POSTER ABSTRACTS - ISAKOS

e observed in 32 cases because of synovitis.
Among 69 cases, the popliteofibular ligament was
identified in 51 cases, and was not identified in 18
cases. In 75 of 101 cases we were able to examine
the stability of the popliteus tendon by probing,
and in 26 cases we were not able to examine the
stability of the popliteus tendon because of
tightness of lateral joint space. Among 75 cases
that were examined by proving, the anteriorinferior
instability of the popliteus tendon was
observed in all cases and the posterior-superior
instability of the popliteus tendon was observed
in 5 cases. Among 75 cases that were examined
stability of the popliteus tendon, the
popliteofibular ligament was observed in 39 cases
and those did not show the posterior-superior
instability. In 5 cases that showed the posteriorsuperior
instability, the popliteofibular ligament
were not observed arthroscopically.
[Conclusion] The popliteofibular ligament were
able to be seen arthroscopically in only 51 of 101
cases. The arthroscopic view of popliteofibular
ligament is not incredible for diagnostic method
of the popliteofibular ligament injury. But the
popliteus tendon was stable against posteriorsuperior
force and not stable against anteriorinferior
force. This result suggests that the
probing of the popliteus tendon arthroscopically
serves to
assess the function of the popliteofibular
ligament.
E-poster #618
Collateral Ligament Releases and the Effect on
Femoral Component Rotation in Total Knee
Arthroplasty
Wilco Jacobs, Nijmegen, NETHERLANDS,
Presenter
Ate BinneWymenga, Nijmegen, Gelderland
NETHERLANDS
Sint Maartenskliniek, Nijmegen, NETHERLANDS
Introduction: Internal rotation of the femoral
component in total knee arthroplasty has been
reported to cause pattellofemoral problems.
Common references for determining the rotation
of the femoral component are the epicondylar
line, the condylar line (three degrees), and the
Whiteside (antero-posterior groove) line.
Measurements on human femora have shown that
using these references insert the femoral
component in external rotation. When ligament
balance is used (lamina spreader or tensioner in
flexion) to determine femoral rotation, control of
the amount of rotation is lost, but assumed to be
safe if set in external rotation.
Goal: The goal of this study was to register the
collateral releases performed to acquire ligament
balance in extension and evaluate the influence
on femur component rotation
Methods: Subjects for this study were 60 patients
undergoing primary total knee arthroplasty by one
surgeon. The releases needed to create correct
alignment were recorded. These structures are
deep ligament, tibial tract, popliteal tendon,
fibular ligament, and posterallateral condyle for
the lateral side and deep ligament, superficial
ligament, posteromedial condyle and
semimembranosis for the medial side. After the
releases in extension, a tensioner (150 N) was
used to determine the femoral component
rotation required to create a balanced flexion gap.
The rotation of the posterior bone cut was
measured relative to the posterior condylar line. A
custom-made goniometer was used.
Results: Preoperative alignment was 1.6 degrees
(from -14 to +15). Average external rotation of the
femoral component with the ligament balancing
technique was 2.7 degrees (from 4 internal to 10
external rotation; SD 3.5 ). Eleven components
were placed in slight internal rotation. There was a
significant difference between the rotation of the
femoral component between lateral released
knees and medial released knees.
Conclusion: The ligament balancing technique
places the femoral component in an average of 2.7
degrees external rotation, with a large interindividual
variation. This variation is within a safe
range, but more research is necessary on the
influence of the release of the separate structures
to enable control of the femoral component
rotation.
E-poster #619
Ligament Reconstruction After Traumatic Knee
Dislocation
Matheos Tzurbakis, Athens, GREECE, Presenter
Andreas Panagiotis Diamantopoulos
Nikolaos Kanakaris, Athens, GREECE
Ioannis Georgilas, Athens, GREECE
Orthopaedic Department, Evangelismos Gen.
Hospi, Athens, GREECE
Purpose: The objective of this study was to
evaluate the results of surgical treatment of knee
dislocations.
Material/Method: Review of our patients’ records
revealed that the last 8 years, 24 patients were