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The Leeds-Keio© Ligament System 90 (Neoligaments)

Health Sciences · Robert W. Jackson Arthroscopy

A grey plastic tray with a brown-tinted clear cover features moulded recesses that contain 19 individual metal instruments. The tray consists of two parts, an outer liner and an inner insert that holds the instruments.  Three items are loose within the inner tray and two recesses are empty.

Accession Number: 2022.JAC.256

Alternative Name:

Primary Materials: Stainless Steel, Plastic


White printing on the lid of the clear case reads: “Neoligaments ltd. // The Leeds-Keio©// Ligament System 90”

Dimensions (cm):

Height = 8.5, Width = 44, Length= 35.5.


The Leeds-Keio artificial ligament was introduced in the early 1980s as a mechanically stable graft that encouraged ingrowth of tissue. It consisted of a polyester mesh that was attached to the femur and tibia with bone plugs.

This apparatus is presumably a set of guides, clamps, and similar tools meant to facilitate the implantation of the Leeds-Keio artificial ligament.


The plastic case has very light signs of wear across its surface. There is some rust on at least two of the metal components and on parts of the inner liner.

Associated Instruments:

Manufacturer: Neoligaments Ltd. Leeds, UK.

Date of Manufacture: post 1982.


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:

Kyosuke Fujikawa, Fujio Iseki, Bahaa B. Seedhom (1989). “Arthroscopy after anterior cruciate reconstruction with the Leeds-Keio ligament.” Journal of Bone and Joint Surgery. British Volume, 71(4), 566–570.

Jan Rading and Lars Peterson (1995) “Clinical experience with the Leeds-Keio artificial ligament in anterior cruciate ligament reconstruction. A prospective two-year follow-up study.” The American Journal of Sports Medicine, 1995. 23(3), 16-9.

Randy Mascarenhas and Peter B. MacDonald (2008) “Anterior Cruciate Ligament Reconstruction: A Look at Prosthetics – Past, Present and Possible Future.” McGill Journal of Medicine 11, 1: 29–37.

Historical Notes:

Neoligaments Ltd. was founded in 1982 in Leeds, UK.

Tearing of the anterior cruciate ligament (ACL) is an extremely common injury, especially among athletes.
By the last quarter of the 20th century, numerous techniques had been introduced to either replace the torn ACL with an artificial ligament, to install an artificial scaffold meant to facilitate the ingrowth of natural tissue, or to graft ligament tissue harvested from elsewhere in the body. (A brief history is provided in Mascarenhas and MacDonald, 2008)

The Leeds-Keio polyester ligament, developed through a collaboration between researchers at the Department of Orthopaedic Surgery the Keio University School of Medicine in Tokyo, Japan, and the Rheumatology and Rehabilitation Research Unit at the University of Leeds, was introduced as a mechanically stable graft that encouraged ingrowth of tissue. It consisted of a polyester mesh that was attached to the femur and tibia with bone plugs.

The first Leeds-Keio artificial ligaments were implanted in 1982, with about 350 implants by 1989. Initial follow-up studies were positive (see Fujikawa, Iseki, and Seedhom, 1989). However, by the mid-1990s, evidence had accumulated that the grafts were unstable over the long term, especially when compared to the autogenous patellar tendon graft. The technology was subsequently abandoned. (Mascarenhas and MacDonald, 2008, 32)  

  • Donated to UTSIC