*Review* **Forearm Fracture Nonunion with and without Bone Loss: An Overview of Adult and Child Populations**

**Sara Dimartino, Vito Pavone, Michela Carnazza, Enrica Rosalia Cuffaro, Francesco Sergi and Gianluca Testa \***

Department of General Surgery and Medical Surgical Specialties, Section of Orthopaedics and Traumatology, University Hospital Policlinico "Rodolico-San Marco", University of Catania, 95123 Catania, Italy; saradimartino1@gmail.com (S.D.); vitopavone@hotmail.com (V.P.); michela.carnazza@libero.it (M.C.); enricacuffaro@outlook.it (E.R.C.); fsrgbl33@gmail.com (F.S.)

**\*** Correspondence: gianpavel@hotmail.com

**Abstract:** Nonunion occurs in 2–10% of all forearm fractures due to different mechanical and biological factors, patient characteristics, and surgeon-dependent causes. It is a condition that causes functional and psychosocial disability for the patient because it is a unique anatomical segment in which all the bones and structures involved embody a complex functional unit; therefore, it is a challenge for the orthopedic surgeon. The ultimate goal of the care of these patients is the restoration of function and limitations related to impairment and disability. The aim of this review is to provide an extended description of nonunion forearm fractures, related risk factors, diagnosis, classification systems, and the available evidence for different types of treatment as a tool to better manage this pathology.

**Keywords:** forearm; nonunion; epidemiology; risk factor; children; treatment; external fixation; bone graft
