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Which muscle or tendon inserts on the front of the thigh and bears more load when the knees are flexed than extended?

This muscle or tendon feels maximum stress when supporting body weight with the knees flexed 90 degrees or more, but flexing the quadriceps with the leg straight doesn't involve it at all. It can ...
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How Can I Heal/Prevent Jumper's (Patellar Tendinitis) Knee?

About me: 29 years old 170 lbs Active (mountain biking, skiing, basketball) In the last year or so I've started to develop symptoms of what I think is Jumper's Knee (pain right beneath the kneecap ...