Orthopaedic Hand Trauma CH32 (1)

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SECTION 3  | Tendon Injuries

Figure 32.1  Mechanisms of injury for mallet finger.

Extensor tendon

Collateral band

Mallet injury

Central band

Terminal tendon

FDP

FDS rupture

Lateral band

Lax volar plate

Lumbrical muscle

Transverse retinacular ligament

Interosseous muscle

Figure 32.2  Mechanism of swan neck deformity in the setting of mallet finger. FDS, flexor digitorum superficialis; FDP, flexor digitorum profundis.

EVALUATION

■ ■ Patient’s history usually includes mechanism of injury, and the patient will usually present in the acute phase.