It can be serious: A fall could cause various injuries. You have a effusion which is swelling & fluid in the knee. This will cause difficulty motion and can usually be treated conservatively or by aspirating the fluid. However with the limited information provided, more serious injuries are possible such as a fracture or ligament injury. To be safe i would make an appointment to get evaluated by a physian.
Answered 3/26/2013
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Consult YOUR ORTHO: Yes it may be serious, can not say without examination and xray so make an appt with your orthpedic doctor asap or go to er.
Answered 1/16/2019
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