Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Arthroplasty - Knee
Abstract number: 24255
TENSOR-BASED DETERMINATION OF ROTATION OF THE FEMORAL
COMPONENT INCREASED RANGE OF MOTION OF POSTERIOR-STABILIZED
TOTAL KNEE ARTHROPLASTY
Seneki KOBAYASHI
Suwa Red Cross Hospital, Suwa (JAPAN)
A series of 170 primary Optetrak posterior-stabilized total knee arthroplasties in 138
patients were studied to examine effects of changes in surgical techniques on clinical
results. The average patient age at operation was 72 years and 78% were in female
patients. Knee disease etiology was primary osteoarthrosis in 77%. At the time of
operation, all the components were cemented. The rotation of the femoral component
was 3 degrees in external rotation with reference to the posterior-condylar line initially
(Fixed-rotation Group; 99 knees, 58%). Since 2002, the rotation was determined to
get a rectangular gap in 90-degree flexion of the knee using a tensor (Tensor-basedrotation
Group; 71 knees). The Knee Society knee and patient-function scores
improved significantly after surgery in each group. No case developed impending
failure requiring revision. Preoperatively, there were no significant differences in the
scores between the groups. Postoperatively, range of motion was statistically
significantly larger in the Tensor-based-rotation Group than in the other at 3 months,
6 months, 1 year, 2 years, and the latest follow-up (5.6 years in Fixed-rotation Group,
3.5 years in Tensor-based-rotation Group, on average). The knee score was also
significantly better in the Tensor-based-rotation Group than in the other at each
follow-up. This study clearly demonstrates the benefits of the tensor-based
determination of the rotation of the femoral component that can provide a rectangular
flexion gap resulting in an increased range of motion of the knee.
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