A<unk> , typically defined as proximal interphalangeal joint (PIP) hyperextension with concurrent distal interphalangeal joint flexion, occurs in approximately 50% of patients with Rheumatoid Arthritis.
This deformity is not unique to Rheumatoid Arthritis, because it may also be congenital or traumatic in nature. Multiple surgical procedures are available for the correction of this digital abnormality. The deformity of the finger or fingers must be staged accurately to use the most appropriate surgical technique. The staging of the deformed finger is based on the condition of the articular cartilage (determined by radiography) and on the flexibility of the proximal interphalangeal joint.
Swan neck deformity
Haglund deformity
Barrel chest
Winged scapula
Rocker bottom foot
Boutonniere deformity
Carpometacarpal bossing
Kyphoscoliosis