The phrase "elbow scores" refers to a system used to measure the health of a dog's elbows. It helps determine if a dog has any joint problems or conditions that could make them uncomfortable or have trouble moving. Full definition
The breeding value is an indicator for the genetic basis of the hip and elbow score variation. (www2.vet.cornell.edu)
They should also have good hip scores, perfect elbow scores, and DNA tests for PRA blindness as a minimum. (thehappypuppysite.com)
If you intend to breed make sure you buy from hip scored and preferably elbow scored parents and that you buy a correctly marked puppy. (rhodesianridgebacks.org)