Avulsion of extensor tendon give rise to?
Mallet finger
Dupuytren's contracture
Trigger finger
Swan neck deformity
It is the flexion deformity of the distal interphalangeal joint usually due to avulsion of extensor tendon of distal phalanx. Ref: Current Diagnosis & Treatment in Ohopedics 3/e, page 538,564-65.