Smith's Fracture
Upper LimbOverview
Smith's fracture is a transverse fracture of the distal radius with volar (palmar) displacement of the distal fragment, often resulting from a fall onto a flexed wrist or direct blow to the dorsal forearm. It represents approximately 10-15% of all distal radius fractures and typically occurs in elderly patients with osteoporosis or younger patients following high-energy trauma. The condition requires prompt medical assessment and imaging, as proper alignment is critical for functional wrist recovery.
Pathophysiology
Smith's fracture occurs when a compressive force is applied to a flexed wrist, driving the distal radius fragment in a volar direction. This mechanism is opposite to Colles' fracture (dorsal displacement). The fracture may be simple (two-part) or complex (comminuted), with potential involvement of the lunate fossa and radial styloid process. Volar displacement can compromise the anterior interosseous nerve and radial artery, and may lead to carpal tunnel syndrome post-injury. Untreated or malpositioned fractures result in loss of wrist extension, grip strength, and forearm supination.
Patient Education
Proper immobilization, adherence to rehabilitation protocols, and gradual progressive loading are essential to restore wrist function and prevent chronic stiffness or arthritis.
Typical Presentation
Site
Distal radius, typically 2-3 cm proximal to wrist crease; pain may radiate into palm, thumb, and index finger
Quality
Acute sharp pain with associated numbness or tingling in radial nerve distribution; swelling and bruising typically pronounced on volar aspect
Intensity
Severe (8-10/10) at time of injury; moderate (5-7/10) during early healing phase
Aggravating
Wrist flexion, pronation/supination, gripping, weight-bearing through the wrist, direct pressure over fracture site
Relieving
Immobilization in cast or splint, elevation, ice application, anti-inflammatory medication, supported rest
Associated
Swelling and bruising (especially volar), visible deformity ('dinner fork' appearance in reverse), loss of wrist extension, reduced pronation/supination, potential anterior interosseous nerve compression signs
Orthopaedic Tests
Clinical Deformity Assessment (Dinner Fork Deformity)
Procedure
Observe the wrist in profile from the radial side. Note the characteristic volar (anterior) displacement and angulation of the distal fragment, creating a appearance similar to an upside-down fork.
Positive Finding
Visible volar prominence of the distal wrist with loss of the normal dorsal convexity; altered wrist contour
Sensitivity / Specificity
Unknown / Unknown
Interpretation
Highly suggestive of Smith's fracture. This clinical sign is pathognomonic and warrants immediate imaging confirmation. The deformity reflects volar displacement of the distal radial fragment.
Wrist Range of Motion Testing
Procedure
Gently attempt passive and active dorsiflexion and volar flexion of the wrist. Measure range using a goniometer if possible. Avoid forceful movement if fracture is suspected.
Positive Finding
Severe limitation of wrist extension (dorsiflexion) and flexion; pain at end-range; protective muscle guarding
Sensitivity / Specificity
Unknown / Unknown
Interpretation
Loss of motion confirms significant wrist injury. Severe restriction supports fracture rather than soft-tissue injury alone. Guides rehabilitation timeline and identifies stiffness complications.
Palpation for Point Tenderness and Crepitus
Procedure
Systematically palpate the ventral (volar) wrist surface, distal radius, and radial styloid process. Palpate gently to identify localised swelling and feel for bony crepitus or step-off deformity.
Positive Finding
Marked tenderness over the volar distal radius; palpable swelling; possible bony crepitus or step-off at fracture site
Sensitivity / Specificity
Unknown / Unknown
Interpretation
Confirms localised trauma to distal radius and guides fracture location. Crepitus suggests fracture fragments; step-off deformity indicates displacement. Informs radiographic imaging strategy.
Pronation/Supination Assessment
Procedure
With the elbow flexed at 90° and the shoulder at neutral, ask the patient to actively pronate and supinate the forearm through full range. Observe for loss of rotation and pain.
Positive Finding
Limitation of pronation and/or supination; pain during rotation, especially in pronation; guarding or reluctance to move
Sensitivity / Specificity
Unknown / Unknown
Interpretation
Loss of forearm rotation suggests involvement of the proximal or distal radioulnar joint, which may occur with Smith's fracture or associated injuries. Helps rule out isolated soft-tissue injury.
Swelling and Edema Assessment
Procedure
Measure wrist circumference bilaterally at the same anatomical level (e.g. 5 cm proximal to wrist crease). Compare side-to-side. Observe for rapid swelling progression.
Positive Finding
Circumferential swelling >1 cm difference between wrists; rapid onset; diffuse soft-tissue oedema over volar wrist and forearm
Sensitivity / Specificity
Unknown / Unknown
Interpretation
Rapid swelling is consistent with acute fracture and vascular compromise from displaced fragments. Guides urgency of imaging and reduction. Monitor for compartment syndrome risk.
Grip Strength Testing (when appropriate)
Procedure
Using a dynamometer, measure grip strength in the unaffected hand first, then attempt measurement in the injured hand if pain allows. Compare bilaterally.
Positive Finding
Severely reduced grip strength (<5 kg) in the injured hand; pain limiting voluntary contraction; refusal to attempt due to pain
Sensitivity / Specificity
Unknown / Unknown
Interpretation
Marked loss of grip strength confirms significant wrist/forearm dysfunction. Severe weakness supports fracture diagnosis over simple sprain. Baseline for monitoring recovery progress.
⚠ Red Flags
- •Acute severe trauma with neurovascular compromise (pale, pulseless, cold hand)
- •Signs of compartment syndrome (severe pain out of proportion, pain on passive stretch, paresthesia, pallor, paralysis)
- •Open fracture with wound contamination or exposed bone
- •Signs of anterior interosseous nerve injury (loss of thumb IP flexion and index finger DIP flexion)
- •Radial or ulnar artery compromise
- •Ipsilateral injuries requiring urgent management (polytrauma, head injury)
⚡ Yellow Flags
- •Fear-avoidance beliefs regarding wrist movement and re-injury
- •Low mood or anxiety related to functional loss and recovery uncertainty
- •Unrealistic expectations about healing timeline (typically 6-12 weeks for bone union)
- •Reluctance to engage in rehabilitation due to pain catastrophizing
- •Occupational or sports demands that may create psychological pressure for rapid return
Osteopathic Techniques
Region
Distal radius and wrist joint (post-immobilization period, fracture union confirmed)
Technique
Soft Tissue
Rationale
Gentle soft tissue mobilization to surrounding musculature (flexor carpi radialis, palmaris longus, pronator teres) reduces muscular guarding, improves local circulation, and facilitates proprioceptive input without stressing the healing fracture
Region
Wrist and forearm (mid-to-late healing phase)
Technique
Articulation
Rationale
Gentle passive range of motion articulation supports synovial fluid distribution, maintains cartilage nutrition, and progressively restores wrist extension and radial/ulnar deviation without applying excessive stress to the fracture site
Region
Forearm flexor compartment and carpal tunnel region
Technique
Soft Tissue
Rationale
Myofascial release and scar tissue mobilization prevent anterior interosseous nerve and median nerve entrapment, reduces inflammation-related nerve compression, and improves volar forearm extensibility
Region
Cervical spine and shoulder girdle
Technique
MET
Rationale
Muscular energy techniques to cervical extensors, upper trapezius, and shoulder stabilizers address referred pain patterns and postural compensation from prolonged immobilization, restoring normal cervicothoracic mechanics
Region
Distal radius fracture site and surrounding tissues (late rehabilitation)
Technique
Functional
Rationale
Functional technique supports progressive weight-bearing tolerance by allowing the wrist to find its most stable position during gentle loading activities, facilitating neuromuscular re-education and proprioceptive recovery
Region
Lymphatic drainage pathways of forearm and wrist
Technique
Lymphatic
Rationale
Gentle lymphatic drainage techniques reduce post-immobilization edema, improve microcirculation to support bone healing, and enhance removal of metabolic waste products from the healing fracture site
Add-On Approaches
Chinese Medicine
Acupuncture to local points (TE5 Waiguan, LI5 Yangxi) and distal points (ST36 Zusanli) combined with moxibustion supports Qi and blood circulation to accelerate bone healing; herbal formulas containing bone-knitting herbs (e.g., Tienchi, Eucommia) enhance callus formation
Chiropractic
Extremity adjustments to wrist and radiocarpal joint (once fracture union confirmed) restore joint mechanics; cervical and thoracic manipulation addresses postural compensation patterns
Physiotherapy
Progressive resistance training focusing on forearm pronation/supination, wrist extension, and grip strengthening; proprioceptive training and functional retraining for activities of daily living; kinetic chain assessment to improve load distribution
Remedial Massage
Deep tissue massage to forearm extensors and flexors reduces muscular tension from immobilization; trigger point release of brachioradialis and extensor carpi radialis supports pain-free wrist extension
Rehabilitation Exercises
Wrist Pendulum Exercises
Passive Wrist Flexion and Extension (Supported)
Forearm Pronation and Supination (Gravity-Eliminated)
Wrist Extensor Stretch (Opposite Arm Assisted)
Wrist Flexor Stretch (Palm-Up)
Grip Strengthening with Soft Ball or Therapy Putty
Wrist Extension Resistance Band Exercise
Pronation and Supination with Light Dumbbell
Proprioceptive Weight Shifting (Two-Handed Neutral Wrist)
Shoulder Blade Stabilization Exercises (Rows and Scapular Squeezes)
Progressive Functional Activities (Reaching, Lifting, Writing)
Wrist Radial and Ulnar Deviation with Resistance
Referral Criteria
- •Any suspected Smith's fracture requires immediate referral to Emergency Department for imaging (X-ray) and orthopedic assessment
- •Neurovascular compromise (absent pulse, severe paresthesia, coolness, pallor) requires urgent vascular surgery consultation
- •Signs of compartment syndrome warrant immediate surgical decompression
- •Open fracture requires orthopedic and infection control management
- •Failed conservative management or loss of reduction during healing phase requires orthopedic review for possible surgical intervention (open reduction and internal fixation)
- •Persistent nerve symptoms (carpal tunnel syndrome, anterior interosseous nerve palsy) post-immobilization warrant neurology or hand surgery referral
- •Chronic complex regional pain syndrome symptoms warrant pain management specialist and physiotherapy
- •Work-related injury or occupational demands requiring early return warrant ergonomic consultation and occupational medicine input