The following are the 2 primary categories of acute osteomyelitis: hematogenous osteomyelitis and direct or contiguous inoculation osteomyelitis. Hematogenous osteomyelitis is an infection caused by bacterial seeding from the blood.Acute hematogenous osteomyelitis is characterized by an acute infection of the bone caused by the seeding of the bacteria within the bone from a remote source.This condition primarily occurs in children. The most common site is the rapidly growing and highly vascular metaphysis of growing bones.he following are the 2 primary categories of acute osteomyelitis: hematogenous osteomyelitis and direct or contiguous inoculation osteomyelitis. Hematogenous osteomyelitis is an infection caused by bacterial seeding from the blood.