Aim. The aim of this study was to correlate the length (measured by computed tomography) of the anterior cruciate neoligament following knee surgery with the time required by the flexors-extensors of the knee to reach isokinesis (measured using an isokinetic method). Material and methods. Twenty-five patients (all males, median age 25.4 years), who had undergone surgical repair of the anterior cruciate ligament (ACL), were assessed by computed axial tomography (CT) and isokinetic tests a mean of 6.3 months after their operation. The following isokinetic parameters were calculated: time to reach isokinesis in flexion, time to reach isokinesis in extension, flexion strength, and extension strength. Mean values were calculated from all the values recorded during the test cycles performed. The CT examinations, after lateral scanograms, were carried out with 1 mm contiguous axial scans parallel to the tibial plate. It was possible to assess the integrity of the neoligament which was measured from a section of the tibial plate above the tibial cartilage to its insertion in the intercondylar furrow. Results. As expected, all the values recorded from the healthy knee were significantly different from those recorded on the operated side. As far as concerns analysis of any correlations, there were good correlations between the time to reach isokinesis in extension and the length of the ACL both on the operated side (r=0.62) and the healthy side (r=0.69), whereas the correlations between the length of the ACL and all other measurements were moderate or very weak (from 0.44 to 0.03). Discussion and conclusion. That the isokinetic measurements show an increased time for the extensor muscles of the operated knee to reach isokinesis is related to altered biomechanics of the passage of the tibia from a "posterior translaction" position to one of an "anterior translaction" that is, to anterior displacement of the tibia during extension of the knee, which leads to the prolonged time. The correlation between this time and the length of the ACL, as measured by CT, offers the possibility of being able to monitor the outcome of cruciate ligament repair periodically during various phases of rehabilitation treatment and of only using control CT examinations if there are any complications and/or problems.
|Translated title of the contribution||Correlation between computed tomography and isokinesis in patients with reconstructive surgery of anterior cruciate ligament of the knee|
|Number of pages||4|
|Publication status||Published - Nov 2001|
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging