Devices that cooperate with ultrasound probes for muscoskeletal evaluations and related systems and methods

Adaptors for ultrasound probes can have an adaptor body can have an open lower end that allows a distal end of the ultrasound probe to extend therethrough to contact skin of a patient. The adaptor can include a plurality of spaced apart resilient members held by the adaptor body that, in operation, are able to change in length such that the resilient members translate from a first longer length to a second shorter length when the probe applies compressive force to the target tissue