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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.
Quadricep strains are of three types; 1  A mild or (grade I) strain, which is a slightly pulled muscle without tearing of muscle or tendon fibers. There is no loss of strength. 2  A moderate or (grade II) strain, which is a tearing of fibers in a muscle or tendon or at the attachment to the bone. Strength is diminished.