Which statement correctly describes a random pattern local flap as opposed to an axial pattern flap?
- A Its survival depends on the subdermal plexus, so its length-to-width ratio should generally not exceed 1:1 to 1.5:1 ✓
- B It is supplied by a single named artery running along its long axis
- C It can be raised with any length regardless of width because of choke vessel recruitment
- D It requires microvascular anastomosis for survival
Correct answer: A. Its survival depends on the subdermal plexus, so its length-to-width ratio should generally not exceed 1:1 to 1.5:1
Explanation
B random pattern flap has no defined cutaneous artery and survives on the random subdermal plexus, so its base-to-length design is limited to roughly a 1:1 to 1.5:1 ratio to avoid distal necrosis. An axial pattern flap, such as a groin or deltopectoral flap, contains a named arteriovenous pedicle along its axis and can be made much longer. Microvascular anastomosis defines a free flap, not a random local flap.
Reference: Bailey and Love's Short Practice of Surgery, 27th ed.
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Written and medically reviewed by the StethoPrep medical team.