OSCE Orthopedics: De Quervain’s Tenosynovitis

This guide is designed to achieve a perfect score by ensuring accuracy in each assessment step, with added emphasis on the diagnosis of De Quervain’s Tenosynovitis in its full form.

1. Patient Introduction and Communication (10 points)

1. Introduce Yourself: Politely introduce yourself, explaining your role.
2. Confirm Patient Identity: Verify the patient’s name for correct identification.
3. Explain the Examination Process: Clearly explain that you will assess the wrist, thumb, and hand to evaluate for De Quervain’s Tenosynovitis. Mention that specific movements and tests will be performed to assess any pain or weakness.

2. Physical Examination (85 points total)

Inspection (10 points)

• Swelling over the Radial Styloid: Look for swelling over the radial styloid, a common finding in De Quervain’s Tenosynovitis due to inflammation of the abductor pollicis longus (APL) and extensor pollicis brevis (EPB) tendons.
• Deformity, Redness, or Discoloration: Observe for any skin discoloration, redness, or deformity along the radial side of the wrist, which may indicate underlying inflammation or suggest alternative pathology.

Palpation (5 points)

• Tenderness over the Radial Styloid: Palpate the radial styloid area. Tenderness here is a hallmark sign of De Quervain’s Tenosynovitis.
• Warmth and Swelling: Assess for warmth, suggesting active inflammation in the region.

Movement Assessment (5 points)

• Range of Motion (ROM): Test wrist and thumb movements, including flexion, extension, ulnar, and radial deviation. Limited or painful ROM suggests tendon involvement.

Motor Function (20 points)

• Thumb Abduction and Extension:
  • APL and EPB Testing: Ask the patient to abduct and extend the thumb against resistance, focusing on the muscles associated with De Quervain’s Tenosynovitis.
• Grip Strength: Assess grip strength, as patients with De Quervain’s often report weakness or pain during gripping activities.

Sensation (5 points)

• Radial, Median, and Ulnar Nerve Distributions:
  • Test sensation over the radial side of the wrist (radial nerve), the thumb (median nerve distribution), and the ring and little fingers (ulnar nerve distribution) to rule out concurrent neuropathies.

Circulation (10 points)

• Pulse Check: Assess the radial pulse on the affected wrist to ensure normal circulation.
• Capillary Refill Time (CRT): Perform CRT on the thumb by pressing the nail bed and observing color return (<2 seconds is normal). Though not specific to De Quervain’s Tenosynovitis, it ensures a complete vascular assessment.

Reflex Testing (5 points)

• Biceps Reflex (C5-C6): Test this reflex as part of a general brachial plexus evaluation, especially if considering differential diagnoses.
• Triceps Reflex (C7): Check the triceps reflex, relevant if cervical radiculopathy is a differential consideration.

3. Special Tests for De Quervain’s Tenosynovitis (30 points)

Finkelstein’s Test (10 points)

• Procedure: Ask the patient to make a fist with the thumb tucked inside the fingers, then ulnarly deviate the wrist. A positive test results in pain along the radial styloid, indicative of De Quervain’s Tenosynovitis.

Eichhoff’s Test (10 points)

• Procedure: A variation of Finkelstein’s where the clinician actively ulnarly deviates the patient’s wrist while the thumb is in the fist. Pain in the radial styloid area suggests tendon involvement.

Resisted Thumb Extension (10 points)

• Procedure: Apply resistance to thumb extension. Pain over the radial styloid area with resisted extension is another indicator of De Quervain’s Tenosynovitis.

4. Differential Diagnosis Tests (20 points)

1. Trigger Finger: Palpate the A1 pulley area for tenderness or clicking when the patient flexes the finger, which indicates Trigger Finger.
2. Scaphoid Fracture: Palpate the anatomical snuffbox. Tenderness here suggests a scaphoid fracture rather than De Quervain’s Tenosynovitis.
3. Cubital Tunnel Syndrome: Perform Tinel’s sign at the elbow to assess for ulnar nerve irritation if symptoms extend to the ring and little fingers.

5. Diagnosis (15 points)

• Diagnosis of De Quervain’s Tenosynovitis: Based on examination findings, including a positive Finkelstein’s test, tenderness over the radial styloid, and pain during thumb movement. Ensure to document the full name, De Quervain’s Tenosynovitis, and specify the affected side for complete scoring.

Common Differential Diagnoses and Comparative Features

1. Trigger Finger:
   • Key Test: Painful locking or catching at the A1 pulley on flexion.
   • Differences: Involves the flexor tendons at the MCP joint rather than the radial wrist tendons.
2. Scaphoid Fracture:
   • Key Test: Snuffbox tenderness.
   • Differences: Pain with wrist movement, especially under load, not specific to thumb movement.
3. Cubital Tunnel Syndrome:
   • Key Test: Tinel’s sign at the elbow.
   • Differences: Ulnar nerve involvement, affecting ring and little fingers rather than the radial wrist.
4. Basal Thumb Arthritis:
   • Key Test: Grind test; pain with axial compression and rotation of the thumb metacarpal.
   • Differences: Chronic joint pain and crepitus at the thumb base.
5. Radial Tunnel Syndrome:
   • Key Test: Pain on resisted supination or elbow extension.
   • Differences: Pain proximal to the wrist, not directly involving thumb tendons.

This structured approach to the OSCE on De Quervain’s Tenosynovitis ensures a comprehensive and accurate assessment, meeting all scoring criteria. Each step focuses on complete evaluation, differential diagnosis, and correct documentation, with specific emphasis on using the full diagnostic name De Quervain’s Tenosynovitis to maximize points.