hi and welcome to HCM,
is inflammatioon of the bone or bone marrow
caused most commonly by bacterial infection.
staplylococcus aureus is the most common bacteria involved in all forms of osteomyelitis.
These microorganisms may infect bone either via the bloodstream or from local areas of infection such as in cellulitis
or penetrating trauma
or sometimes due to iatrogenenic reasons . as you have mentioned about pus discharge , yes osteomyelitis is the infective process and leads to formation of necrotic areas and pus formation.
long bones like tibia ,fibula
, vertbrae are more susceptible to infection.
Osteomyelitis often requires prolonged antibiotic therapy, with a course lasting a matter of weeks or months. it also may require surgical debridement. Severe cases may lead to the loss of a limb nad quadraplegia as in your case.
i hope i answered your query.
get well soon , take care.