In a 60-degree Z-plasty, what percentage increase in length is anticipated for the overall wound?

• A. 50%
• B. 60%
• C. 75%
• D. 100%

Answer: (C)

In a 60-degree Z-plasty, the anticipated percentage increase in length for the overall wound is 75%. This method is utilized to lengthen and reposition a scar while also improving its cosmetic appearance. The mechanics of Z-plasty work on the principle that the lengthening achieved is directly correlated with the angle of the flaps being created.

At 60 degrees, each limb of the Z produces a significant increase in the length of the scar. Specifically, the lengthening effect is calculated using the formula that reflects the geometric properties of the triangles formed in the flaps. For a Z-plasty, as the angle increases, the amount of gain in length increases as well.

In the case of a 60-degree Z-plasty, the formula indicates a theoretical increase of 75% in length. This is an important concept in surgical practice, as it helps surgeons plan for tension relief and proper closure of skin wounds or scars in facial and other types of reconstructive surgeries. Understanding the mechanics behind Z-plasty allows for better surgical outcomes and improved patient satisfaction with the results.