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A robotic device for operation in association with an appendage of a user, wherein the appendage of the user has an endpoint, the robotic device including: a base; and a robotic arm attached to the base and having an endpoint, the robotic arm having at least two active degrees of freedom relative to

A robotic device for operation in association with an appendage of a user, wherein the appendage of the user has an endpoint, the robotic device including: a base; and a robotic arm attached to the base and having an endpoint, the robotic arm having at least two active degrees of freedom relative to the base and being configured so that when the base is appropriately positioned relative to a user, the reference frame of the robotic device is oriented generally similarly to the reference frame of the user and motions of the endpoint of the appendage of the user are mimicked by motions of the endpoint of the robotic arm.

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1. A robotic device for operation in association with a body of a user, wherein the body of the user comprises a torso and an appendage, wherein the appendage of the user has an endpoint, an appendage segment, a first joint movably connecting the endpoint to the appendage segment, and a second joint

1. A robotic device for operation in association with a body of a user, wherein the body of the user comprises a torso and an appendage, wherein the appendage of the user has an endpoint, an appendage segment, a first joint movably connecting the endpoint to the appendage segment, and a second joint movably connecting the appendage segment to the torso of the user, the robotic device comprising: a base having a fixed configuration, the base being configured for disposition behind, and to the side of, the torso of the user;a first segment movably mounted to the base so as to rotate around a first axis, whereby to provide a first degree of freedom;a second segment movably mounted to the first segment so as to rotate around a second axis, whereby to provide a second degree of freedom;a third segment mounted to the second segment; anda fourth segment movably mounted to the third segment so as to rotate around a third axis, whereby to provide a third degree of freedom, the fourth segment having an endpoint, the endpoint of the fourth segment being configured for attachment to the endpoint of the appendage of the user and the fourth segment being configured to be free of attachment to the appendage segment of the user;wherein the first axis is disposed substantially horizontal, the second axis is disposed orthogonal to the first axis, and the third axis is disposed parallel to the second axis; andwherein, when the endpoint of the fourth segment is attached to the endpoint of the appendage of the user, the first segment, the second segment, the third segment and the fourth segment move during movement of the appendage of the user, and none of the first axis, the second axis, and the third axis are disposed coaxial with either the first joint or the second joint of the appendage of the user. 2. A robotic device according to claim 1 wherein the first and second degrees of freedom of the robotic device are linked through a cabled differential. 3. A robotic device according to claim 2 wherein the cabled differential comprises an input axis and an output axis, wherein the third segment is coupled to the cabled differential, wherein the third segment extends along an axis, and wherein both the input axis and the output axis of the cabled differential are perpendicular to the axis of the third segment. 4. A robotic device according to claim 1 further comprising motors, wherein the base of the robotic device comprises a ground frame and the robotic device comprises kinematic frames at each degree of freedom, and wherein the motors are located on kinematic frames beyond the ground frame. 5. A robotic device according to claim 1 wherein the robotic device is configured to be symmetric about a plane parallel to the midsagittal plane of a user during use. 6. A robotic device according to claim 1 wherein the third and fourth segments are stacked downwards. 7. A robotic device according to claim 1 wherein the third and fourth segments are stacked upwards. 8. A robotic device according to claim 1 wherein the endpoint of the robotic device is replaceable by another endpoint providing different functionality. 9. A robotic device according to claim 1 wherein the 3 degrees of freedom are arranged in a pitch-yaw-yaw configuration, wherein the first and second segments of the robotic device are linked through a cabled differential, wherein an actuator for the fourth segment is located along the first axis, and wherein the fourth segment of the robotic device is configured to facilitate switching between right-handed use and left-handed use. 10. A robotic device according to claim 1 wherein rotation around the first axis provides pitch, and rotation around the second and third axes provides yaw. 11. A robotic device according to claim 1 wherein the second segment is attached perpendicularly to the first segment. 12. A robotic system comprising: a first robotic device for operation in association with a body of a user, wherein the body of the user comprises a torso and two appendages, wherein the first appendage of the user has a first endpoint, a first appendage segment, a first joint movably connecting the first endpoint to the first appendage segment, and a second joint movably connecting the appendage segment to the torso of the user;a second robotic device for operation in association with a second appendage of the body of the user, wherein the second appendage of the user has a second endpoint, a second appendage segment, a third joint movably connecting the second endpoint to the second appendage segment, and a fourth joint movably connecting the appendage segment to the torso of the user, the first and second robotic devices each comprising: a base having a fixed configuration, the base being configured for disposition behind, and to the side of, the torso of the user;a first segment movably mounted to the base so as to rotate around a first axis, whereby to provide a first degree of freedom;a second segment movably mounted to the first segment so as to rotate around a second axis, whereby to provide a second degree of freedom;a third segment mounted to the second segment; anda fourth segment movably mounted to the third segment so as to rotate around a third axis, whereby to provide a third degree of freedom, the fourth segment having an endpoint;wherein the endpoint of the fourth segment of the first robotic device is configured for attachment to the first endpoint of the first appendage of the user and the fourth segment of the first robotic device is configured to be free of attachment to the first appendage segment of the user;wherein the second endpoint of the fourth segment of the second robotic device is configured for attachment to the second endpoint of the second appendage of the user and the fourth segment of the second robotic device is configured to be free of attachment to the second appendage segment of the user; andwherein the first robotic device and the second robotic device are paired so that the first robotic device and the second robotic device move in conjunction with one another;wherein the first axis of the first robotic device and the first axis of the second robotic device are disposed substantially horizontal, the second axis of the first robotic device and the second axis of the second robotic device are disposed orthogonal to the first axis of the first robotic device and the first axis of the second robotic device, respectively, and the third axis of the first robotic device and the third axis of the second robotic device are disposed parallel to the second axis of the first robotic device and the second axis of the second robotic device, respectively; andwherein, when the endpoint of the fourth segment of the first robotic device is attached to the first endpoint of the appendage of the user, and when the endpoint of the fourth segment of the second robotic device is attached to the second endpoint of the second appendage of the user, the first segment, the second segment, the third segment and the fourth segment of both the first robotic device and the second robotic device move during movement of the first and second appendages of the user, respectively, and none of the first axis, the second axis, and the third axis of either the first robotic device or the second robotic device are disposed coaxial with either the first joint or the second joint of either the first or second appendages of the user. 13. A method comprising: providing a robotic system comprising: a first robotic device for operation in association with a first appendage of a body of a user, wherein the body of the user comprises a torso and two appendages, wherein the first appendage of the user has a first endpoint, a first appendage segment, a first joint movably connecting the first endpoint to the first appendage segment, and a second joint movably connecting the appendage segment to the torso of the user;a second robotic device for operation in association with a second appendage of the body of the user, wherein the second appendage of the user has a second endpoint, a second appendage segment, a third joint movably connecting the second endpoint to the second appendage segment, and a fourth joint movably connecting the appendage segment to the torso of the user, the first and second robotic devices each comprising: a base having a fixed configuration, the base being configured for disposition behind, and to the side of, the torso of the user;a first segment movably mounted to the base so as to rotate around a first axis, whereby to provide a first degree of freedom;a second segment movably mounted to the first segment so as to rotate around a second axis, whereby to provide a second degree of freedom;a third segment mounted to the second segment; anda fourth segment movably mounted to the third segment so as to rotate around a third axis, whereby to provide a third degree of freedom, the fourth segment having an endpoint;wherein the endpoint of the fourth segment of the first robotic device is configured for attachment to the first endpoint of the first appendage of the user and the fourth segment of the first robotic device is configured to be free of attachment to the first appendage segment of the user;wherein the second endpoint of the fourth segment of the second robotic device is configured for attachment to the second endpoint of the second appendage of the user and the fourth segment of the second robotic device is configured to be free of attachment to the second appendage segment of the user; andwherein the first robotic device and the second robotic device are paired so that the first robotic device and the second robotic device move in conjunction with one another;wherein the first axis of the first robotic device and the first axis of the second robotic device are disposed substantially horizontal, the second axis of the first robotic device and the second axis of the second robotic device are disposed orthogonal to the first axis of the first robotic device and the first axis of the second robotic device, respectively, and the third axis of the first robotic device and the third axis of the second robotic device are disposed parallel to the second axis of the first robotic device and the second axis of the second robotic device, respectively; andwherein, when the endpoint of the fourth segment of the first robotic device is attached to the first endpoint of the appendage of the user, and when the endpoint of the fourth segment of the second robotic device is attached to the second endpoint of the second appendage of the user, the first segment, the second segment, the third segment and the fourth segment of both the first robotic device and the second robotic device move during movement of the first and second appendages of the user, respectively, and none of the first axis, the second axis, and the third axis of either the first robotic device or the second robotic device are disposed coaxial with either the first joint or the second joint of either the first or second appendages of the user;positioning the base behind, and to the side of, the torso of the user;connecting a first appendage of a user to the endpoint of the fourth segment of the first robotic device and connecting a second appendage of a user to the endpoint of the fourth segment of the second robotic device; andwhen a user moves the first appendage, causing the second robotic device to move the second appendage of the user. 14. A method for operating a robotic device in association a body of a user, wherein the body of the user comprises a torso and an appendage, wherein the appendage of the user has an endpoint, an appendage segment, a first joint movably connecting the endpoint to the appendage segment, and a second joint movably connecting the appendage segment to the torso of the user, the method comprising: providing a robotic device comprising: a base having a fixed configuration, the base being configured for disposition behind, and to the side of, the torso of the user;a first segment movably mounted to the base so as to rotate around a first axis, whereby to provide a first degree of freedom;a second segment movably mounted to the first segment so as to rotate around a second axis, whereby to provide a second degree of freedom;a third segment mounted to the second segment; anda fourth segment movably mounted to the third segment so as to rotate around a third axis, whereby to provide a third degree of freedom, the fourth segment having an endpoint, the endpoint of the fourth segment being configured for attachment to the endpoint of the appendage of the user and the fourth segment being configured to be free of attachment to the appendage segment of the user;wherein the first axis is disposed substantially horizontal, the second axis is disposed orthogonal to the first axis, and the third axis is disposed parallel to the second axis; andwherein, when the endpoint of the fourth segment is attached to the endpoint of the appendage of the user, the first segment, the second segment, the third segment and the fourth segment move during movement of the appendage of the user, and none of the first axis, the second axis, and the third axis are disposed coaxial with either the first joint or the second joint of the appendage of the user;positioning the base behind, and to the side of, the torso of the user so that the reference frame of the robotic device is oriented similarly to the reference frame of the user, and attaching the endpoint of the appendage of the user to the endpoint of the fourth segment of the robotic device and leaving the appendage segment of the user free of attachment to the fourth segment of the robotic device; andmoving at least one of the endpoint of the appendage of the user and the endpoint of the fourth segment of the robotic device. 15. A robotic device for operation in association with a user, wherein the user has a torso and a limb, and further wherein the limb comprises a plurality of segments connected together by joints, the robotic device comprising: a base; anda robotic arm comprising a first end connected to the base and a second end terminating in an endpoint, wherein the base is configured for disposition behind, and to the side of, the torso of the user, and further wherein the endpoint is configured for attachment to a segment of the limb of the user;wherein the robotic arm comprises a plurality of segments connected together by powered joints;wherein, when the endpoint of the robotic arm is attached to a segment of the limb of a user, the powered joints move during movement of the limb of the user, and none of the powered joints is disposed coaxial with the joints of the limb of the user; andwherein the robotic arm comprises no more than four powered joints. 16. A method for operating a robotic device in association with a body of a user, wherein the body of the user comprises a torso and a limb, and further wherein the limb comprises a plurality of segments connected together by joints, the method comprising: providing a robotic device comprising: a base; anda robotic arm comprising a first end connected to the base and a second end terminating in an endpoint, wherein the base is configured for disposition behind, and to the side of, the torso of the user, and further wherein the endpoint is configured for attachment to a segment of the limb of the user;wherein the robotic arm comprises a plurality of segments connected together by powered joints;wherein, when the endpoint of the robotic arm is attached to a segment of the limb of a user, the powered joints move during movement of the limb of the user, and none of the powered joints is disposed coaxial with the joints of the limb of the user; andwherein the robotic arm comprises no more than four powered joints;positioning the base behind, and to the side of, the torso of the user so that the reference frame of the robotic device is oriented similarly to the reference frame of the user, and attaching a segment of the limb of the user to the endpoint of the robotic arm; andmoving at least one of the limb of the user and the endpoint of the robotic arm.