Which statement is true regarding complex surgical repairs?

Complex surgical repairs are defined by their technical intricacy and the extent of the tissue being repaired. One of the hallmark characteristics of complex surgical repairs is that they may require extensive undermining. This technique involves loosening the tissue surrounding the repair site, which allows for more thorough mobilization of the skin and facilitates tension-free closure. Extensive undermining is often necessary to achieve a properly healed, aesthetically pleasing, and functional result, particularly in areas where tension on the skin is a concern.

In contrast, the other options do not apply to complex surgical repairs. For example, they typically require more time than intermediate repairs due to their complexity. Similarly, complex repairs do not involve only simple closures; they may require sophisticated techniques and additional manipulation of the tissue. Lastly, complex surgical procedures often necessitate advanced training and skills beyond what is required for simpler repairs, thereby making the notion that they do not require additional training inaccurate.