Triquetrum Dorsal Avulsion Fracture Rehabilitation: Wrist Hyperextension Protocols
In short
The triquetrum is the second most commonly fractured carpal bone. Discover diagnostic radiographic signs, conservative immobilization guidelines, and structured rehabilitation protocols.
In this guide (6 sections)
Fractures of the triquetrum represent the second most common carpal bone injury after the scaphoid, accounting for approximately 15% to 20% of all carpal trauma. The vast majority present as dorsal cortical avulsion fractures, classically caused by a fall onto an outstretched hand (FOOSH) with the wrist forced into violent hyperextension and ulnar deviation. This mechanism leads to impaction of the ulnar styloid process into the dorsal triquetral cortex or tensile avulsion by the strong dorsal radiocarpal and dorsal intercarpal ligaments. On lateral wrist radiographs, the displaced avulsion flake appears as a characteristic small bone fragment resting dorsal to the carpal row, colloquially recognized as the pooping duck sign. Unlike complex scaphoid fractures, dorsal triquetral avulsions have a rich cancellous blood supply and heal reliably with conservative management in a short-arm splint or cast for 3 to 4 weeks. Physiotherapy systematically restores wrist flexion-extension, eliminates ulnar-sided tenderness, and rebuilds functional hand grip.
Domestic and Cultural Indian Realities
In an Indian domestic setting, manual chores frequently place repetitive extension and ulnar deviation loads across the wrist. Kneading firm wheat dough (atta) for rotis, grinding spices with a heavy pestle, or wringing out wet sarees imposes sharp torsional and compressive forces directly across the dorsal triquetral cortex; these tasks should be modified or delegated during the first 6 weeks. Pushing oneself up from low seating, such as a traditional wooden charpoy, low diwan, or bathroom floor stool (patla), places body weight onto the extended wrist, causing localized pain; patients should push using a closed fist or rise using uninjured arm support. Carrying heavy stainless steel milk vessels (patilas) or iron cooking pans (kadai) recruits strong ulnar deviation; patients should use adapted two-handed techniques. Commuting on two-wheelers involves gripping handlebars and pulling the clutch lever, which should be avoided until comfortable grip strength is restored.
Clinical Biomechanics and Anatomical Healing
The triquetrum is a pyramidal carpal bone located on the ulnar side of the proximal carpal row, articulating with the lunate, hamate, and pisiform. It plays an essential role in carpal kinematics: during wrist radial deviation, the triquetrum flexes and glides proximally, whereas during ulnar deviation, it extends and locks against the hamate. Dorsal avulsion fractures occur when the dorsal radiocarpal ligament pulls a cortical flake from the bone surface. Because the avulsion involves cortical bone with intact surrounding periosteal margins, fibrous and bony consolidation progresses rapidly. Prolonged immobilisation beyond 4 weeks causes unnecessary radiocarpal stiffness; early transition to active-assisted dart-thrower motion maintains midcarpal kinematics without stressing dorsal ligamentous attachments.
Validated Special Tests and Differential Diagnosis
Clinical evaluation identifies pinpoint focal tenderness directly over the dorsal aspect of the triquetrum, located just distal to the ulnar styloid process and dorsal to the pisiform. Pain is reproduced by passively flexing the wrist while applying gentle ulnar deviation. Lateral wrist radiographs reveal the classic dorsal avulsion fragment. Differential diagnosis distinguishes a dorsal avulsion fracture from a true triquetral body fracture (which is associated with high-energy perilunate dislocations), triangular fibrocartilage complex (TFCC) tears, and ulnar styloid non-unions using dedicated CT scans or MRI.
Stage-by-Stage Functional Recovery Protocol
Phase 1 (Weeks 0 to 3 post-injury) protects the wrist in a short-arm splint or removable wrist brace with the wrist in slight extension. Full active finger, thumb, and elbow exercises are performed continuously to maintain tendon excursion. Phase 2 (Weeks 3 to 6) removes the splint for supervised active-assisted wrist flexion and extension, active dart-thrower motion drills, and gentle forearm pronation and supination. Phase 3 (Weeks 6 to 10) progresses to progressive resistance training with light dumbbells, therapeutic putty grip strengthening, and gradual return to domestic cooking and driving.
Active Dart-Thrower Wrist Motion Drill
Objective: Restore functional wrist mobility within a plane that minimizes dorsal triquetral ligamentous strain
- 1Sit beside a table with your forearm supported on a pillow and your hand extending over the edge in a thumbs-up neutral position.
- 2Slowly move your wrist upward and slightly outward into extension and radial deviation, as if cocking a dart.
- 3Hold for 2 seconds at the top of the comfortable range.
- 4Slowly guide the wrist downward and slightly inward into flexion and ulnar deviation, as if throwing a dart.
- 5Repeat the movement with smooth, controlled rhythm, breathing normally and keeping fingers relaxed.
| Clinical Feature | Dorsal Avulsion Flake (Common) | Triquetral Body Fracture (Rare) |
|---|---|---|
| Mechanism of Injury | Low to moderate fall with hyperextension / ulnar deviation | High-energy direct crush or axial load with perilunate dislocation |
| Standard Medical Strategy | Conservative short-arm splint for 3 to 4 weeks | Often requires ORIF with headless screws or K-wires |
| Carpal Instability Risk | Extremely low; carpal row ligaments remain intact | High risk of associated perilunate or carpal instability |
| Time to Full Functional Recovery | Typically 6 to 8 weeks | Typically 12 to 16 weeks post-surgical stabilization |
Red Flags and Urgent Surgical Indicators
Seek immediate hand surgical assessment if post-injury radiographs show carpal malalignment: such as overlapping carpal bones or abnormal scapholunate widening (Terry Thomas sign): indicating a high-energy perilunate dislocation complex rather than an isolated avulsion. Tingling, numbness, or loss of sensation in the little finger indicates secondary ulnar nerve contusion. Persistent severe pain accompanied by swelling that fails to improve after 4 weeks warrants an MRI to evaluate associated triangular fibrocartilage complex (TFCC) tears.
Frequently Asked Questions
What is the 'pooping duck' sign on a wrist X-ray?
On a side-view (lateral) wrist X-ray, the outline of the carpal bones normally resembles the profile of a sitting duck. When a dorsal triquetral fracture occurs, the small avulsed bone chip rests just behind the duck tail, creating a classic radiographic appearance humorously termed the pooping duck sign.
Does the small broken bone chip on the back of my wrist need to be surgically removed?
In over 95% of cases, surgical removal is completely unnecessary. The small avulsion flake heals reliably with stable fibrous scar tissue or bony union inside a splint, allowing full, pain-free wrist movement within 6 to 8 weeks without long-term consequences.
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