RUS can be split into multiple subtypes, which why it is important to recognize the diverse experiences that people with RUS have:
While some people with RUS are born with the condition (CRUS), others develop the condition following physical trauma. CRUS can be diagnosed shortly after birth, but RUS from physical trauma can happen after a forearm fracture or other injuries.
RUS can be bilateral or unilateral: while some people will have RUS in both arms, others have it in only one. Those with unilateral RUS will likely require less adaptations in daily life. It is also important to recognize that everyone with RUS will have different levels of mobility depending on the severity of bone fusion.
(Example of unilateral RUS, image source orthopaedicprinciples.com)
Everyone with RUS will have slightly different extents of bone fusion, but some will lack structures in the elbow required for bone rotation, ruling out options for treatment.Â