Proximal Interphalangeal (PIP) Joints Definition

The proximal interphalangeal (PIP) joints are the middle knuckles of the fingers (the thumb does not have a PIP joint).

Editor's Top Picks

Medical illustration of a hand with early stage swelling and marginal erosions

Hand Rheumatoid Arthritis Signs and Symptoms

Medical illustration showing late state rheumatoid arthritis joint destruction and deformity in the hands

Treatments for Rheumatoid Arthritis in Hands

Medical illustration of a hand with rheumatoid arthritis symptoms, including swelling and marginal erosion in the joints

Hand Pain and Rheumatoid Arthritis