Management of Bone Loss in Orthopaedic Surgery Using the Masquelet Technique or Transport Nails

Inclusion Criteria: * Patient ≥ 18 years * Minor patient, able to consent to data collection, with the consent of the owner(s) * Patient consulting for a medical reason involving a loss of bone substance in the lower limb in an investigating centre linked to one of these aetiologies for which a reconstruction procedure using a transport nail or Masquelet technique is envisaged: * Tumour pathologies requiring * Septic or aseptic pseudarthrosis * Traumatic pathology * Infectious pathologies Exclusion Criteria: * Patients under guardianship or curatorship, * Individuals deprived of their liberty by judicial or administrative decision, * Individuals receiving involuntary psychiatric care requiring the consent of their legal representative, * Individuals unable to express their consent, * Individuals under legal protection, * Patients with an indication for bone reconstruction using a technique other than the Masquelet technique and nail transport, * Patients not covered by a social security scheme, * Patients ineligible for bone reconstruction due to their comorbidities