Paratenonitis occurs where a tendon rubs over a bony surface. It is presented with acute

edema Edema (American English), also spelled oedema (British English), and also known as fluid retention, swelling, dropsy and hydropsy, is the build-up of fluid in the body's tissue (biology), tissue. Most commonly, the legs or arms are affected. S ...

and

hyperaemia Hyperaemia (also hyperemia) is the increase of blood flow to different tissues in the body. It can have medical implications but is also a regulatory response, allowing change in blood supply to different tissues through vasodilation (widenin ...

of the paratenon with infiltration of inflammatory cells. After few hours or few days,

tendon sheath A tendon sheath is a layer of synovial membrane around a tendon. It permits the tendon to stretch and not adhere to the surrounding fascia. It contains a lubricating fluid (synovial fluid) that allows for smooth motions of the tendon during muscl ...

is filled by fibrinous exudate and leads to

crepitus Crepitus is "a grating sound or sensation produced by friction between bone and cartilage or the fractured parts of a bone". Various types of crepitus that can be heard in joint pathologies are: *Bone crepitus: This can be heard when two frag ...

. In chronic paratenonitis fibroblasts appear along with perivascular lymphocytic infiltrate. Peritendinous tissues become macroscopically thickened and new connective tissue adhesions occur. In paratenonitis, inflammatory cells are found in the cellular elements of the paratenon and in the vascular ingrowth.

References

Soft tissue Skeletal system

Tendons A tendon or sinew is a tough band of dense fibrous connective tissue that connects muscle to bone. It sends the mechanical forces of muscle contraction to the skeletal system, while withstanding tension. Tendons, like ligaments, are made of ...

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