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The Journal of Bone and Joint Surgery, Vol 72, Issue 9 1299-1306, Copyright © 1990 by Journal of Bone and Joint Surgery, Inc
Arthrometric evaluation of knees that have a torn anterior cruciate ligament
BR Bach, RF Warren, WM Flynn, M Kroll and TL Wickiewiecz
Department of Sports Medicine, Hospital for Special Surgery, New York City, N.Y. 10007.
We used the KT-1000 arthrometer to test the knees of 107 patients who had
an acute tear of the anterior cruciate ligament, 153 patients who had a
chronic tear, and 141 control subjects, for a total of 401 individuals. The
three testing parameters were the extent of anterior translation at
eighty-nine newtons of force and at maximum manual force, and the
compliance index. The differences between the involved and the uninvolved
knees were calculated. At eighty-nine newtons, all but one of the control
subjects had anterior translation of ten millimeters or less, compared with
58 per cent of the patients who had a chronic tear. At maximum manual
force, all but two of the control subjects had translation of ten
millimeters or less, compared with 20 per cent of the patients who had an
acute or a chronic tear. Analysis of variance showed that the clinical
diagnosis correlated well with the results for all tests (p less than
0.001). However, when the uninjured knees of patients who had an acute or a
chronic tear were compared with the knees of the control subjects,
significant differences were noted (p less than 0.001 to 0.006). In the
patients who had a chronic tear, there was no relationship between the time
from injury to operation and the extent of anterior translation. The
arthrometric test at maximum manual force was the strongest discriminant;
it differentiated normal from abnormal knees (p less than 0.001) with high
sensitivity (92 per cent), high specificity (95 per cent), and high
positive predictive accuracy; the cut-off point was eleven millimeters or
less.(ABSTRACT TRUNCATED AT 250 WORDS)
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