Anatomic femoral prosthesis for total hip arthroplasty

Abstract

An anatomic, neck-locking femoral prosthesis for use in total hip replacement is described. The asymmetric device fundamentally comprises a shell with a hollow bell-shape, which is anchored on the outside of retention neck and the trochantic bed of the femur. The prosthesis is mechanically fastened during the operation and further biologically secured by in-growing bone around the neck and trochantic bed area through the side holes on the shell and by growing into its interior porous coating surface of implant thereafter. The loading force on the femoral head would be well distributed on the shell and directly conducted into the cortex bone of the femoral shaft through the shell. The prosthesis would provide a simple and safe replacement method of hip prosthesis for most patients, particularly benefit for younger patient who has a defective head of femur. Because of less changes in term of anatomic structure of femur, new device could eliminate most of side effects and complications, which appear in regular stem type prosthesis of THA and thereafter.