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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.
When it comes to the feet, RA typically affects the metatarsophalangeal (MTP) joints of the toes. When RA persistently affects the MTP joints, a gradual outward (lateral) shift in the toes can occur. This may cause both feet to develop bunions (hallux valgus). RA may also cause shifting of the forefoot and loss of stability, which leads to toe contractures, such as hammertoes.