Extensor Zone III Injury over the PIP joint.
Most commonly central tendon is injured, causing FDS to be unopposed, thus causing flexion of PIP
Disruption of central tendon causes lateral bands to be displaced volarly, causing them to act like flexors
FDP still intact
Disruption of central tendon causes lateral bands to be displaced volarly, causing them to act like flexors
Boutonniere deformity
Rheumatoid arthritis
Nursemaid's elbow
Volar PIP dislocation
Swan neck deformity
Flexion contracture of PIP joint
Drummer's wrist
Distal finger