Descriptive Single-center Retrospective Study of a Series of Cases of Clavicle Pseudarthrosis: Epidemiology, Surgical Management, and Functional Outcomes

1. Study identification Study title: PSEUDO-CLAV - Single-center retrospective descriptive study of clavicle nonunion (pseudarthrosis): epidemiology, surgical management, and functional outcomes PSEUDO-clav\_Notice non oppositi… Study type: Observational study (retrospective, single-center) using existing medical records and imaging Study sponsor / data controller: CHU de Brest Scientific lead (principal investigator): Dr Agathe YVINOU (Orthopaedic \& Trauma Surgery, CHU de Brest) Data Protection Officer (DPO) contact: protection.donnees@chu-brest.fr 2. Why is this study being done? A clavicle nonunion (pseudarthrosis) is when a broken collarbone does not heal as expected and may cause pain, reduced shoulder function, and lower quality of life. Surgery is often used, but because this condition is uncommon, the investigators want to better understand: who is affected, which surgical strategies are used, how often the bone heals after surgery, what functional recovery and complications look like in real-life practice. 3. Goal of the study (use/keep this "fill-in" format) The goal of this observational study is to describe clavicle nonunion cases treated surgically at CHU de Brest and to estimate how often the clavicle heals after surgery, using information already collected during routine care. The main questions it aims to answer are: How often does the clavicle heal ("consolidate") after surgery? Main measure: union rate at \~6 months after surgery (assessment window approximately 4-8 months). PSEUDO-clav\_Protocole\_scientifi… How do patients recover in terms of function and symptoms, and what complications occur? Examples: shoulder function scores (Constant and/or DASH), pain, return to work/sport, complications and re-operations. PSEUDO-clav\_Protocole\_scientifi… If there is a comparison group (optional wording): Researchers may compare different surgical strategies (for example, plate fixation alone vs. plate fixation plus bone g