POSTER ABSTRACTS - ISAKOS

the applied force in PCLR suggests that the soft
tissue structures of the PCL absorb the load to
some extent. The laxity in PCLS, which retains soft
tissue structures other than the PCL, depends on
the applied force. These results suggest that soft
tissue structures, especially the PCL, have a much
greater effect on sagittal laxity than design and
absorb the applied force to some extent.
E-poster #523
Changes in Bone Mineral Density of the
Calcaneus Following
Yoshinori Ishii, Gyoda, Saitama, JAPAN
Hideo Noguchi, Gyoda, Saitama, JAPAN
Ryo Ishii, Gyoda, Saitama, JAPAN
Hiroshi Kiga, Gyoda, JAPAN
Yoshikazu Matsuda, JAPAN, Presenter
Ishii Orthopaedic and Rehabilitation Clinic,
Gyoda, Saitama, JAPAN
This study prospectively measured forty
consecutive patients undergoing total knee
arthroplasty (TKA) to evaluate the relationship
between TKA and bone mineral density (BMD) of
the calcaneus. The mean age at latest follow-op
was 72 years, and all patients had the
preoperative diagnosis of osteoarthritis.
Broadband ultrasound attenuation through the
calcaneus was measured to assess the BMD of
patients. The BMD was measured preoperatively
and 1 month (M), 3M, 6M, 1 year, and 2 years after
TKA. Despite a predicted age-related loss of 4%
during 2 years, 65% of the calcaneus on the
operative side had BMD higher than preoperative
levels and 85% had BMD that was within the
expected 4% age-related loss. TKA might
contribute to decrease the age-related bone loss.
The increase with TKA in patient mobility and the
increased heel loading may be a mechanism
whereby the calcaneus BMD increases. It is
important for surgeons to recognize the objection
beneficial effects of TKA in addition to pain relief.
E-poster #524
Influencing Factors on the Postoperative
Flexion after Total Knee Arthroplasty
Hiroyuki Segawa, Niigata City, Niigata, JAPAN,
Presenter
Tetsurou Morita, Niigata City, Niigata, JAPAN
Hiroto Kobayashi, Niigata City, Niigata, JAPAN
Takui Ito, Niigata City, Niigata, JAPAN
Hiroshi Hatano, Niigata City, Niigata, JAPAN
Niigata Cancer Center, Niigata City, Niigata,
JAPAN
Influencing factors on the
improvement of flexion after TKA were
investigated.
Thirty-two TKAs for
osteoarthritis in 23 patients with minimum followup
of 6 months were included in this study. The
mean age at arthroplasty was 76.5 and mean
follow-up period was 15.6 months. Eighteen
cruciate retaining (CR) TKAs and 14 posterior
substituting (PS) TKAs were performed by a single
surgeon. Preoperative knee extension was -16.1
degrees and knee flexion was 117.8 degrees.
Intraoperative extension and flexion gaps were
measured by Tensor/Balancer device. Joint line
and posterior condylar offset of femur were
measured by the pre- and the postoperative
roentogenographs.
Postoperative knee extension was -0.6
degrees and postoperative knee flexion was 117.8
degrees. Improvement of flexion with PS knee
(113.7%) was significantly better than that with CR
knee (92.7%). Difference of the gaps (flexion gap
minus extension gap) and change joint line up to
6mm did not influenced on improvement of
flexion. Four of eight cases with 3mm decrease in
posterior condylar offset showed improvement of
flexion less than 85%.
Improvement of flexion after CR
TKAs was influenced by the tension of PCL.
Change of joint line should be restored with in
6mm and postoperative posterior condylar offset
should be restored within 3mm.
E-poster #525
Use of Femoral Head Strut Allograft for Severe
Bone Defect in Primary Total Knee Arthroplasty
and Revision Total Knee Arthroplasty
Tae Kyun Kim, Iksan, KOREA,
Young Jin Kim, Iksan, Chunbuk, KOREA
Hwan Duk Yang, iksan, Chunbuk, KOREA
Churl Hong Chun, KOREA, Presenter
School of Medicine, Wonkwang University, Iksan,
KOREA
Purpose : To investigate the clinical and
radiological results after primary or revision total
knee arthroplasty using fresh frozen femoral head
strut allograft for bone defect.
Subjects and Methods : Seventeen patients(18
cases) with severe bone defect were taken primary
or revision TKA from 1997 to 2001 using fresh
frozen femoral head allograft. 12 cases of revision
TKA and 6 of primary TKA were conducted. The