In the reconstructive ladder, a local random-pattern flap differs from an axial-pattern flap in which fundamental way?

• A Random flaps are based on a named arteriovenous pedicle from the deep fascia
• B Axial flaps are supplied by musculocutaneous perforators only, not direct cutaneous arteries
• C Random flaps can be raised with a 3:1 length-to-width ratio safely in all body regions
• D Random flaps rely on the dermal-subdermal vascular plexus without a dominant named vessel ✓

Explanation

Random-pattern flaps derive their blood supply from the non-specific dermal and subdermal vascular plexuses without reliance on a named vessel; their safe length-to-width ratio is limited to approximately 1.5:1 to 2:1 in most body regions to avoid distal ischemia. Axial-pattern flaps incorporate a known named direct cutaneous artery and vein along the longitudinal axis, allowing much greater length-to-width ratios and reliable perfusion. The distinction is clinically relevant for flap design and predicting viability.

Reference: Bailey & Love's Short Practice of Surgery, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.