POSTER ABSTRACTS - ISAKOS

TEA would be an insufficient external rotation
especially in the Asian female osteoarthritic
patients whose lifestyle frequently requires deep
knee flexion.
E-poster w/ Standard #547
New Parameter of Flexion Status After
Posterior Stabilized Total Knee Arthroplasty:
Posterior Condylar Offset Ratio on X-ray
Photographs
Yoshinori Soda, Hiroshima, JAPAN, Presenter
Jiro Oishi, Hiroshima, JAPAN
Tomoyuki Nakasa, Hiroshima, Hiroshima, JAPAN
Mitsuo Ochi, Hiroshima, Hiroshima, JAPAN
Hiroshima City Hospital, Hiroshima, JAPAN
Introduction:
The demand for acquiring deep flexion needed in
the life style of Asian countries including JAPAN is
higher than ever. In cruciate-retaining type TKA,
the increase in posterior condylar offset (PCO),
Bellemans reported in 2002, is generally
considered to be correlated to flexion angle
acquired postoperatively. However, the
significance of PCO differs according to the size of
joint. Furthermore, correction is required for the
difference in scale of photographs. Thus, for
comparison of posterior clearance, it was
considered reasonable to study the ratio by some
standard. We have therefore defined a new
parameter of posterior condylar offset ratio
(PCOR= PCO/ antero-posterior diameter of
femoral component).
Objectives:
The purpose of this study was to compare PCOR
in PS type TKA of postoperative flexion
satisfactory group and postoperative flexion
unsatisfactory group and to study the significance
of this value.
Patients & Methods:
From January 1999 to December 2003, PS type TKA
was conducted on 179 joints at our institution. Of
these, the subjects of this study were 80 knees (8
males and 72 females, with mean of 75 years-old)
with osteoarthritis more than 6 months
postoperatively.
Patients were divided into groups as follows; In
postoperative flexion angle (FA), patients with FA
of less than 100 degrees were divided into Group
A, patients of 100 degrees and greater were
divided into Group B. In flexion achievement rate
(AR), patients with AR of less than 100% were
divided into Group C, patients of 120% and greater
were divided into Group D.
PCOR was computed and compared in each
group, respectively.
Results:
In FA, PCOR in Group A (n=14; 0.375) was
significantly lower (p=0.027) than that in Group B
(n=29; 0.428). In AR, PCOR in Group C (n=23;
0.376) was significantly lower (p=0.0018) than that
in Group D (n=11; 0.456).
Conclusions:
This study demonstrated that PCOR in flexion
satisfactory group is significantly higher than that
in unsatisfactory group. We have concluded that
our defined PCOR could serve as a parameter of
postoperative flexion status of PS type TKA.
E-poster w/ Standard #548
Clinical Outcome Following Bilateral Staged
Total Knee Arthroplasty
Rathnam Obli Sundaram, Warrington, UNITED
KINGDOM, Presenter
Rose Finley, Upton, Cheshire UNITED KINGDOM
Robert Harvey, Upton, Wirral, Cheshire UNITED
KINGDOM
Richard W Parkinson, Neston, Cheshire UNITED
KINGDOM
Department of Orthopaedics, Upton, Wirral,
UNITED KINGDOM
Introduction: Clinical outcome studies have
shown excellent results following unilateral total
knee arthroplasty (TKA). A wide Pub Med search
failed to find any literature on the outcome of
results following bilateral staged TKA.
Aim: To determine the clinical outcomes of
patients undergoing bilateral staged TKA.
Material & Methods: Patients who underwent
bilateral staged TKA between 1994 - 2002 were
assessed using the Knee Society Score (KSS) and
Western Ontario and MacMaster Osteoarthritis
Index (WOMAC) scoring systems. They were also
asked regarding which TKA they considered better
and why.
Results: We clinically reviewed 110 patients who
underwent bilateral staged TKA. The mean
clinical follow-up time was 5.13 years. The mean
pre-operative KSS was 95.8 for the right knee and
95.5 for the left knee. The mean post-operative
KSS was 154.1 for the right knee and 155.9 for the
left knee. Patients mean post-operative WOMAC
scores for the right knee were; Pain - 1.67,
Stiffness - 1.17 and Function - 10.78. Patients
mean post-operative WOMAC scores for the left
knee were, Pain - 1.77, Stiffness - 1.14 and
Function - 10.69. Objectively there was no