Laparotomy is one of the most common surgical procedures performed for abdominal trauma. The essence of a successful trauma laparotomy outcome relies on a methodical sequence of steps, surgical knowledge of maneuvers, and sound surgical decisions based on evidence and experience. Surgical maneuvers have been developed over years of experience to enable the surgeon to gain access to injuries of deep abdominal structures, identify these injuries and address them appropriately. Complete left medial visceral rotation or Mattox maneuver is one such intraoperative surgical innovation which has revolutionized the trauma surgery since the 1970s.

Definition

Mattox Maneuver, also known as a left medial visceral rotation, is a surgical step to explore and handle Zone 1 and 2 retroperitoneal injuries (aorta, left iliac and pelvic vessels). It starts with incising the parietal peritoneum at the white line of Toldt from the sigmoid colon to the splenic flexure. The spleen, tail of the pancreas, left kidney, and stomach are mobilized and reflected medially during this maneuver to explore the deeper structures. [1] https://www.ncbi.nlm.nih.gov/books/NBK532262/

PS: I don't recommend using "Mattox maneuver" unless validated by your client. Most definitely, "surgical maneuver".

Creio que o termo se refere às manobras realizadas para expor uma área cirúrgica durante o procedimento. Posição em que o corpo está, o tipo de decúbito para facilitar o acesso cirúrgico. Creio que adicionar a palavra "surgical" deixa claro em que contexto estamos usando a expressão.

--------------------------------------------------
Note added at 9 hrs (2022-03-30 00:42:10 GMT)
--------------------------------------------------

Extended Kocher’s manoeuvre is a part of Cattel–Braasch manoeuvre and generally consists of full exposition of the inferior vena cava (IVC)

Aqui eles nominam uma manobra (Kocher) que consiste na exposição (exposition) da veia cava inferior, na minha opinião usar o termo "surgical exposition maneuver" é uma boa escolha neste contexto.
Aqui vai o link para o artigo
https://link.springer.com/chapter/10.1007/978-1-84800-251-7_...