Cast Care

A cast stabilizes an injured bone or joint, but it also creates a rigid boundary around tissue that may continue to swell after the injury. Swelling within the limb can raise pressure inside the closed fascial compartments surrounding muscles, nerves, and vessels. As pressure rises, capillary blood flow falls. Nerves and muscles then become ischemic. The cast is not necessarily the original cause of the swelling, but a tight or unyielding cast can worsen the pressure problem by leaving too little room for expansion. A limb that looked satisfactory at application can deteriorate later as post-injury edema develops. Pain is often expected after a fracture or procedure. The concerning pattern is pain that is escalating, disproportionate to the injury, poorly relieved by prescribed analgesia, or triggered by passive stretch of the fingers or toes. This pattern suggests pressure is affecting tissue rather than ordinary post-injury discomfort.