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Type:
Educational Exhibit
Keywords:
Trauma, Education and training, Education, Diagnostic procedure, Ultrasound, Musculoskeletal system, Musculoskeletal joint, Anatomy
Authors:
N. Romano1, M. Marino2, I. Mussetto3, A. Fischetti1, A. Muda1; 1Genova/IT, 2Roma/IT, 3Genoa/IT
DOI:
10.1594/ecr2017/C-0637
Findings and procedure details
Injuries at the MCP joint are often open and occur with the joint in flexion with laceration of extensor tendon [5] (Fig.5,
Fig.6).
The disruption of the central slip causes the “boutounniere deformity” that is a pathologic flexion at the PIP joint with hyperextension at DIP joint.
The most common mechanism of injury is a direct trauma or a forced flexion of an actively extended PIP joint (Fig.7).
Injuries at the DIP joint may disrupt the terminal extensor tendon,
which is dorsally and superficially located at this level.
The most common mechanism of injury is a sudden flexion of the DIP joint with the resistance force directed along the long axis of the finger[4].This type of lesion,
called “mallet finger”,
is characterized by a deficit of DIP joint extension.
This can be the result of the rupture of the extensor tendon (“soft tissue mallet finger") or can be secondary to an avulsion of the extensor tendon from the distal phalanx with a small fragment of bone which remains attached to the tendon (“bony mallet finger”)[6] (Fig.8,
Fig.9,
Fig.10).