General

Over 100 types of arthritis affect 46 million adults in the U.S., mostly classified into one of two groups: degenerative arthritis or inflammatory arthritis.

Inflammation is the root cause of arthritis. Joints vary in risk; certain joints more prone to pain include the hips, knees, and shoulders.

Spondyloarthritis can refer to several related diseases. It may be described as axial or peripheral spondyloarthritis to classify which joints are being affected.

There are various common conditions that can cause knee swelling, referred to by doctors as “knee effusion.” Others may call it “water on the knee.”

Crepitus is the medical term for cracking or popping sounds in a joint such as the knee. Crepitus can have associated pain symptoms and treatments.

Enthesopathy is the medical name for any disease or disorder that affects the point where a ligament or tendon attaches to bone.