Answer:
a bursa is a covering of a ligament or tendon that allows tendons to move and slide without causing friction. the bursa has a lubricant that helps everything run smoothly. bursa are usually protecting tendons as the run over joints. shoulders are really important and prominent.
having said that i'm not really sure what infracalcaneal bursitis is.
bursitis means the bursa is inflamed. thats all i got - could be calcium - google it
try this site
bursitis is a swelling which causes a lump. infra- is a prefix meaning "below". I'm not sure what "calcaneal" means but the liguistic root is probably the same as "calcium", a mineral found in bones and other places in the body. If that's true than Infracalcaneal Bursitis is a lump of swollen tissue under a bone or calcium deposit in your foot.
Basically bursitis is inflammation of a bursa.a bursa is a very thin fluid filled sac that usually lie between a bony point and a tendon (structure that connect muscle to bone) that needs to move. The bursa makes sure that the tendon doesn't rub up against the bony part and eventually tear. It allows smooth motion of the tendon over the bony area. So your infracalcaneal bursa lies in between you calcaneus (heel bone) and Achilles tendon. Most bursitis' occur due to tight muscles, which cause the tendon to push on the bursa and irritate it.