You examine a patient who has a condition in which each time his index finger is flexed and extended, there is an audible "snap." Which of the following is the likely cause of this "trigger finger?"
A) infection in the midpalmar space
B) osteoarthritis of the metacarpophalangeal joint
C) carpal tunnel syndrome
D) thickening of the fibrous digital sheath and swelling of the flexor tendons
E) calcification of the origin of the lumbrical muscle
Ans: D
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