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Cruciate ligaments lesion
An anterior cruciate ligament lesion is frequently an isolated lesion. It can be the result of a hyperextension-medial rotation trauma (e.g. the athlete who, after a sprint, quickly decreases his speed and rotates his knee).
It can be a combined lesion as well, together with the MCL and the medial menisc.
An ACL lesion finally could cause a longitudinal meniscal tear. A total or a partial rupture doesn't necessarily lead to functional instability.
Cruciate ligaments lesion (2)
A posterior cruciate ligament lesion is more invalidating (e.g. dashboard injury). A slight posttraumatic capsular reaction is to be expected. Some tests from the basic examination (drawer test, shearing strain) may be positive but, as pointed out before, the reliability of those tests is questionable.
Medical imaging and/or arthroscopy will be necessary.
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