Dr. Kevin Yip

Dr Kevin Yip
Orthopaedic Surgeon
MBBS(UK), FRCS(EDIN), FAM(SING), FHKCOS(ORTHO)

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Resisted extension of the knee

Positioning.

The subject lies prone with the knee flexed to 70°. The examiner stands level with the thigh and leans over the subject. The ipsilateral hand is placed on the distal end of the thigh to stabilize it on the couch. The elbow of the other
arm is positioned ventrally around the distal end of the lower leg.

Procedure.

Ask the subject to extend the knee,and resist the movement. In order to be able to withstand even the strongest extension,the hand of the supporting arm may grasp the stabilizing arm.

Common mistakes:

• In strong subjects the extension of the knee can not be opposed if the examiner is not leaning in the direction of the subject’s head.
• Hyperlordosis may elicit pain from sacroiliac structures or the lumbosacral junction.

Anatomical structures tested:

Muscle function:

• Quadriceps femoris.

Common pathological situations:

• Pain in the thigh is due to a lesion of the
quadriceps.
• Weakness is the result of a third lumbar root
lesion or a femoralis palsy.

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