This is the first pediatric shoulder joint model developed at an INSERM lab at LaTIM, France, to evaluate pediatric shoulder joint biomechanics. Pediatric joint models are scarce in OpenSIM and scaling down adult models does not help determine child-specific biomechanics in the areas of shoulder disorders such as Obstetric Brachial Plexus Palsy (OBPP). The goal of this project is to determine the impact of abnormal musculoskeletal structures in OBPP pathology.