Our expert says:
Pain on the outside of the knee, or lateral aspect of the knee joint, is commonly caused by lateral meniscus tears, lateral collateral ligament injuries or IT band tendonitis.
Please let her see a biokineticist - it may be the way she runs, her shoes or her gait that causes unneccessary strain on the soft tissue of the knee and if you don't fix this with training, other shoes etc the problem will keep on repeating itself. You will find a biocineticist in the yellow pages of the telephone book. Alternatively try to find a doctor that specializes in sports medicine.
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