The 34-year-old was operated on over a six-hour period on Sunday afternoon following the fall, repairing a compound fracture of his right humerus and his upper-right femur to re-attach the broken ball joint.
A broken right tibia beneath the knee was also discovered upon further scans, not requiring surgery at this point, and Herfoss received a blood transfusion on Thursday following a loss of blood in the incident and subsequent operation.
In these initial stages of his recovery, while still being hospitalised in the Top End, Herfoss has already been mobile in a wheelchair around the hospital and has been allowed to put touch pressure on his leg.
Two-time ASBK champion Herfoss had starred on his way to victory in Saturday afternoon's opening Superbike race of the Darwin Triple Crown, before unfortunately crashing heavily on the opening lap of race two on Sunday.
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