POSTER ABSTRACTS - ISAKOS

was 477 ml. The duration of operation was 88
min. The average length of the scar 66mm(+/-8).
The visual analog scale was 2.5 at day 1, 1.5 at day
2 and 1.18 at day 3. The length of stay was 8 days.
We don’t have any postoperative neuropathy or
dislocation. A significant increase in a mean of
Harris and Merle Aubign scores were observed,
respectively from 57 to 82 and from 11 to 15 and
decrease of score of Womac of 40 points. Average
abduction of cup was 43 (+/-6). The femoral
stems were in 1.2 (+/- 1.81) varus position. There
is no discrepancy of length more than 5 mm.
Conclusions:
This study confirms that the mini-incision
technique and specific instrumentation allows a
good positioning of prosthetic components, this
been one of the primary objectives of total hip
arthroplasty without lengthen the duration of
operation. There are several contraindications for
this mini-incision technique which include
obesity, severe dyplasia, malunions and
arthrodesis of the hip. Esthetically the scar is
more pleasing, which is important in our society.
This technique seems to give good preliminary
results and encourages us to go on with technique
E-poster #1001
A Case of OS Odontoideum Incidentally
Detected by Sports Medical Check
Hitoshi Abe, Minato-ku, JAPAN,
Yasunori Tsukimura, Minato, Tokyo, JAPAN
Shoei Takeshima, Minato, Tokyo, JAPAN
Masaki Nagashima, Minato, Tokyo, JAPAN
Morio Matsumoto, Shinjyuku, Tokyo, JAPAN
Hideo Matsumoto, Tokyo, JAPAN
Kazuhiro Chiba, Shinjuku,Tokyo, JAPAN
Yoshiaki Toyama, Shinjyuku, Tokyo, JAPAN
Orshopaedic Depart. of Kitasato Institute
Hospital, Minato, Tokyo, JAPAN
[purpose] Os odontoideum is considered to be
congenital or secondary to odontoid fracture. We
experienced a case of os odontoideum
incidentally detected by sports medical check.
[case] Sixteen-year-old boy had played rugby for
three years and had occasionally felt numbness in
the upper and lower extremities when he was
tackled. He had an episode of transient
quadriparesis, but no medical investigation was
conducted at that time. When he joined a high
school rugby team, he underwent obligatory
sports medical check. Os odontoideum was found
on plain radiograph. He was referred to our
hospital for further investigation and treatment.
At the time of initial examination, he had no
symptom at all, and neurological examination
revealed no abnormality. On X rays, os
odontoideum was evident, and atlantodental
interval in flexion was 12mm. This anterior
subluxation was perfectly reduced by extension of
the neck. On MRI, compression of the spinal cord
was not observed. Because of marked atlantoaxial
instability and of history of transient
quadriparesis, surgery was deemed to be
necessary and performed on March 13, 2003.
The operation was performed by the Magerl and
Brooks method. Instability between C1/2 was
remarkable, but rigid fixation of the atlantoaxial
joint was achieved by transarticular screwing and
sublaminar wiring. One year after surgery, solid
arthrodesis was obtained, and the patient had no
pain or neurological abnormality. However, ranges
of neck motion were reduced to the halves of
preoperative values.
[Discussions] The etiology and choice of
treatment of os odontoideum are controversial.
Patients of os odontoideum with no or mild
symptoms are sometimes found incidentally by
radiographic examination taken after mild trauma
or at medical checks as was this case. In the
present case, the sports medical check was
extremely useful, preventing the patient from
catastrophic neurological damage. Since the
patient had a history of transient quadriparesis
and remarkable instability on flexion-extension X-
rays, atlantoaxial arthrodesis was thought to be
mandatory. Return to rugby play after surgery was
also a matter of controversy. Although the patient
achieved solid bone union, he was not allowed to
return to rugby play because his limited neck
motion might make his cervical spine more
vulnerable to trauma due to hard contusion to the
neck during rugby play.
E-poster #1002
Associated Changes in Glenohumeral Joint in
Rotator Cuff Tear
Chang-Hyuk Choi, Taegu, KOREA, Presenter
Koing-Woo Kwun, Taegu, Taegu, KOREA
Shin-Kun Kim, Taegu, Taegu, KOREA
Sang-Wook Lee, Taegu, Taegu, KOREA
Myung-Rae Cho, Taegu, Taegu, KOREA
Sang-Bong Ko, Taegu, Taegu, KOREA
Catholic University of Taegu, Taegu, KOREA
Purpose: To identify associated findings in
glenohumeral joint in rotator cuff tear and
evaluate its clinical significance, we examined