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Bipolar Hip Prosthesis (3M)

Health Sciences · Robert W. Jackson Arthroscopy

A metal artificial hip consisting primarily of a ball attached to a tapered “femoral” stem. The two elements are joined by a ball joint located within the ball. This creates a “bipolar” arrangement in which an inner ball head is nested inside a larger femoral ball head, both of which are able to move. There is a plastic liner within the ball that holds the smaller ball element at the tip of the stem. The outside surface of the ball has a high polish while the stem has a duller finish. The stem has two larger voids (called “fenestrations”) along its length. It also has a smaller hole near the base of the collar to facilitate removal.

Accession Number: 2023.JAC.278

Alternative Name:

Primary Materials:

Unidentified Metal Alloy, Unidentified Plastic


Engraved faintly along the lower perimeter of the ball exterior: : “3M// A12442// 10608”

Engraved faintly around the lower portion of the collar: “3M// XL ZH// AF 06”

Dimensions (cm):

Height = 20.5, Width = 5.5, Length = 5.5.


A hip prosthesis is a common treatment for elderly patients when the femoral neck is fractured and displaced. Femoral neck fractures (often called “hip fractures”) are a very common injury among elderly people.

The ball of the prosthesis approximates the shape of the femoral head. The fenestrations in the stem allow for bone ingrowth (“osseointegration”).

The double ball joint (“bipolar”) hip prosthesis offers a better range of motion and less overall wear than the unipolar prosthesis.


This item is in good condition and appears to be complete. There are light abrasions across the surface of the ball and stem. There are several heavy scratches and abrasions, possibly from the removal process.

Associated Instruments:

Manufacturer: 3M Health Care Limited.

Date of Manufacture: Late 20th c.


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:

Historical Notes:

  • Donated to UTSIC