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Total Knee Prosthesis (Guépar)

Health Sciences · Robert W. Jackson Arthroscopy

A metal artifact consisting of two tapered stems joined by a central hinged element. The two sides of the metal hinge are cushioned by a small, square silicone pad or bumper.

The stems have a matte texture whereas the hinge has a glossy finish. One of the stems is tilted slightly relative to the other. The stems have a matte texture whereas the hinge has a glossy finish.

Accession Number: 2023.JAC.272

Alternative Name: Hinged Knee Replacement

Primary Materials:

Chrome-Cobalt-Molybdenum Alloy, Silicone (“Silastic”)


Stamped onto one face of each stem, towards the tapered tip: “FRANCOBAL S”
Stamped near the hinge on both parts of the artifact: “H8431A”

Dimensions (cm): Height= 28.5; Width = 4.5; length – 5.


The total knee replacement was introduced to address a number of knee ailments, especially severe arthritis.

This fixed-hinge design represents an early effort to develop a suitable knee replacement.


This artifact is in good cosmetic condition, There are very light scratches and scuffs across its surface. There is a long vertical scratch on one face of one of the stems.

Associated Instruments:

Manufacturer: Benoist Girard & Co.

Date of Manufacture: c. 1970s – 1980s.


The Robert W. Jackson Arthroscopy Collection was acquired by the University of Toronto from Dr. Jackson’s family on November 12th, 2020.

Additional Information and References:

Francois B. Mazas et al. “Guepar Total Knee Prosthesis.” Clinical Orthopaedics and Related Research, no. 94 (1973): 211–21.

J. LeNobel and F.P. Patterson. “Guepar Total Knee Prosthesis. Experience at the Vancouver General Hospital.” Journal of Bone and Joint Surgery. British Volume 63, no. 2 (1981): 257–60.

J.-H. Aubriot, A. Deburge, J.-P. Genet, “GUEPAR hinge knee prosthesis.” Orthopaedics & Traumatology: Surgery & Research, Volume 100, Issue 1, (2014): 27-32.

Alan J. Hawk. “ArtiFacts: The GUEPAR Offset Hinge Knee.” Clinical Orthopaedics and Related Research 476(4):p 692-693, April 2018.

Historical Notes:

The Guépar Total Knee Prosthesis was tested in the early 1970s and introduced by the Guépar group (Groupe pour l’utilisation et l’étude des prothèses articulaires ) based at Hôpital Cochin in Paris, France.

Follow-up studies (leNobel and Patterson 1981) revealed a number of problems, including the breakdown of the silicone bumper, which caused an inflammatory response, as well as a patellar subluxation attributed the angled (“valgus”) hinge.

The prosthesis was modified substantially over subsequent years to address these problems, though orthopedic surgery moved away from highly constrained fixed-hinged designs for knee prosthetics. (See especially Hawk 2018).

  • Donated to UTSIC