Total Joint Arthroplasty in a Pediatric Population

Inclusion Criteria: Populations 1,2,3 * Age between 10 years and 25 years * Undergoing or have undergone total joint arthroplasty at Children's Hospital Colorado for non-solid tumor related reasons * Treated at Children's Hospital Colorado by Dr. Nathan Donaldson, DO or Dr. Steven Thorpe, MD or previously by Travis Heare, MD Exclusion Criteria: Populations 1,2,3 * Subjects and/or parents not capable of completing basic questionnaires in English (HRQL data will not be collected from non-English speaking subjects because we do not have access to versions of these questionnaires that have been validated in languages other than English. These patients may be included at a later date when validated questionnaires are available). * Subjects who underwent hemiarthroplasties, failed rotationplasty to arthroplasty conversions, or joint arthroplasty directly related to a tumor at the location of the joint * Subjects diagnosed with mucopolysaccharidoses (MPS), pseudorheumatoid chondrodysplasia, or diastrophic dwarfism Inclusion Criteria: Population 4 * Age between 10 years and 25 years * Treated at Children's Hospital Colorado by Dr. Nathan Donaldson, DO, or Dr. Steven Thorpe, MD or previously by Travis Heare, MD * Symptomatic joint pain treated non-invasively via lifestyle modifications, over the counter or prescription pain medication, nerve blocks or steroid injections, and/or physical therapy * Symptomatic joint pain treated via core decompression surgery at Children's Hospital Colorado by Dr. Nathan Donaldson, DO, or Dr. Steven Thorpe, MD, or previously by Travis Heare, MD Exclusion Criteria: Population 4 * Patients who underwent a joint arthroplasty directly related to a tumor at the location of the joint at Children's Hospital Colorado. Patients undergoing or have undergone total joint arthroplasty at Children's Hospital Colorado for non-solid tumor related reasons * Subjects diagnosed with mucopolysaccharidoses (MPS), pseudorheumatoid chondrodysplasia, or diastrophic dwarfism