Osteocutaneous flap prefabrication in rats

Area of Science:

• Plastic Surgery
• Regenerative Medicine
• Biomaterials Science

Background:

• Composite tissue defects involving skin and bone are common challenges in reconstructive surgery.
• Vascular osteocutaneous flaps are ideal but not always obtainable.
• Osteocutaneous flap prefabrication offers an alternative, with two primary techniques described in literature.

Purpose of the Study:

• To compare the efficacy and viability of two distinct osteocutaneous flap prefabrication methods.
• To evaluate the microangiographic, scintigraphic, and histologic outcomes of each prefabrication technique.
• To determine the optimal prefabrication strategy for composite tissue reconstruction.

Main Methods:

• Two prefabrication methods were tested in a rat model: (1) skin grafting a vascularized osseous segment and (2) implanting an osseous graft into an axial skin flap.
• Control groups included elevated vascularized bone with skin, elevated bone flap, and prefabricated skin flap.
• Vascular patency, bone appearance, bone scintigraphy, metabolic activity, and histologic viability were assessed at 4 weeks.

Main Results:

• Microangiography revealed patent vascular pedicles and comparable bone appearance across all groups.
• Bone scintigraphy confirmed viability in all prefabrication groups, with no significant difference in radioactivity values.
• Histologic examination demonstrated viable bone marrow, osteoblasts, and vascular channels in all bone-containing flaps.

Conclusions:

• Both tested osteocutaneous flap prefabrication methods demonstrate comparable viability and histologic outcomes.
• Neither method showed superiority in terms of vascular patency, bone appearance, or metabolic activity.
• These findings suggest both prefabrication techniques are viable options for reconstructing composite tissue defects.