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A mallet finger, also known as hammer finger or PLF finger or Hannan finger, is an extensor tendon injury at the farthest away finger joint. [2] This results in the inability to extend the finger tip without pushing it. [3] There is generally pain and bruising at the back side of the farthest away finger joint. [3]
Mallet finger is acquired due to injury to the thin extensor tendon that functions to straighten the end (DIP) joint of a finger. [8] Jamming of the finger induces a rupture of the extensor tendon or a broken bone at the tendon's site of attachment. [9] This results in a droopy and crooked appearance of the end joint of the finger, resembling a ...
Swan neck deformity has many of possible causes arising from the DIP, PIP, or even the MCP joints. In all cases, there is a stretching of the volar plate at the PIP joint to allow hyperextension, plus some damage to the attachment of the extensor tendon to the base of the distal phalanx that produces a hyperflexed mallet finger.
Mallet finger occurs in similar situations as a jammed finger. The tendon that extends the tip of the finger is torn due to trauma causing it to flex beyond normal range. [17] It is characterized by a difficulty extending the finger or opening the hand. [19] Symptoms common to jammed fingers are likely, though a painless mallet finger is not ...
As a result, the joint is stable during full flexion while the relaxed collateral ligaments allows lateral and rotation movements during extension. [4] The tendons of interosseous and lumbricales add to the lateral stability of the joint. [1]
Without the appropriate treatment, the finger becomes a hammer finger. It would correspond to the group B of the Albertoni classification. [2] It is very common in motorcycle riders and soccer joggers, caused by hyperflexion when the tendon is exercising its maximum tension (the closed hand tightening the clutch lever or the brake lever). [3] [4]
Joints of the hand, X-ray Interphalangeal ligaments and phalanges. Right hand. Deep dissection. Posterior (dorsal) view. The PIP joint exhibits great lateral stability. Its transverse diameter is greater than its antero-posterior diameter and its thick collateral ligaments are tight in all positions during flexion, contrary to those in the metacarpophalangeal joint.
This flexion deformity of the proximal interphalangeal joint is due to interruption of the central slip of the extensor tendon such that the lateral slips separate and the head of the proximal phalanx pops through the gap like a finger through a button hole (thus the name, from French boutonnière "button hole"). The distal joint is ...