Correct Answer: C. Popeye sign
The Popeye sign is a clinical deformity of the arm caused by rupture of the distal biceps tendon, typically at its insertion on the radial tuberosity. When the tendon ruptures—usually from a sudden eccentric load or chronic degenerative changes—the proximal muscle belly retracts proximally, creating a characteristic bulge in the upper arm that resembles the cartoon character Popeye's exaggerated biceps. This sign is pathognomonic for distal biceps tendon rupture and is easily elicited on physical examination by asking the patient to flex the elbow against resistance. The patient presents with loss of supination strength (more than flexion loss, since the brachialis remains intact for flexion) and a palpable gap at the antecubital fossa. In Indian clinical practice, this injury is commonly seen in middle-aged men performing heavy lifting or in athletes. The diagnosis is confirmed by ultrasound or MRI, and surgical reattachment is the gold standard treatment to restore supination strength, particularly in younger or active patients. The sign is named after the cartoon character due to the exaggerated appearance of the biceps muscle.
Why the other options are wrong
A. Rising sun sign — This is wrong because the rising sun sign is a radiological finding seen in anterior shoulder dislocation, where the humeral head appears to rise above the glenoid rim on AP X-ray, resembling a rising sun. It is not a clinical deformity of the arm and has no relation to biceps tendon pathology. This is a common trap for students who confuse radiological signs with clinical signs. B. Hill-Sachs sign — This is wrong because the Hill-Sachs sign is a radiological finding—a compression fracture of the posterolateral aspect of the humeral head caused by repeated anterior shoulder dislocations. It is seen on internal rotation X-rays and has no clinical deformity in the arm. Students often confuse shoulder-related signs, but Hill-Sachs is purely radiological and unrelated to biceps tendon rupture. D. Griesinger sign — This is wrong because Griesinger sign is a clinical finding in trichinellosis (parasitic infection), characterized by edema of the eyelids and conjunctiva. It is completely unrelated to upper limb anatomy or biceps pathology. This option tests whether students confuse eponymous signs across different organ systems—a classic NBE trap.
High-Yield Facts
- Popeye sign = proximal retraction of biceps muscle belly after distal tendon rupture, creating visible bulge in upper arm.
- Distal biceps rupture most commonly occurs at the radial tuberosity insertion, usually from eccentric load in middle-aged men.
- Supination strength loss is more pronounced than flexion loss because brachialis muscle preserves elbow flexion.
- Palpable gap at the antecubital fossa is the clinical hallmark; diagnosis confirmed by ultrasound or MRI.
- Surgical reattachment is gold standard in active patients to restore supination; conservative management acceptable only in sedentary elderly.
Mnemonics
POPEYE = Proximal Protrusion Proximal muscle belly Protrudes upward after Proximal retraction of ruptured distal tendon. Remember: the bulge is in the upper arm (proximal), not at the wrist. Biceps Rupture Sites Proximal (long head at labrum) = less common, causes Popeye sign less obvious. Distal (radial tuberosity) = classic Popeye sign. Distal ruptures are more clinically obvious because the entire muscle belly retracts.
NBE Trap
NBE pairs shoulder-related radiological signs (rising sun, Hill-Sachs) with a clinical arm deformity sign to test whether students confuse imaging findings with bedside clinical signs. The trap is that students may recognize "shoulder dislocation" and pick a shoulder sign without carefully reading that the question asks for a clinical deformity.
Clinical Pearl
In Indian orthopedic practice, distal biceps rupture is often missed initially because patients present with arm pain and weakness, not obvious deformity. Teaching patients to recognize the Popeye sign—by comparing their affected arm to the unaffected side during flexion—helps with early diagnosis and timely surgical referral, which is critical for functional recovery in laborers and farmers.
_Reference: Bailey & Love Ch. 58 (Upper Limb); Robbins Ch. 27 (Musculoskeletal System)_