Smith Fracture Rehabilitation: Managing Volar Displacement and Wrist Recovery
In short
Unlike Colles fractures, a Smith fracture involves volar displacement of the distal radial fragment, posing acute risks to the median nerve and flexor tendons. Explore specialised post-operative and conservative rehabilitation milestones.
In this guide (6 sections)
A Smith fracture, historically described as a reverse Colles fracture, is an unstable injury of the distal radius characterized by volar (palmar) displacement and volar angulation of the distal bone fragment. Typically caused by a direct blow to the dorsum of a flexed wrist or a fall backward onto a supinated, outstretched hand, this injury exhibits high inherent instability. The volar displacement directly encroaches upon the carpal tunnel, placing acute mechanical pressure on the median nerve and flexor tendons. Consequently, the vast majority of adult Smith fractures necessitate open reduction and internal fixation (ORIF) with a volar locking buttress plate. Physiotherapy must respect the healing volar structures, carefully timing wrist extension and composite fist training to avoid tenosynovitis or plate irritation.
Domestic and Cultural Indian Realities
In Indian homes, routine activities frequently place severe extension and weight-bearing forces through the palmar aspect of the wrist. Pushing up from low seating, such as a traditional wooden charpoy or a living room diwan, concentrates body weight directly over the volar plate fixation site; patients must learn to stand using thigh pushes or push from high armrests. Culinary chores like grinding spices with a stone mortar and pestle (sil-batta) or rolling dough with a heavy pin generate high shearing forces that stress the volar cortex and must be suspended for 8 weeks. Personal cleansing routines using a handheld water sprayer or mug require active pronation and palmar grip; patients should use lightweight plastic vessels and avoid carrying full buckets of water (balti) until bone consolidation is confirmed.
Clinical Biomechanics and Anatomical Healing
The distal radius carries 80% of axial compressive loads through the wrist, with the ulna bearing the remaining 20%. Volar displacement shifts the contact area anteriorly, disrupting the radiocarpal and distal radioulnar joints. Surgical placement of a low-profile volar locking compression plate provides absolute rigid stability, neutralising deforming forces from the pronator quadratus and brachioradialis muscles. However, the plate sits immediately dorsal to the flexor pollicis longus (FPL) and flexor digitorum profundus (FDP) tendons. If aggressive resisted finger flexion is introduced before soft tissue inflammation subsides, the flexor tendons can rub against the plate edge, creating flexor tenosynovitis or delayed tendon attrition.
Validated Special Tests and Differential Diagnosis
Clinical examination monitors for acute carpal tunnel syndrome using two-point discrimination testing on the index fingertip (normal is under 6mm) and Durkans carpal compression test. The integrity of the flexor pollicis longus tendon is verified by isolating active flexion of the thumb interphalangeal joint. Radiographic correlation confirms the restoration of the normal palmar tilt (averaging 11 degrees) and radial inclination (approximately 22 degrees), ruling out persistent volar subluxation or intra-articular screw penetration.
Stage-by-Stage Functional Recovery Protocol
Phase 1 (Weeks 0 to 2 post-op) emphasizes splint wear, finger oedema management, and active tendon gliding for all digits to prevent peritendinous adhesions. Phase 2 (Weeks 2 to 6) begins gentle active-assisted wrist extension, flexion, and gentle forearm supination once sutures are removed, keeping active wrist flexion limited to comfort to avoid compressive tension over the volar plate. Phase 3 (Weeks 6 to 12) progresses to isometric wrist strengthening, light functional grasping, and dynamic dart-thrower motion patterns, advancing to unrestricted domestic tasks after week 12.
Active-Assisted Dart-Thrower Wrist Motion
Objective: Restore functional wrist mobility while minimizing stress on healing volar structures
- 1Sit comfortably with your forearm supported on a table and hand extending over the edge in a neutral thumbs-up position.
- 2Slowly move your wrist upward and slightly outward into extension and radial deviation, mimicking the cocking phase of throwing a dart.
- 3Pause for 2 seconds at the top of the movement.
- 4Gently guide the wrist downward and slightly inward into flexion and ulnar deviation.
- 5Perform the movement smoothly without jerky movements or sharp pain.
| Clinical Feature | Colles Fracture (Dorsal Displacement) | Smith Fracture (Volar Displacement) |
|---|---|---|
| Mechanism of Injury | Fall onto outstretched hand with wrist in extension | Direct blow to dorsum of flexed wrist or fall backward |
| Deformity Appearance | Dinner-fork deformity with dorsal prominence | Garden-spade deformity with volar prominence |
| Vulnerable Soft Tissues | Extensor pollicis longus (EPL) tendon, dorsal capsule | Median nerve, flexor pollicis longus (FPL) tendon |
| Early Movement Restriction | Avoid forced wrist flexion during early consolidation | Avoid aggressive wrist extension and forceful gripping |
Red Flags and Urgent Surgical Indicators
Urgent surgical evaluation is required if the patient reports acute loss of active thumb IP joint flexion, which suggests flexor pollicis longus tendon rupture from friction against hardware. Sudden worsening of numbness or severe nighttime burning pain in the median nerve distribution indicates progressive carpal tunnel syndrome. Any surgical wound erythema, localized fluctuating swelling, or systemic fever signals potential deep hardware infection.
Frequently Asked Questions
Will the metal plate placed on the inside of my wrist need to be removed later?
In most patients, titanium volar locking plates remain in place permanently without causing issues. However, if the plate causes mechanical friction against the flexor tendons or creates persistent prominence in a thin wrist, elective removal may be planned after complete bone remodeling, typically 12 to 18 months post-surgery.
Can I knead dough or cook meals with a recovering Smith fracture?
Light food preparation using lightweight utensils is permissible by 6 weeks post-surgery. However, vigorous dough kneading, wringing heavy laundry, and lifting heavy cooking pots should be delayed until 10 to 12 weeks, once clinical testing confirms adequate bone union and painless grip strength.
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