A bone implant that is a shape changing bone fixation implant comprising: (a) a biocompatible material structure that comprises a shape changing cage, wherein the biocompatible material structure is in a first shape, wherein the first shape allows the biocompatible material structure to be positioned proximate to a first bone segment and a second bone segment without the biocompatible material structure applying mechanical forces (i) to pull together the first bone segment and the second bone segment , and (ii) to compress the first bone segment and the second bone segment at a bone healing interface ; and characterized in that the bone implant further comprises (b) an actuator holding the biocompatible material structure in the first shape, wherein the biocompatible material structure is operable to move toward a second shape upon actuation of the actuator to release the biocompatible material structure from being held, and further wherein (i) the movement of the released biocompatible material structure toward the second shape is operable to pull together the first segment and the second bone segment , (ii) the movement of the released biocompatible material structure toward the second shape is operable to compress the first bone segment and the second bone segment at the bone healing interface , and (iii) the movement of the released biocompatible material structure to the second shape is operable to maintain the first bone segment and the second bone segment at the bone healing interface while the first bone segment and the second bone segment heal. (a) a biocompatible material structure that comprises a shape changing cage, wherein the biocompatible material structure is in a first shape, wherein the first shape allows the biocompatible material structure to be positioned proximate to a first bone segment and a second bone segment without the biocompatible material structure applying mechanical forces (i) to pull together the first bone segment and the second bone segment , and (ii) to compress the first bone segment and the second bone segment at a bone healing interface ; and characterized in that the bone implant further comprises (i) to pull together the first bone segment and the second bone segment , and (ii) to compress the first bone segment and the second bone segment at a bone healing interface ; and characterized in that the bone implant further comprises (b) an actuator holding the biocompatible material structure in the first shape, wherein the biocompatible material structure is operable to move toward a second shape upon actuation of the actuator to release the biocompatible material structure from being held, and further wherein (i) the movement of the released biocompatible material structure toward the second shape is operable to pull together the first segment and the second bone segment , (ii) the movement of the released biocompatible material structure toward the second shape is operable to compress the first bone segment and the second bone segment at the bone healing interface , and (iii) the movement of the released biocompatible material structure to the second shape is operable to maintain the first bone segment and the second bone segment at the bone healing interface while the first bone segment and the second bone segment heal. (i) the movement of the released biocompatible material structure toward the second shape is operable to pull together the first segment and the second bone segment , (ii) the movement of the released biocompatible material structure toward the second shape is operable to compress the first bone segment and the second bone segment at the bone healing interface , and (iii) the movement of the released biocompatible material structure to the second shape is operable to maintain the first bone segment and the second bone segment at the bone healing interface while the first bone segment and the second bone segment heal. <EOS>