Distal Biceps Tendon Ruptures: Diagnostic Strategy Through Physical Examination

Area of Science:

• Orthopedic Surgery
• Diagnostic Imaging
• Musculoskeletal Disorders

Background:

• Distinguishing complete from partial distal biceps tendon ruptures is critical for appropriate management.
• Complete ruptures often necessitate prompt surgical repair, whereas partial tears may be managed non-surgically.
• Reliable physical examination is paramount for guiding diagnosis and treatment decisions in distal biceps tendon injuries.

Purpose of the Study:

• To identify the most accurate diagnostic test(s) for complete distal biceps tendon ruptures in the acute phase (≤1 month).
• To determine the optimal tests for diagnosing chronic (>1 month) distal biceps tendon ruptures.
• To guide the use of additional imaging for suspected partial ruptures or tendinitis.

Main Methods:

• A cohort of 86 patients with suspected distal biceps tendon injury underwent standardized physical examinations.
• Key tests included the Hook test, passive forearm pronation, biceps crease interval (BCI), and biceps crease ratio.
• Diagnosis was confirmed via intraoperative findings, MRI, or ultrasound.

Main Results:

• The combination of a positive Hook test and BCI demonstrated high accuracy for diagnosing acute complete ruptures (94% sensitivity, 100% specificity).
• This combination also showed 100% specificity for chronic ruptures.
• Weakness on active supination and palpation of the tendon footprint offered 100% sensitivity for chronic complete and partial ruptures, respectively.

Conclusions:

• The Hook test combined with BCI is highly effective for diagnosing acute complete distal biceps tendon ruptures.
• Specific physical exam findings can accurately identify chronic ruptures and partial tears, potentially reducing the need for imaging.
• Accurate physical examination can expedite treatment, improve outcomes, and lower healthcare costs.