Anatomy And Fluid Mechanics Analysis Of Collateral Circulation In Fingertip Replantation With Single Artery Anastomosis

ObjectiveTo study the anatomical characteristics of finger arterial collateral in the distalfingers and analysis the phenomenon of fingertip replantation with single anastomosisof collateral return and investigate the Fluid Dynamics.MethodsLatex perfusion for ten fresh cadavers hand specimen, the number and diameter offinger arterial collateral were observed in the distal fingers by microsurgical anatomy.The angle of collateral and the backbone of the artery were observed in five fingerartery cast specimens.A fluid dynamics model of fingertip replantation consistent witha single artery were established by a simple device, the phenomenon of collateral returnwere observed.Eighty-five cases of fingertip replantation that survived after singleartery anastomosis were involved in the study.ResultsThe number of finger arterial collateral in the distal fingers is12.7±3.2. thediameter is0.32±0.08mm.About60.3%of The angle of collateral and the backbone ofthe artery between30°～60°,the finger arterial arch collateral angle close to90°.Observed the phenomenon of ideal liquid collateral return from Fluid Dynamics model of fingertip replantation consistent with a single artery.Eighty-one cases of theEighty-five replanted fingertips survived,four cases were lost.The overall survival ratewas95.3%.ConclusionWe should be kept the finger artery collateral of proximal anastomotic, shortenthe distance of the finger arterial anastomotic to the collateral.analysis the phenomenonof fingertip replantation with single anastomosis of collateral return by Bernoulli’s law(ρgh+ρv2+p=C), the phenomenon is the main mechanism of survival for fingertipreplantation with single anastomosis.