The word "laceration" comes from the latin "laceratio", Latin for "tearing, lacerating". Fingers are often cut:
Finger lacerations are often superficial, but a deep injury can transect a tendon. In this case, a thirty-two year old female lacerated her ring finger on a food preparation machine, and presented to a hand surgeon. The clinical examination was difficult, and the patient was referred for an MRI to better delineate the nature of the flexor tendon injury.
Sagittal gradient-recalled echo image:
The flexor digitorum profundus tendon is completely cut, with a 7 mm gap (red arrow) in the distal tendon. Interestingly, there is a second gap in the tendon (yellow arrow), just proximal to its insertion. Thus, there are two separate lacerations of the tendon, with a free-floating segment. These findings were confirmed at surgery. At surgery, it was discovered that the volar plate of the PIP joint was also cut.
Compare this to a normal flexor digitorum profundus tendon:
Lacerations usually are not referred for MR imaging, but when the clinical exam is difficult or confusing, a high-resolution MRI can often yield valuable pre-operative information.
Vic David MD