Joint prosthesis

Joint prosthesis configured to reciprocally rotate a first prosthesis and a second prosthesis and comprising:

• a first attachment of said joint prosthesis to said first prosthesis;
• a second attachment of said joint prosthesis to said second prosthesis;
• a hinge defining an axis of rotation between said attachments and thus between said prostheses;
• a mover configured to apply to said hinge a driving torque defining a reciprocal rotation between said attachments and thus between said prostheses about said axis of rotation;
• characterised by comprising
• a compensator configured to apply a locking torque to said hinge defining the minimum torque to be applied to said hinge to determine said reciprocal rotation between said connections;
• by that
• said locking torque is variable depending on the angular opening between said connections;
• and the fact that said compensator comprises
• a cable having a first end integral with said first attachment and a second end integral with said second attachment,
• a pulley of said cable constrained in a compliant way to said second attachment so as to slide defining a sliding axis substantially radial to said axis of rotation;
• elastic means working against a sliding of said pulley and said slider along said sliding axis.