What is the term for the traumatic removal of skin and SQ tissue separating from their blood supply?

The term that accurately describes the traumatic removal of skin and subcutaneous (SQ) tissue as they separate from their blood supply is "degloving." This condition typically occurs in severe trauma cases where a significant section of skin and underlying tissue is completely detached from the body but still has the potential for blood supply disruptions. Degloving injuries are particularly serious because they can lead to significant complications, including infection and necrosis of the skin due to loss of blood flow.

Avulsion refers to a type of injury where a portion of skin and tissue is forcibly torn away, but it does not necessarily imply complete separation of the tissue from its blood supply. Debridement is a medical procedure involving the removal of dead, damaged, or infected tissue to improve the healing potential of the remaining healthy tissue, rather than an injury type itself. Amputation refers to the surgical removal of a limb or part of a limb, which is different from the concept of tissue detachment described in the question.