An embodiment of this invention provides an ultrasound device that assesses a bone of a subject in at least two modes comprising a first mode and a second mode. The ultrasound device comprises: a selecting unit configured to select a mode from the at least two modes； a first ultrasound probe configured to transmit an ultrasound signal to the bone； a second ultrasound probe configured to receive the ultrasound signal from the bone； an assessing unit configured to derive a first parameter of the bone based on the selected mode and the ultrasound signal received by the second ultrasound probe； and a coupler being configured to be switched to a first configuration in the first mode and to a second configuration in the second mode. The ultrasound probes are oriented in substantially a same direction in the first configuration, and in substantially an opposite direction in the second configuration.
