Nuclear Scintigraphy shows changes in the metabolic activity of soft tissue and bone. It uses a radioactive marker that is injected intravenously into the horse and images are obtained using a gamma camera. Areas of increased metabolic activity appear as hot spots on the images. Nuclear scintigraphy, also referred to as a bone scan, is able to detect problem areas that may not be apparent on radiographs or ultrasound. It can assist in diagnosis of horses with multiple lameness concerns. Bone scans do not replace other diagnostic tools, rather it provides additional information to facilitate a diagnosis.