• Risk factors associated with the occurrence of treatment failure at Day 45 after surgery [ Time Frame: at 45 days ]
  Risk factors among patients' baseline characteristics, biological or microbiological analysis, or antibiotic treatments, significantly associated with the occurrence of treatment failure during a 45-day follow up period after surgery.
• Impact of antibiotic treatment duration on the occurrence of treatment failure at Day 45 after surgery [ Time Frame: at 45 days ]
  Comparison between 7 days and 10 days of antibiotic treatment duration on the number of patients presenting treatment failure at Day 45 after surgery.

Spinal cord injured (SCI) population is subject to pressure ulcers because of numerous risk factors: neurological disorders, which reduce ability to mobilization, potential, undernutrition, confinement to bed, and vascular disorders promoting the lesions.

Despite the attention given to preventative strategies, in this population, prevalence of pressure ulcers varies from 10% to 30%, with an annual incidence rates range ranging from 20%-% to 31%.

In community-dwelling SCI population, stages III and IV pressure ulcers account for 25% of total ulcers observed.

They are a major cause of healthcare centers admissions or homecare nursing. Duration of ulcers could vary from 1 week to 3 years.

Also, their occurrence is associated with potential repeated hospitalizations and with a longer length of stay. Furthermore, pressure ulcers are an important economic burden to the health care system.

Pressure ulcers interfere with the patient's physical, psychological, and social well-being and impact the overall quality of life.

Over recent years, an increased pressure ulcer prevalence has been reported. Therefore, they are frequent and their clinical spectrum is wide. They also readily become superinfected and can lead to sepsis.

Establishing the diagnosis of osteomyelitis in this setting is challenging, and physicians often struggle with the appropriate therapeutic management.

A recent review did not find evidence of benefit of antibacterial therapy in osteomyelitis associated with pressure ulcers without concomitant surgical debridement and wound coverage. But this type of management remains controversial.

In a French referral center, patients with pressure ulcer-related osteitis benefit from a one-stage surgical management with bone shaving and flap covering, followed by a probabilistic post-operative antibiotic treatment, secondarily adapted to peroperative samples, for a total duration of effective antibiotic treatment of 7 or 10 days.

Thus, the investigators aim to evaluate this original strategy, identify risk factors for failure, and focus on the role of antibiotic treatment.

Inclusion Criteria:

• Patient ≥ 18 years;
• Spinal cord injured patients with pressure-related osteitis treated with flap coverage and short antibiotic treatment.

Exclusion Criteria:

• Patient < 18 years;
• Patient under under guardianship;
• Patient with concomitant infections;
• Patient having declare his opposition to study participation.