Diseases of the nail plate and tissues surrounding it. The concept is limited to primates.

A type of inflammatory arthritis associated with PSORIASIS, often involving the axial joints and the peripheral terminal interphalangeal joints. It is characterized by the presence of HLA-B27-associated SPONDYLARTHROPATHY, and the absence of rheumatoid factor.

The thin, horny plates that cover the dorsal surfaces of the distal phalanges of the fingers and toes of primates.

Rods of bone, metal, or other material used for fixation of the fragments or ends of fractured bones.

Excessive lateral nail growth into the nail fold. Because the lateral margin of the nail acts as a foreign body, inflammation and granulation may result. It is caused by improperly fitting shoes and by improper trimming of the nail.