157.
Stress radiographic evaluation of knee collateral ligament laxity
using the Telos-Device correlates with objective examination of knee
instability
Mads Carlsson, Bent Lund, Peter Faunø, Svend Erik Christiansen, Martin
Lind
Div, Sportstrauma. Orthopaedic Dept. Aarhus University Hospital; Div,
Sportstrauma. Orthopaedic Dept. , Aarhus University Hospital; Div,
Sportstrauma. Orthopaedic Dept. , Aarhus University Hospital; Div,
Sportstrauma. Orthopaedic Dept. , Aarhus University Hospital; Div,
Sportstrauma. Orthopaedic Dept. , Aarhus University Hospital
Background:
Biomechanical studies have demonstrated that stress
radiographic evaluation of collateral ligament laxity relates to degree of
ligament injury. Stress radiographic evaluation of collateral ligament laxity
could therefore be an important supplement for clinical decision-making prior
to knee collateral ligament reconstruction surgery
Purpose / Aim of Study:
The present study investigates the correlation
between objective clinical evaluation of collateral ligament laxity and stress
radiographic evaluation using the Telos-Device (TD) in patients with collateral
knee ligament laxity after knee injury.
Materials and Methods:
In 56 patients with subjective collateral knee
instability after knee injury, medial and lateral knee instability was clinically
evaluated using International Knee Documentation Committee (IKDC)-
classification with varus og valgus knee laxity expressed as side-to-side
difference in joint opening (grade A 0- 2mm; grade B 3-5mm; grade C; 6-
10
mm; grade D >10mm). All patients who had minimum grade B laxity of
either medial or lateral collateral ligament had supplementary TD stress
radiography. The stress radiographic measurements were correlated with
IKDC evaluations. We used the non-injured side as IKDC grade A control
group.
Findings / Results:
Stress radiographic laxity measures correlated with IKDC
objective clinical examinations. For IKDC grade A, TD joint opening was
average 0.12mm. For IKDC grade B, TD joint opening was average 1.49mm
For IKDC grade C, TD joint opening was average 2.57mm
Conclusions:
TD Stress radiographic evaluation of collateral knee ligament
laxity correlated with objective knee laxity evaluation. As clinical knee laxity
evaluation is complex, stress radiographic evaluation of collateral knee
ligament laxity can support decision-making prior to collateral ligament
reconstructive surgery
