Background: The lack of a common patient-reported outcome metric used among the orthopaedic population is a problem that has been previously identified by the American Academy of Orthopaedic Surgeons. The Patient-Reported Outcomes Measurement Information System (PROMIS) was developed by the National Institute of Health with the goal of creating a precise and efficient measurement tool for patient-reported symptoms, functioning, and health-related quality of life to be used in clinical research. A study summarizing its use in the pediatric orthopaedic population has not been previously performed. Methods: We performed a literature search of Ovid Medline, Embase, Scopus, and the Cochrane Central Register of Controlled Trials from 2010 to August 2021. There were 1961 unique citations included after the removal of 1756 duplicates. After initial screening, 183 studies were screened under full-text review leaving a final number of 51 studies included in this scoping review. Results: Pediatric PROMIS studies were grouped by body part or sub-speciality: "Hand and Upper Extremity" (25.5%, n = 13), "Sports" (23.5%, n = 12), "Spine" (13.7%, n = 7), "Trauma" (13.7%, n = 7), "General Pediatric Orthopaedics" (11.8%, n = 6), "Lower Extremity" (9.8%, n = 5), and "Orthopaedic Oncology" (2%, n = 1). An increase in studies utilizing PROMIS was seen throughout the study period with only 3 studies published from 2013 to 2016 to 39 in 2020 and 2021 alone. The 3 most frequently used pediatric PROMIS domains were Pain Interference (76.5%, n = 39/51), Mobility (60.8%, n = 31/51), and Upper Extremity (54.9%, n = 28/51). 64.3% (n = 9/14) of the included studies which reported on the floor effects of Pain Interference exhibited a significant floor effect. In all, 77.8% (n = 7/9) of the included studies which reported on ceiling effects of Upper Extremity exhibited a significant ceiling effect. Conclusion: The use of PROMIS increased significantly since the first publication in 2013 suggesting orthopaedic providers have increasingly utilized PROMIS in their day-to-day practice as an outcome measure. Ceiling and floor effects were prominent in several of the included domains (Pain Interference and Upper Extremity). Overall, PROMIS measures are efficient, reliable, and effective to use. Level of Evidence: IV.