POSTER ABSTRACTS - ISAKOS

asymmetrical space with the narrowing of the
medial gap and maintaining or widening of the
lateral gap at 130 degrees. Even up to 6.8 degrees
external rotation of the femoral component (4.5
degrees on average), there was no case showing a
larger medial gap than lateral at 90 degrees
flexion. The statistical analysis revealed that
increased external rotation of the femoral
component significantly reduce the amount of the
medial flexion gap narrowing at 130 degrees.
Conclusion: Our results indicate that the
commonly reported 3 degrees of external rotation
relative to the PCA and aligning the femoral
component parallel to the surgical TEA would be
an insufficient external rotation’ especially in the
Asian female osteoarthritic patients whose
lifestyle frequently requires deep knee flexion.
E-poster #544
The Early Results of LPS-Flex Fixed Bearing
Total Knee Arthroplasty
Myung Chul Lee, Seoul, KOREA,
Sang Cheol Seong, Seoul, KOREA
Chong Bum Chang, Seoul, KOREA, Presenter
Sahnghoon Lee, Seoul, KOREA
Joonoh Lee, Seoul, KOREA
Seoul National University Hospital, Seoul, KOREA
Introduction: LPS-flex knee prosthesis was
specially designed to safely accommodate deep
knee flexion of up to 155 degrees. The purpose of
this study was to evaluate the early results of LPSflex
fixed bearing prosthesis to assess whether
this new implant had achieved its design
objectives.
Materials and Methods: Between Jul. 2001 and
Mar. 2003, 99 total knee arthroplasties of 72
patients were performed with LPS-flex prosthesis
and followed for a minimum of one year (mean:
22months). Of the 72 patients, 68 patients (94
knees) were female and 4 patients (5 knees) were
male. The mean age at the time of surgery was
sixty nine years and mean weight and height were
63kg and 153cm. The preoperative diagnoses
included osteoarthritis in 95 knees and
rheumatoid arthritis in 4 knees. We evaluated the
change in postoperative range of motion over
time. Knee rating system of the Hospital for
Special Surgery and Knee Society clinical rating
system were used for clinical evaluation.
Results: The mean range of motion improved from
119.3 degrees to 127.2 degrees at the time of
latest follow-up. The mean range of motion at six
months was 123 degrees, 128 degrees at one year
and 127.8 degrees at two years. The change in
mean range of motion from six months to one
year was significant but no significant change was
found after one year postoperatively. The mean
Hospital for Special Surgery knee score improved
from 60 points to 86 points (p