Adjustable bone prostheses and related methods

An assembly comprising

• a prosthesis,
• a pivot pin including a first contact surface,
• a mount including a mounting surface for the prosthesis, the mount including a first pivot surface overlying and mating with the first contact surface for movement of the mount upon the pivot pin relative to a z-axis, the mounting surface being eccentric relative to the z-axis, the mount including a plurality of spaced-apart pivot surfaces stacked sequentially above the first contact surface, the plurality of spaced-apart pivot surfaces moving in concert with the mount upon the pivot pin,
• a first washer coupled to the pivot pin between two adjacent ones of the plurality of spaced-apart pivot surfaces, the first washer including opposed second and third contact surfaces sandwiched between and mating with adjacent ones of the pivot surfaces during movement of the mount upon the pivot pin,
• a second washer coupled to the pivot pin above the first washer, the second washer including a fourth contact surface overlying and mating with another one of the plurality of spaced-apart pivot surfaces during movement of the mount upon the pivot pin, and
• a locking pin extending through the mount, the first and second washers, and the plurality of spaced-apart pivot surfaces, and threaded to the pivot pin for rotational movement in a first direction for compressing the first, second, third, and fourth contact surfaces against the respective ones of the pivot surfaces to create multiple concurrent frictional forces at all first, second, third and fourth contact surfaces that limit movement of the mount upon the pivot pin for fixing a position of the prosthesis, and in a second direction that relieves the multiple concurrent frictional forces to allow movement of the mount upon the pivot pin for adjusting a position of the prosthesis.