Orthopaedic implants

Inactive Publication Date: 2011-01-06
MCGILL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The present invention reduces the difficulties an

Problems solved by technology

Damaged or diseased bones and joints in human and animal patients give rise to pain and decreased joint mobility.
The replacement of bones in the wrist has had limited success because of the complexity and multitude of bones, tendons and ligaments in the wrist.
Arthritis more commonly affects elderly patients and results in painful joints, and may be so severe that the pain cannot be managed with pain medication and the arthritic hand cannot be used to lift weight.
Damage or degeneration to the scaphoid bone can also occur through conditions other than fracture.
The scaphoid bone is particularly difficult to heal since

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0103]The scaphoid implant 10 of the present invention was made and implanted in the manner as described above into the wrist of a cadaver, including use of the cutting guide jigs. FIGS. 26A and 26B, 27A and 27B, and 28A and 28B show x-rays taken of the cadaver's wrist after implantation and during maximum flexion and extension.

example 2

[0104]The inventors performed a cadaveric study using MRI and CT on the symmetry of contralateral scaphoid bones. Surprisingly, they found that the contralateral scaphoid bones are mirror images of one another, as determined by four geometrical features: 1) long axis, 2) waist length, 3) distal pole and 4) proximal pole (FIG. 29A).

[0105]A CT and MR investigation of 12 pairs of cadaveric wrists was made in neutral position. After imaging, each wrist was dissected and the bones were cleaned of any connective tissue. The bones were measured along their longest axis and the volume of each bone was determined by water displacement measurements.

Lunate Measurements

[0106]Antero-dorsal diameter (16.96 mm±1.6)[0107]Medio-lateral diameter (12.8 mm±1.37)[0108]Height / max length[0109]Volume[0110]Surface Area.

Scaphoid Measurements

[0111]Height / Max length[0112]Volume[0113]Surface Area.

[0114]A statistical analysis was carried using the Pearson correlation coefficient comparing CT / MRI and anatomical m...

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Abstract

A method for making an orthopaedic implant, the method comprising: characterizing at least a portion of a bone corresponding to the bone to be replaced, said corresponding bone being on the contralateral side of the patient; providing a model of the orthopaedic implant based on a mirror image of the contralateral bone; and forming the orthopaedic implant based on the model.

Description

FIELD OF THE INVENTION[0001]The invention relates generally to orthopaedic implants, methods of making the orthopaedic implants, methods of implanting the orthopaedic implants, devices for implanting the orthopaedic implants and devices for assisting cutting bone.BACKGROUND OF THE INVENTION[0002]Damaged or diseased bones and joints in human and animal patients give rise to pain and decreased joint mobility. It is known to totally or partially replace these bones and joints with artificial implants to alleviate the painful symptoms and restore some degree of mobility.[0003]The replacement of bones in the wrist has had limited success because of the complexity and multitude of bones, tendons and ligaments in the wrist. As can be seen in FIG. 1, there is a first row of wrist bones, known as a first carpal row or proximal carpal row, adjacent a radius bone and an ulnar bone. The proximal carpal row includes a scaphoid bone, a lunate bone, a triquetrum bone and a pisiform bone. A second ...

Claims

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Application Information

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IPC IPC(8): A61F2/42A61B5/05A61B17/16
CPCA61B6/505Y10T29/49A61B2019/502A61F2/28A61F2/30942A61F2/4261A61F2002/2871A61F2002/30069A61F2002/30945A61F2002/30948A61F2002/30957A61F2002/4289A61F2240/004A61F2310/00011A61F2310/00179A61B17/15A61B2034/102A61F2002/30943B33Y50/00B33Y80/00
Inventor HACKING, ADAM S.HARVEY, EDWARD J.RICHARDS, COREY
Owner MCGILL UNIV
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