The ACL connects the anterior tibial plateau to the posterior medial wall of the lateral femoral condyle, acting as the primary restraint against anterior tibial translation and rotational instability at the knee.
Resists anterior tibial displacement and controls rotational stability — the mechanism that makes pivoting sports hazardous for this structure.
ACL rupture is one of the most common serious sport injuries, occurring without contact during cutting or landing. Lachman and anterior drawer tests assess integrity. Surgical reconstruction is recommended for athletically active individuals.
Complete or partial tear producing immediate swelling, instability on pivoting, and a positive Lachman test — often accompanied by a pop and the knee 'giving way.'
Re-rupture of a reconstructed ACL occurring in up to 20% of young athletes within five years, often from premature return to sport.
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