ACL Tear — NPTE Cheat Sheet* What it is: * ACL failure from excessive anterior tibial translation — basically the tibia tries to run off and the ACL can’t hold the line. * Classic signs: * Pop * Immediate swelling (1–2 hours) * Pivot / cutting mechanism * Instability * Difficulty weight-bearing * Rule-in test: * Lachman test — NPTE’s #1. * Rule-out clues: * Slow swelling → Meniscus * Posterior sag → PCL * Medial pain → MCL * NPTE trap: * Delayed swelling means NOT ACL. * Best treatment: * Early ROM, quads, swelling control, gait normalized. * Mock question included: Yes — test yourself before you move on.

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