Heterotopic ossifications (HO) are an alteration characterized histologically and radiographically by the formation of normal
bony bone in soft tissues where its formation does not normally correspond. The pathology can affect the bones or the
joints. It can originate in any extraskeletal location, where undifferentiated mesenchymal cells are found. Multifactorial
etiology and cause still completely unknown. They can be found associated with arthroplasty, burns and a wide group of
neurological injuries, including spinal cord injury, traumatic brain injury, anoxic brain injuries, cerebrovascular accidents,
etc... In patients with central nervous system (CNS) damage, HO is a common complication, ranging from 11% to 76% of
cases. In spinal cord injury, the frequency of HO varies from 5% to 60% depending on the study and whether the
diagnosis is based on clinical symptoms or standard radiographic results. Symptomatic HO develops in approximately
10% of patients. The most commonly affected joint is the hip. Next in frequency is the knee, with a medial location
(54.7%). It can also appear in other places such as the elbow, spine... less frequently. The appearance in the ischium is
much less frequent. The indication for surgical treatment will only be in case of mobility restriction, hygiene or clothing
limitation and risk of ulceration. This is going to be the case

Heterotopic ossifications (HO) are an alteration characterized histologically and radiographically by the formation of normal
bony bone in soft tissues where its formation does not normally correspond. The pathology can affect the bones or the
joints. It can originate in any extraskeletal location, where undifferentiated mesenchymal cells are found. Multifactorial
etiology and cause still completely unknown. They can be found associated with arthroplasty, burns and a wide group of
neurological injuries, including spinal cord injury, traumatic brain injury, anoxic brain injuries, cerebrovascular accidents,
etc... In patients with central nervous system (CNS) damage, HO is a common complication, ranging from 11% to 76% of
cases. In spinal cord injury, the frequency of HO varies from 5% to 60% depending on the study and whether the
diagnosis is based on clinical symptoms or standard radiographic results. Symptomatic HO develops in approximately
10% of patients. The most commonly affected joint is the hip. Next in frequency is the knee, with a medial location
(54.7%). It can also appear in other places such as the elbow, spine... less frequently. The appearance in the ischium is
much less frequent. The indication for surgical treatment will only be in case of mobility restriction, hygiene or clothing
limitation and risk of ulceration. This is going to be the case