Final answer:
Bursitis is the inflammation of the fluid-filled sacs that act as cushions between muscles, tendons, and bones. This condition can cause pain, swelling, and tenderness.
Step-by-step explanation:
Bursitis is the inflammation of a bursa near a joint. Bursae are fluid-filled sacs that act as cushions between muscles, tendons, and bones, reducing friction and allowing smooth movement. When these bursae become inflamed, it can cause pain, swelling, and tenderness in the affected area.
For example, prepatellar bursitis, also known as "housemaid's knee," is the inflammation of the bursa located between the skin and the patella bone. This condition is commonly seen in roofers or floor and carpet installers who do not use knee pads, as their knees are subjected to repetitive pressure and friction.
In conclusion, bursitis is the condition where the sacs containing synovial lubricating fluid become inflamed.