A 24-year-old baseball pitcher complains of medial elbow pain and instability during throwing. Valgus stress testing reveals laxity. Which specific component of the ulnar collateral ligament is the primary restraint to valgus stress at the elbow?

• A Anterior oblique bundle ✓
• B Posterior oblique bundle
• C Transverse ligament
• D Radial collateral ligament

Explanation

The ulnar collateral ligament consists of three bundles, with the anterior oblique bundle acting as the primary restraint to valgus stress at the elbow, particularly during the throwing motion. The posterior oblique bundle serves as a secondary stabilizer that becomes taut at higher flexion angles. The transverse ligament spans between the olecranon and medial epicondyle but provides no medial joint stability. The radial collateral ligament is located laterally and resists varus stress, not valgus stress.

Reference: Clinically Oriented Anatomy, 8th ed.

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Written and medically reviewed by the StethoPrep medical team.