US 2010/0076572 A1 · DEVICE AND METHOD FOR RECONSTRUCTION OF OSSEOUS SKELETAL DEFECTS

Abstract

A synovial joint implantable apparatus for the reconstruction of skeletal defects with a flexible member, which is preferably resorbable, attached to a rigid structural prosthesis such as a total hip or total knee replacement implant. The cavitary space defined and surrounded by the flexible member is filled with osteoconductive and/or inductive materials which eventually matures into new column of bone. The prosthesis is supported by the bed of graft material surrounding it and is gradually unloaded as the bed matures into solid bone. The fixation of the prosthesis into native bone depends on the specific implant and the anatomic area of its use. The flexible member is secured to the margins of the prosthesis using rails, runners, sutures, or other attachment devices that prevent the escape of the bone graft and maintain an initial column of support for the implant. Should the metal implant even need removal, the reconstituted bone can be separated from the implant in such a way as to restore bone stock and facilitate future revision surgical procedures.

Claims18

Dependent claims

A synovial joint prosthetic apparatus, comprising:

an elongate implantable portion;
an articular portion having artificial articular surfaces and at least one attachment member disposed on the outer surface of said articular portion;
a bone growth housing having a proximal aspect and a distal aspect and an aperture for passing tendons, wherein when assembled in the surgical field said distal aspect is attached to the proximal aspect of residual host bone and said proximal aspect is attached to said at least one attachment member so as to form a single and undivided cavitary space for holding bone growth material, said cavitary space modeled to substantially match the removed bone and surrounding a predetermined length of said elongate implantable portion and a predetermined length of said articular portion up to the level of said attachment members.

A method for reconstructing osseous skeletal defects, said method comprising the steps of:

(a) measuring and documenting the damaged or diseased bone;
(b) determining a resection point;
(c) designing and fabricating the prosthetic apparatus in conformity with the patient's needs and surgical objectives, the apparatus including an insertable rod for insertion into host bone;
(d) determining whether to use a customized or prefabricated bone growth housing;
(e) making said bone growth housing if step (d) is yes;
(f) cutting and removing the diseased or damaged area of the bone such that the remaining bone is able to support a new prosthetic apparatus;
(g) expanding the residual bone shaft as necessary to size and shape it for a tight, intimate contact between the femur and the insertable rod of the prosthesis;
(h) determining the desired height of the prosthesis above the remaining bone and the length of the bone restoration prosthesis;
(i) installing the insertable rod of the prosthesis into the host bone;
(j) installing the bone growth housing;
(k) passing the bone growth housing over the articular portion of the prosthesis circumferentially, thereby enclosing that portion of the prosthesis, and bringing the distal border of the bone growth housing down and over the residual bone shaft;
(l) cutting the bone growth housing at the desired level over the residual bone shaft such that it overlaps the bone;
(m) tightening the bone growth housing at its distal border over the bone shaft so as to define and partially enclose the cavity space around the prosthesis at the point of the residual bone;
(n) if applicable, passing tendons through an aperture in the bone growth housing and attaching them to the prosthesis;
(o) filling the distally enclosed cavitary space with bone graft substitutes;
(p) attaching the proximal aspect of the bone growth housing to the upper aspect of the prosthesis so as to enclose the entire cavitary space;
and
(q) reducing the joint into its socket;

15 more elements

Dependencies are inferred from the claim text.

Device and method for reconstruction of osseous skeletal defects

Life of this patent

Device and method for reconstruction of osseous skeletal defects

Life of this patent

Abstract

Claims18