PMID: 26143965 J Hand Surg Am. 2015 Aug;40(8):1667-8. Epub 2015 Jul 3.

Bennett Fracture.

A 28-year-old right-hand-dominant man fell off his bicycle and fractured the base of his right thumb metacarpal. Radiographs identified an intra-articular fracture of the base of the thumb metacarpal associated with dislocation of the trapeziometacarpal joint. The dislocation was reduced in the emergency department and the thumb was immobilized with a splint.

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Base of Thumb Fractures Anatomy Muscles QID: 218133 (SBQ21H.79)

QID 218133 (Type "218133" in App Search)

A 21-year-old male fell off of his mountain bike and sustained the injury shown in Figure A. He is counseled that he should have an open reduction and internal fixation given his fracture type and amount of displacement. Which of the following muscles provide the deforming forces on the fracture and make closed reduction less favorable in the setting of significantly displaced intra-articular fracture-dislocations of the base of the thumb?

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Abductor pollicis brevis, flexor pollicis brevis, opponens pollicis

10%

72/752

Adductor pollicis, flexor pollicis brevis, opponens pollicis

15%

115/752

Abductor pollicis longus, extensor pollicis longus, adductor pollicis

57%

427/752

Adductor pollicis, flexor pollicis longus, abductor pollicis brevis

62/752

Abductor pollicis longus, extensor pollicis longus, opponens pollicis

69/752

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