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An experimental evaluation of isometric placement for extraarticular reconstructions of the anterior cruciate ligament

Research Institute of Applied Electricity

Kazunori Yasuda, MD

Department of Orthopedic Surgery, School of Medicine, Hokkaido University, Sapporo, Japan

Ken-Ichi Yamakoshi, PhD

Research Institute of Applied Electricity

Akira Kamiya, MD

Research Institute of Applied Electricity

Kiyoshi Kaneda, MD

Department of Orthopedic Surgery, School of Medicine, Hokkaido University, Sapporo, Japan

We measured the changes in distance between the tibial and femoral attachment points of the extraarticular ACL substitute during knee motion. To measure the changes in distance continuously and directly, a com puter-assisted experimental system was developed using an electrolyte-in-rubber transducer. We used 6 cadaveric knees to measure changes in distance of 15 combinations during a simple flexion and extension knee motion. The distance became longer with flexion in each pair of attachment locations. Although the small est change in distance was obtained between the pos terolateral site of the femoral distal metaphysis and a point posterior to the Gerdy tubercle (percent average of the maximum strain was about 12%), it was con cluded that the extraarticular ACL reconstruction is not recommended from a standpoint of isometry of the substitute.

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