The present invention provides an apparatus (1) for attaching a prosthetic limb to the bone of a patient, the apparatus comprising a proximal component (2) to mount to a bone implant, a distal component (3) to mount to a prosthetic limb, and a coupling body (4, 5) coupling together the proximal and distal components (2,3) with freedom to articulate when, in use, a bending and/or torsional force is applied to the prosthetic limb, only when the force exceeds a threshold level, whereby the force may be accommodated by articulation within the attachment apparatus (1). The attachment apparatus (1) thus functions as a fail-safe articulation mechanism protecting the bone of the patient.
