Queen's University at Kingston

Theodore D Cooke

Gerald A Saunders

David Siu

Yuki Yoshioka

Urs Wyss

J Timothy Bryant

David W Siu

An endoprosthetic metatarsal-phalangeal replacement joint is described. The joint includes a distal metatarsal component having a part-spherical convex distal superior phalangeal articular surface, and two inferior 'side-by-side' sesamoidal articular surfaces, separated by an intersesamoidal ridge. The proximal phalangeal component is provided with a proximal circular surface at least a major portion of which has a part spherical concave surface having similar radius of curvature as the distal superior phalangeal surface of the metatarsal component. Natural, natural-resurfaced or prosthetic sesamoids are secured to a flexible mesh element arranged to be secured between the phalangeal component and the phalanx so that the sesamoids are positioned for articulation with the two inferior sesamoidal surfaces of the distal metatarsal component.

Metatarsal-phalangeal replacement joint

The apparatus enables the taking of multiple X-ray photographs of the legs and pelvis of a patient. A platform is rotatably mounted on a base member, and is provided with means for keeping the patient still in a standardized standing position. With only minor vertical and horizontal adjustment of an associated substantially point source of X-rays, side and front X-rays can be taken without movement of the patient, apart from rotation of the platform. Radio opaque marker means provided on otherwise radio-transparent spaced screens produce, on the X-ray film, images which can be interpreted to provide information for compensation of distortions in images on the X-ray film due to the use of a point source of radiation.

X-ray apparatus with source distortion compensation

An orthopaedic bone cutting jig and alignment frame for facilitating a series of controlled, precise bone cuts to fit selected prosthetic knees which promote bone imgrowth and do not rely upon cement for fixation.

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Kingston, Canada

Theodore D Cooke