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Quadriceps weakness can be caused by various injuries to the knee or hips, acquired myopathies (diseases that affect muscle tissue) such as Lyme disease and poliomyelitis, inherited myopathies such as certain muscular dystrophies and stroke, or neurological diseases such as multiple sclerosis or Bellâs palsy.
1 Since the ears are made up of cartilage, it can also be affected and ear involvement is seem in 9 out of 10 cases of relapsing polychondritis. 2  Winklerâs disease is a condition where a painful nodule forms on the upper parts of the ear (not the lobule) due to pressure or trauma.