Hip-Knee-Ankle: a functional unit

Patient : Can knee problems cause swelling of the foot and ankle? My 13 year old daughter is a dancer and has started having knee pain. yesterday she woke up with a swollen foot and ankle. i didn't know if they could possibly be related.
Doctor :   The lower limbs are a functional unit, the big joints as hip, knee and ankle move as one depending on each other, with s ynergistic effect to achieve a normal gait pattern and effective movements, so when one of these joints is affected, the others feel the effects too. Sometimes when one is experiencing pain in one of these joints, the gait pattern gets modified in order to avoid the pain, this is what we call antalgic gait.

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