Trigger finger or trigger thumb is a type of stenosing tenosynovitis in which the sheath around a tendon in a thumb or finger becomes swollen and restricts the tendon's movement. Affected joints may become painful to straighten once bent, and may make a soft crackling sound when moved.

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eMedicine - Trigger Finger
Physician article provides an introduction, indications, anatomy, contraindications, treatment, complications, and prognosis.
Mayo Clinic: Trigger Finger
Learn the symptoms, causes, risk factors, and when to seek medical advice.
MedicineNet - Trigger Finger (Stenosing Tenosynovitis)
Explains this condition including symptoms, causes, medications, and treatment.
NHS Choices: Trigger Finger
Provides information on this painful condition that affects the tendons in the hand. Includes details of symptoms, causes, diagnosis, treatment and complications.
Trigger Finger (Flexor Tendinitis)
Animated views of what occurs with this condition from Hand World.
Trigger Finger / Tenosynovitis
From Wheeless' Textbook of Orthopaedics. Provides clinical manifestations, treatment, operative considerations, and surgical photographs.
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