The study is a monocentric, retrospective, non-randomized, non-controlled and consecutive series post-market study. The purpose of this study is to confirm safety, performance and clinical benefits of the Reconstruction System (implants and instrumentation) when used for temporary internal fixation and stabilization of fractures during the normal healing process.

The primary objective is the assessment of performance by analyzing fracture healing.

The secondary objectives are the assessment of safety by recording and analyzing the incidence and frequency of complications and adverse events. Relation of the events to implant, instrumentation and/or procedure should be specified. Subjects' outcomes will also be assessed.

The Reconstruction System is especially used to stabilize pelvic ring and acetabulum fractures. One site will be involved in this study. The aim is to include a maximum of 83 consecutive series cases who received the Zimmer Reconstruction System at the Azienda Ospedaliero Universitaria Senese (Siena, Italy) between 2010 and 2018. All potential study subjects will be required to participate to the Informed Consent process.

Baseline data from the preop, intraop, immediate post-op and last consultation visit will be available in medical notes and collected retrospectively. In addition, any complications since the last consultation visit at the clinic and information about the treatment of the complications will also be collected retrospectively.

Inclusion Criteria:

Patients having received the Zimmer Reconstruction System for temporary internal fixation and stabilization of fractures during the normal healing process

Exclusion Criteria:

• Off-label use
• Patients under the age of 18
• Severely comminuted fractures in which bone fragments are too small or numerous to adequately fix or maintain a reduced position
• Infection
• Metal sensitivity or intolerance
• Severe osteopenia and/or osteoporosis, or in the presence of marked or rapid bone absorption, metabolic bone disease, cancer, or any other tumor-like condition of the bone which may compromise fixation
• Sternal or spinal fractures
• Anatomical location in which the device would interfere with nerves, blood vessels, or other vital structures
• Patients with inadequate soft tissue coverage at the implant site

Consecutive series of cases implanted with the Zimmer Reconstruction System according to Zimmer Biomet's Instruction for USE (IFU) and who meet the inclusion criteria and none of the exclusion criteria.

If an enrolled participant received multiple implants, a dataset has been recorded per fracture site (1 fracture = 1 case). Therefore, all data will be presented in the number of cases.

mean time of 1.99 years after the surgery

Complications were collected fully anonymized and the Sponsor was not provided with raw data. Date of occurrence, the nature of the adverse event, whether the device was involved, which treatment was used and the treatment outcome were collected.

A limitation to this study is its retrospective and fully anonymized design. Due to the fully anonymized design, no further information on complications and adverse events can be collected for this study.