A vertebral body replacement device (10; 1000) comprising: a body member (30; 1100) comprising a tool port (39; 1130) defined in an outer wall (32; 1102) of the body member (30; 1100), a first end receptacle (33; 1133) extending in a first direction, and a second end receptacle (34; 1134) extending in a second direction opposite to the first direction; a central rod member (40; 1200) having a first threaded portion (41; 1210), a second threaded portion (42; 1220), and a gear wheel portion (43; 1230), the central rod member (40; 1200) extending within the body member (30; 1100), and the gear wheel portion (43; 1230) having a toothed surface (44; 1232) and a support surface (45; 1234); a first end member (20; 1300) and a second end member (20; 1400) the first end member (20; 1300) having a first end face comprising an aperture defined therein and configured to slidably receive the first end receptacle (33; 1133) therein and a threaded hole which engages the first threaded portion (41; 1210) of the central rod member (40; 1200), and the second end member (20; 1400) having a first end face comprising an aperture defined therein and configured to slidably receive the second end receptacle (34; 1134) therein and a threaded hole which engages the second threaded portion (42; 1220) of the central rod member (40; 1200), wherein the first end member (20; 1300) bounds the first end receptacle (33; 1133) internally and externally in a radial direction relative to a longitudinal axis (72; 1201) of the body member (30; 1100), and the second end member (20; 1400) bounds the second end receptacle (34; 1134) internally and externally in a radial direction relative to the longitudinal axis (72; 1201) of the body member (30; 1100); and the body member (30; 1100), first end member (20; 1300) and second end member (20; 1400) inhibit rotational movement of the first and second end members (20; 1300, 1400) relative to the body member (30; 1100) when the vertebral body replacement device (10; 1000) is disposed within a space within a spinal column with the first and second end members (20; 1300, 1400) engaging respective vertebral bodies of the spinal column and the central rod member (40; 1200) is rotationally actuated to move the first end member (20; 1300) and the second end member (20; 1400) in an axial direction relative to the body member (30; 1100) allowing for the first end member (20; 1300) and the second end member (20; 1400) to apply a force to the two vertebral bodies to maintain a desired space therebetween, further comprising a support ring (50; 1050) having a bearing surface contacting the support surface of the gear wheel portion (43; 1230) of the central rod member (40; 1200) when the central rod member (40; 1200) is operatively positioned within the body member (30; 1100), characterized in that the support ring is C-shaped. a body member (30; 1100) comprising a tool port (39; 1130) defined in an outer wall (32; 1102) of the body member (30; 1100), a first end receptacle (33; 1133) extending in a first direction, and a second end receptacle (34; 1134) extending in a second direction opposite to the first direction; a central rod member (40; 1200) having a first threaded portion (41; 1210), a second threaded portion (42; 1220), and a gear wheel portion (43; 1230), the central rod member (40; 1200) extending within the body member (30; 1100), and the gear wheel portion (43; 1230) having a toothed surface (44; 1232) and a support surface (45; 1234); a first end member (20; 1300) and a second end member (20; 1400) the first end member (20; 1300) having a first end face comprising an aperture defined therein and configured to slidably receive the first end receptacle (33; 1133) therein and a threaded hole which engages the first threaded portion (41; 1210) of the central rod member (40; 1200), and the second end member (20; 1400) having a first end face comprising an aperture defined therein and configured to slidably receive the second end receptacle (34; 1134) therein and a threaded hole which engages the second threaded portion (42; 1220) of the central rod member (40; 1200), wherein the first end member (20; 1300) bounds the first end receptacle (33; 1133) internally and externally in a radial direction relative to a longitudinal axis (72; 1201) of the body member (30; 1100), and the second end member (20; 1400) bounds the second end receptacle (34; 1134) internally and externally in a radial direction relative to the longitudinal axis (72; 1201) of the body member (30; 1100); and the body member (30; 1100), first end member (20; 1300) and second end member (20; 1400) inhibit rotational movement of the first and second end members (20; 1300, 1400) relative to the body member (30; 1100) when the vertebral body replacement device (10; 1000) is disposed within a space within a spinal column with the first and second end members (20; 1300, 1400) engaging respective vertebral bodies of the spinal column and the central rod member (40; 1200) is rotationally actuated to move the first end member (20; 1300) and the second end member (20; 1400) in an axial direction relative to the body member (30; 1100) allowing for the first end member (20; 1300) and the second end member (20; 1400) to apply a force to the two vertebral bodies to maintain a desired space therebetween, further comprising a support ring (50; 1050) having a bearing surface contacting the support surface of the gear wheel portion (43; 1230) of the central rod member (40; 1200) when the central rod member (40; 1200) is operatively positioned within the body member (30; 1100), characterized in that the support ring is C-shaped.