Health Sciences · Robert W. Jackson Arthroscopy
Two components of a unicompartmental knee prosthesis that have been removed from a patient.
2025.JAC.286.1: A metal femoral component with a polished outer surface. The inner surface has two studs for cement fixation. Bone cement covers much of the inner surface. The edges are heavily scratched and marked.
2025.JAC.286.2: A metal tibial platform with three studs, two circular in cross section, the other has a triangular profile. A white polyethylene liner is cemented into the surface. Bone cement covers much of the inner surface.
These two components were stored in a sterilization pouch. This was discarded because it included identifying information.
Accession Number: 2025.JAC.286.1-2
Alternative Name:
2025.JAC.286.1: Cobalt-Chromium Alloy; 2025.JAC.286.2: Titanium Alloy, High-Density Polyethylene
2025.JAC.286.1 (Femoral component):
Etched along one side: “60161691// [Zimmer logo] 5790-27 C// Reg+ R.MED L.LAT”
2025.JAC.286.2 (Tibial component):
Etched along flat side: “[Zimmer logo] 5790-45-11// 0010093 T”
Etched along curved side: “RT MED LT LAT SERIES 1”
2025.JAC.286.1: Height = 2.4, Width = 2.5, Length = 5.5; 2025.JAC.286.2: Height = 2.2, Width = 2.5, Length = 4.
The knee replacement was introduced to address a number of knee ailments, especially severe arthritis. Partial knee replacement is used in cases in which damage is largely confined to one compartment of the knee.
2025.JAC.286.1: There are scratches along the outside, lower edges, and bottom surface, likely due to the removal process. Patches of bone cement adhere to the bottom surface. There are several shallow gouges and light wear patches on the HDPE bearing surface.
2025.JAC.286.2: There are deep scratches along the sides and lower edges, lower edges,likely due to the removal process. Bone cement covers much of the inside surface. There are light wear larks on the bearing surface.
Associated Instruments:
Manufacturer: Zimmer. Warsaw, Indiana, USA.
Date of Manufacture: c. 1990s
The Robert W. Jackson Arthroscopy Collection was acquired by the University of Toronto from Dr. Jackson’s family on November 12th, 2020.
James R. Gill and Paul Nicolai (2019). Clinical results and 12-year survivorship of the Physica ZUK unicompartmental knee replacement. The Knee, 26(3), 750–758.
Arnaud Clavé and Frédéric Dubrana. (Eds.). (2024). Unicompartmental Knee Arthroplasty : A New Paradigm? (1st ed. 2024.). Springer International Publishing.
The Millet-Galante II unicompartmental prosthesis was produced by Zimmer between 1992 and 2008. Survival studies showed mixed results due to premature wear of the HDPE bearing surface (Clavé and Dubrana 2024, 22).
In 2005, the Miller-Galante II prosthesis was superseded by the Physica ZUK prosthesis of Lima Corporate, Udine, Italy. The ZUK implant was an evolution of the M/G with an extended posterior femoral condyle and a broader PETG surface (Gill and Nicolai 2019, 751)