Thanks for taking my question. A person I am very close to suffers from post-polio syndrome. When he was aged 8 he was diagnosed with poliomyelitis. He is now aged 82. For the first time yesterday did he developed a hardening of his leg muscles, especially the right leg (not so much a stiffening), which made him very unsteady and worried that he would fall. Is this perhaps another symptom of worsening post-polio syndrome? If so, can you offer any remedy, mindful that this man s health otherwise is very good, according to his personal physician?