POSTER ABSTRACTS - ISAKOS

findings, a computerized knee laxity analysis and
functional tests. Isokinetic flexion, extension and
internal rotation-external rotation testing were
also performed. Furthermore we analysed deep
flexion strength. The results were subjected to
statistical analysis.
RESULTS: We did not find any significant
difference between the two groups in terms of the
standard knee scores, subjective assessment,
clinical findings, computerized knee laxity
analysis, flexion-extension and external rotation
strengths as well as functional tests. We noted
however that the internal rotation torque deficit
was significantly higher in the STG group
(p=0.039). Likewise, the external to internal
rotation ratio was significantly greater (p=0.006)
as well as deep flexion deficit ( p= 0. 042) in the
STG group.
CONCLUSION: Although there is not much
clinical difference when using the ST alone versus
the STG construct, internal rotation and deep
flexion weakness following harvest of two tendons
may need to be evaluated further. We suggest that
whenever possible, only one tendon should be
used in when performing ACL reconstruction with
hamstring tendons.
E-poster w/ Standard #418
Analysis of the Relationship Between Knee
Hyperextension and the Slope of the
Intercondylar Notch Roof
Ryuichi Nakamura, Kanazawa, Ishikawa, JAPAN,
Presenter
Katsuhiko Kitaoka, Kanazawa city, Ishikawa,
JAPAN
Yoshinobu Maruhashi, Kanazawa city, Ishikawa,
JAPAN
Akira Okano, Kanazawa city, Ishikawa, JAPAN
Kenichi Nakamura, Kanazawa, Ishikawa, JAPAN
Yosuke Shima, Kanazawa, Ishikawa, JAPAN
Kanazawa University, Kanazawa, JAPAN
Introduction
Impingement of the ACL graft to the intercondylar
notch roof has been suggested to be a cause of
graft failure after ACL reconstruction. Whether the
graft impinges to the roof is mainly dependent on
the following three factors: 1) the position of the
tibial bone tunnel, 2) the slope of the
intercondylar notch roof, and 3) the degree of
hyperextension. The purpose of this study was to
examine the relationship between knee
hyperextension and the slope of the intercondylar
notch roof to determine the theoretical
impingement-free tibial tunnel position by means
of analysis of the lateral view of the uninjured
knee.
Materials and Methods
A total of sixty subjects with an average age of
18.7 years (10 men and 50 women) with unilateral
anterior cruciate ligament rupture were examined
by fluoroscopy. Under general anesthesia after
ACL reconstruction, the heel of the uninjured side
was elevated 20 cm from the operation table to
allow maximum hyperextension of the knee. The
precise lateral view of the uninjured knee was
then taken with an image intensifier with
superimposition of the medial and lateral
condyles. Hyperextension angle (HEA), rooffemoral
angle (RFA), and roof-plateau intersection
ratio (RPIR) were measured from each film. HEA
was defined as the angle between the line of the
anterior cortex of the femur and that of the
posterior cortex of the tibia. RFA and RPIR were
defined as follows according to the method
reported by Buzzi et al. RFA was determined by
the angle formed by the line of the roof of the
notch (Blumensaat’s line) and the anterior cortex
of the femur. RPIR was calculated as the following
ratio: distance from the anterior margin of the
tibia to the intersection between Blumensaat’s
line and tibial plateau/ the sagittal width of the
tibia. Simple regression analysis was used to
determine the relationships between HEA and
RFA, and HEA and RPIR.
Results
Mean HEA was 13.8 (range, 7 to 27 ), that of RFA
was 40.3 (range, 30 to 54 ), and that of RPIR was
25.6% (range, 11% to 53%). There was a direct
positive relationship between HEA and RFA
(RFA=0.67*HEA+31, R=0.63, P