Percutaneous osseointegrated implant assembly for use in supporting an exo-prosthesis

A method of securing an exo-prosthesis to a selected bone of a limb of an individual in need thereof, comprising:

• preparing a medullary cavity of a selected long bone for receipt of at least a portion of an implant assembly;
• inserting at least a proximal end of a stem of the implant assembly within the prepared medullary cavity of the selected bone, a distal end of the stem comprising a substantially flat collar having a substantially flat surface that extends perpendicular to a longitudinal axis of the selected long bone and that engages the selected long bone perpendicular to the longitudinal axis of the selected long bone, thereby forming a direct seal with the selected long bone;
• attaching a proximal portion of a subdermal component to the distal end of the stem, the subdermal component comprising:
• a low energy surface configured to inhibit bio-adhesion disposed on the proximal portion of the subdermal component;
• and
• a distal portion comprising a fixation surface having a porous structure configured to promote soft tissue fixation;
• and
• attaching a proximal end of a percutaneous post to the subdermal component.