3D-printed anatomical finger model offers procedural guidance of trigger finger injections Treatment of an injured or diseased joint may require precise insertion of a syringe needle -- musculoskeletal sonography can help guide clinicians as they drain fluid from arthritic knees or inject corticosteroids into trigger fingers. However, there is a need for training simulators that allow practice on an inert model, before attempting treatment on a patient. For ultrasound, such simulation trainers are called phantoms. Researchers at the University of Alabama at Birmingham and University of South Carolina have now made a 3D-printed anatomical finger model, embedded in ballistic gelatin, as a low-cost ultrasound training phantom for procedural guidance of trigger finger injections.