Anterior cruciate ligament (ACL) deficiency:

There is usually a plateau or double peak that occurs in the midportion of knee extension. See below.

This is because the ACL controls a portion of the glide and rotation during mid range knee extension.

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One of the most common problems at the knee is what has loosely been described as anterior knee pain. This term encompasses a huge range of syndromes and is most effectively treated conservatively.

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A double hump (M shape) will often be seen (see below) in people with meniscal dysfunction. 

This is probably due to impingement during normal joint motion and reflex inhibition. 

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Opposite curve deformations are often seen in the hamstrings and quadriceps curve data. See below. 

This is probably a reflection of the pain experienced during the movement and is present in both curves at the same point in ROM because the articular surfaces are involved. 

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