bank

Definition

• Dorsal (backward) displacement and angulation of the distal fragment
• Radial displacement of the carpus
• Proximal displacement (radial shortening)
• Frequently associated ulnar styloid fracture

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Epidemiology & Mechanism

• Most common wrist fracture in adults
• Classically affects postmenopausal women (osteoporotic bone = pathological fracture in this group)
• Mechanism: Fall on an outstretched, extended (dorsiflexed) hand - FOOSH
• Compression forces on the dorsal side produce dorsal comminution
• Fracture may extend into radiocarpal or radioulnar joints ("die-punch" fracture)

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The Four Classic Displacement Features (DRAB)

• Volar tilt: ~10-15° on lateral view
• Radial inclination: ~22-23° on AP view
• Radius normally longer than ulna (negative ulnar variance)

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Clinical Features

Deformities

• "Dinner fork" deformity - lateral view: hand displaced dorsally relative to forearm, resembling an upturned dinner fork
• "Garden spade" deformity - AP view: radial deviation of hand
• Prominent ulnar head (from radial shortening)
• Swelling, ecchymosis, point tenderness over distal radius

Neurological

• Palmar paresthesias from median nerve compression (most common nerve affected, ~17%)
• Always assess neurovascular status before and after reduction

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Radiographic Findings

Criteria for UNSTABLE Fracture

• Dorsal angulation >20 degrees
• Intraarticular extension (radiocarpal or radioulnar)
• Marked comminution
• Radial shortening >5 mm to 1 cm
• DRUJ instability

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Classification Systems

1. Gartland and Werley (1951)

2. Frykman Classification (1967) - Most used

• Intraarticular involvement (radiocarpal / radioulnar / both)
• Presence or absence of ulnar styloid fracture (adds 1 to type number)

Higher even numbers = worst prognosis. Type 8 = most severe.

3. Melone Classification (1986)

4. Fernandez Classification (1987)

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Management

Step 1 - Assess Need for Reduction

• Dorsal tilt beyond neutral on lateral X-ray
• Radius shorter than ulna on AP (positive ulnar variance)
• Dorsal angulation >20°
• Significant displacement

• Undisplaced or nondisplaced
• Volar tilt neutral or slightly positive
• No significant shortening

Step 2 - Anesthesia

The hematoma block avoids procedural sedation and reduces ED length of stay.

Step 3 - Reduction Technique

1. Apply traction to distal fragment (via finger traps + countertraction, or manual)
2. Disimpact the fragment from proximal radius
3. Re-create deformity briefly to unlock dorsal cortex (if periosteal entrapment present)
4. Push distal fragment: distally + volarly (anteriorly) + ulnarly
5. Use thenar eminence of operator to mold fragment into position

Finger traps relax deforming muscle spasm, may complete reduction alone, and hold alignment during splinting.

• Restore volar tilt (minimum 0°/neutral, ideally 10-15° volar)
• Restore radial inclination (~22°)
• Restore radial length (negative ulnar variance)

Step 4 - Immobilization

• Double sugar-tong splint: first from elbow to wrist; second over it from elbow to axilla
• Allows finger movement
• Immobilization for 4-6 weeks
• No circumferential casting for at least 24 hours (edema risk)
• If short-arm cast applied, bivalve it

Step 5 - Follow-up

• X-rays at 1, 2, and 6 weeks
• Urgent orthopaedic referral within 2-3 days
• At 6 weeks: assess union; if incomplete, continue splinting

Indications for Surgery

• Open fracture
• Neurovascular compromise
• Unstable / severely comminuted / intraarticular fractures
• Failed or irreducible closed reduction
• Dominant wrist of high-demand/active patient
• Fractures with >5 mm articular step-off

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Associated Injuries

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Complications

Immediate

Late

• Dorsal angulation ≥20°
• Radial shortening ≥5 mm
• Intraarticular involvement
• Severe comminution
• Older age with osteoporosis

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Colles' vs Smith's vs Barton's - Comparison Table

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Exam-Style Question & Answer Bank

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• Dinner fork deformity (lateral view) - dorsal displacement of hand relative to forearm
• Garden spade deformity (AP view) - radial deviation of the hand

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• Intraarticular involvement: none (1-2), radiocarpal (3-4), radioulnar (5-6), both (7-8)
• Even numbers = associated ulnar styloid fracture
• Higher number = worse prognosis; Group 8 is the most severe

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1. Apply traction (finger traps or manual) to disimpact fragment
2. Re-create deformity if periosteal entrapment suspected
3. Push distal fragment distally + volarly + ulnarly
4. Mold and hold while applying splint
5. Goal: restore volar tilt (≥0°), radial inclination, and radial length

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• Rosen's Emergency Medicine: Concepts and Clinical Practice
• Tintinalli's Emergency Medicine: A Comprehensive Study Guide
• Pfenninger and Fowler's Procedures for Primary Care, 3rd Ed.
• Pye's Surgical Handicraft, 22nd Ed.
• Campbell's Operative Orthopaedics, 15th Ed. (2026)