The study was terminated prematurely due to the inability to collect retrospective clinical data within the required contractual and regulatory deadlines. Although ethical approval was obtained, data collection was not performed.

This study aims to collect real-world clinical data to gather information on the performance and safety of the TriOSS® when used according to its intended purpose and current clinical applications. The results of the clinical study will serve as clinical evidence for the device's clinical evaluation.

Inclusion Criteria:

• Adult males or females (age > 18 years old);
• Patients with osseous defects, either of trauma origin, surgically created, or associated with spinal degenerative diseases that require segmental fusion of the spine.
• Patients with bone skeletal defects that are not intrinsic to the stability of the bone structure.

Exclusion Criteria:

• Signs of local or systemic acute/ active or chronic infections;
• Metabolic affections;
• Severe degenerative diseases, conditions in which general bone grafting is not advisable;
• Implementation sites that allow product migration;
• Conditions which require structural support in the skeletal system;
• Conditions where the implantation site is unstable and not rigidly fixated;
• Sensibility to the implantable materials;
• Known hypersensitivity to the implant material.

The study population consists of adult patients (> 18 years old) undergoing orthopaedic surgery after bone defect.