Patellar pain: Patellar pain syndromes are quite common in young female athletes. They are typically due to patellar tracking abnormalities or patellofemoral syndrome. The hard lump you feel could be a bone fragment called "bipartite patella", or less likely a "ganglion cyst". See a sports medicine doctor for physical exam and maybe an x-ray or MRI.
Answered 11/29/2014
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