A medical device and tension member for use in a subject enables fixation of tension members and transmission of force from tissues to energy converters or to natural or prosthetic bones or other prostheses. The medical device includes an anchor block having a knob extending from its surface, such knob configured to engage a looped tension member. The tension member includes a looped portion configured to engage the knob, an intermediate portion, and a tissue engaging portion configured to engage tissue in a subject. The looped portion is connected to the tissue engaging portion via the intermediate portion. A system is provided for use in a subject and includes at least one looped tension member, an operational device, and at least one medical device configured to couple the looped tension member and the operational device.
