POSTER ABSTRACTS - ISAKOS

central insertion point of the two parts of the
coracoclavicular ligament were found to be at an
average distance of 3.8 (Lig. trapezoideum) and
5.6 cm (Lig. conoideum) from the AC-joint. The
resulting force vector of the suture located
between the anchor and the drill hole was close to
the anatomic force vector of this ligament. The
suture cerclage was always correctly positioned.
Its oblique arms approached a 45 angle in
relation to the longitudinal axis of the AC-joint.
Conclusion:
The presented technique is at minimal risk for the
surrounding neurovascular structures and allows
for a minimally invasive and anatomically correct
reconstruction of the AC-joint. It is therefore a
reasonable alternative to existing invasive
techniques of open reconstruction of Rockwood
type III AC-dislocations in high-demand patients.
E-poster w/ Standard #949
Biomechanical Analysis of Arthroscopic Rotator
Cuff Repair Suture Configurations: Double Row
vs Single Row Fixation
C. Benjamin Ma, USA, Presenter
Lyn Comerford, San Francisco, CA, USA
Joseph Wilson, San Francisco, CA, USA
Christian Puttlitz, San Francisco, CA, USA
University of California, San Francisco, San
Francisco, CA, USA
Background: Arthroscopic rotator cuff repairs have
been limited to simple and horizontal stitches.
Recent objective evaluations have demonstrated
high failure rates of arthroscopic rotator cuff
repairs. Our previous study has demonstrated
that the massive cuff stitch can increase the
strength of the suture-tendon interface. In this
study, we evaluated the biomechanical properties
of a few novel arthroscopic rotator cuff repair
stitches, including variations of single row
fixations such as the simple, massive cuff and
arthroscopic Mason-Allen with the double row
fixation.
Methods: Six pairs of human supraspinatus
tendons were harvested and split in half to yield a
set of four tendon specimens per cadaver. Four
stitch configurations (simple, massive cuff,
arthroscopic Mason-Allen and double row
fixation) were randomized and biomechanically
tested on each set of tendon specimens. Each
specimen was first cyclically loaded on an MTS
uni-axial load frame under force control from 5-
100N at 0.25Hz for 50 cycles. Each specimen was
then loaded to failure under displacement control
at a rate of 1mm/sec. Cyclic elongation, peak-topeak
displacement, ultimate tensile load and
stiffness were measured using an optical motion
analysis system and load cell output. The type of
failure (suture-breakage or pull-out) was also
recorded. A repeated-measures ANOVA was
performed on the results with the alpha level of
statistical significance set at p< 0.05.
Results: For the cyclic loading test, there was no
significant difference in peak-to-peak
displacement among the four stitches. However,
the double row fixation does have the lowest
peak-to-peak displacement 1.2 ± 0.2 mm when
compared with the three single row fixations, 1.4
± 0.6mm. Ultimate load for the double row
fixation (318 ± 72N) was significantly higher than
the simple (207 ± 47N) but not significantly
different than the arthroscopic Mason-Allen (229
± 81N) and massive cuff stitch (243 ± 60N). There
was no significant difference in the stiffness
between the 4 stitch configurations. However, the
arthroscopic Mason-Allen stitch does have the
lowest stiffness (35 ± 11N/mm) when compared
with the other three stitch configurations (42-44
N/mm).
Conclusions: Double row fixation has significantly
higher ultimate tensile load when compared with
the traditional simple stitch configuration. Peakto-peak
displacement is also lowest although the
difference was not significant when compared
with the three single row fixations. Arthroscopic
Mason-Allen stitch has comparable ultimate
tensile load as the massive cuff stitch, however,
stiffness of the construct is less comparable.
Double row fixation can provide a more secure
and biomechanically improved construct when
compared with the three single row fixation suture
configurations.
E-poster #950
Slap Lesion in Athletes: An Epidemiologic
Study.
Gustavo Cara Monteiro, Sao Paulo, BRAZIL,
Presenter
Benno Ejnisman, Sao Paulo, BRAZIL
Carlos Vicente Andreoli, Sao Paulo, BRAZIL
Alberto Castro Pocchini, Sao Paulo, BRAZIL
Moises Cohen, Sao Paulo, BRAZIL
CETE/EPM/UNIFESP, Sao Paulo, BRAZIL
We rewied 632 arthroscopies in athletes, and
found 57 slap lesions(9%).
According to snyder´s classification, the occurence
of each type was 18(33,3%) type ii slap lesion,