Trismus is commonly referred to as which condition?

• A. Jaw Dislocation
• B. Mandibular Spasm
• C. Brisk Jaw Clench
• D. Lockjaw

Answer: (D)

Trismus describes a limited ability to open the mouth due to tonic contraction of the jaw muscles. The common term for this condition is lockjaw, which conveys the sense that the jaw locks in a closed or nearly closed position because the muscles that close the jaw (primarily the masseter and temporalis) go into spasm. This restriction is what you’d expect to see with trismus and helps explain why opening the mouth becomes so difficult. Other options describe either a physical dislocation, a descriptive phrase for muscle activity, or a clenching action, but they don’t capture the typical clinical name for this state. Lockjaw is the familiar and widely used term.