https://kidshealth.org/CookChildrens/en/parents/jumpers-knee.html
Jumper's Knee (Patellar Tendonitis) (for Parents) - Cook Children's
Jumper's knee, or patellar tendonitis, is an overuse injury that happens when frequent jumping, running, and changing direction damages the patellar tendon.
patellar tendonitisfor parentsjumperkneecook
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