<prompt> Sudecks atrophy is associated withOsteoporosisOsteophyte formationOsteopeniaOsteochondritis  <response>: Reflex sympathetic dystrophy Also called as Sudecks dystrophy or Complex regional pain syndrome - 1 Disabling disorder of unknown pathophysiology with a variable symptom complex and many hypothesized causes and mechanismsFeatures of CRS - 1Intense exaggerated pain Vasomotor disturbanceDelayed functional recoveryHyperhidrosis, Osteopenia, Atrophic skin changesLankford and Evan stagining Stages Duration Features Acute Initial 3 months Pain Swelling Sub-acute 3 - 9 monthsPain, stiffness osteopenia on X ray Chronic After 9 months Diminished pain with extreme osteopenia Refer: Mohindras Fundamentals of Ohopedics, 2nd edition, pg no. 97 