this study was to describe the morphologic features of the axillary nerve and its anatomical relationship to the glenoid under true arthroscopic setup. Also, we wanted to determine the practical aspect of the nerve position and its changes in relation to different arm positions during cadaveric arthroscopic simulation. Methods: Eighteen paired fresh-frozen cadaveric shoulder specimens were used for evaluations. None of specimens had previous history of shoulder surgery or scar. Identical shoulder arthroscopic setup was applied to all the specimens, which was the same as the operating room (Lateral decubitus with posterior tilt 30° and 6-8lb traction with 20° flexion and 30° abduction, and pump pressure 80mmHg). Careful removal of capsule and soft tissue revealed the main trunk of the axillary nerve or with some of its branches. The axillary nerve morpho- logic description and documentation from the anterior and posterior portals were performed in all cases. The nearest distance from the glenoid rim was measured using the Neviaser portal with probe. Finally, the nerve was documented of its changes in the distance and its relationship from the glenoid rim depending on four different arm positions (Neutral meaning original trac- tion setup, Abduction, Abduction-IR, and Abduction- ER). At the end of arthroscopic simulation, the nerves were marked and verified by open dissections to see if they were actually true axillary nerve. Results: The axillary nerve almost always appeared in sight of the joint space around inferior edge of the subscapularis muscle after releasing an anterior bundle of inferior gleno-humeral ligament and seemed to be closest to glenoid rim at 5 o‘clock (right) or 7 o‘clock (left). With reference to the glenoid horizontally the main trunk appeared with mean angle of 29.3° (range, 15-35°) in neutral traction. Thereafter the nerve went away from the inferior glenoid rim and disappeared from the joint heading toward the quadrilateral space. The nearest dis- tances from the glenoid rim to the nerve were 10-15mm in 1 shoulder, 15-20mm in 9 shoulders, 20-25mm in 7 shoulders, and 25-30mm in 1 shoulder with neutral arm positions. The four different arm position showed that abduction was helpful for moving the axillary nerve away from the glenoid most. The other two positions, ABD-IR and ABD-ER, did not change much of its rela- tionship than abduction itself, furthermore, obstructed the visual field, which made arthroscopic surgery neither practical nor useful. Conclusions: This study gives arthroscopic view of the main trunk of the axillary nerve. Between 4-8 o‘clock position the nerve appeared, passed through inferior joint with average angle of 29.3° and the nearest distance of 15-20mm most commonly, and then disappeared. Slight abduction and neutral position may be most practical in performing arthroscopic anterior and/or inferior capsular procedures, which made the axillary nerve far distant from the glenoid and provided maximum intraarticular space. Fenestration Capsulorraphy for Multidirectional and Posterior Instability (SS-05). Eugene M. Wolf, MD, E. Rhett Hobgood, MD Purpose: To present the results of a retrospective study evaluating a new arthroscopic technique for treat- ment of multidirectional instability. Methods: Medical records were obtained of patients with disabling multidirectional instability requiring ar- throscopic stabilization. With a minimum of 24 months follow-up, 45 patients treated from December 1999 to September 2004 were available for review. Of this group, 28 patients (31 shoulders) were able to be con- tacted for follow-up evaluation. There were 16 male and 12 female patients. Average age was 30.5 years (range 16-52). The arthroscopic technique focuses on reduction of excessive capsular volume. This was accomplished by creating fenestrations in the capsule. The fenestrations were then sutured closed in a pants-over-vest fashion to the adjacent labrum, or side to side in the areas of rotator interval and posterior capsule. Patients were interviewed and assessed via a previously published Subjective Shoulder Score evaluating six categories: pain, strength, function, stability, range-of-motion, and satisfaction. Results: There were 20 excellent, 7 good, 2 fair, and 2 poor results. Two patients had a recurrence of insta- bility. 93.5% of patients were satisfied or very satisfied with their procedure. Adhesive capsulitis occurred in one patient as the only complication. Conclusions: Reducing capsular volume is an impor- tant objective in the arthroscopic management of multi- directional instability. Suture plication is widely accepted; however, penetrating multiple layers of capsule and labrum can exceed the limit of suture hooks. Fenestration capsu- lorrhaphy actually resects a specific amount of redundant capsule, the lateral margin of which is easily advanced and sutured to the abraded labrum. We have shown that this technique restores stability in this difficult subgroup of instability patients whose primary pathology is capsular laxity. Arthroscopic Revision of Failed Open Anterior Sta- bilization of the Shoulder (SS-06). Ryan T. Bicknell, MD, MSc, FRCSC, Julian Richou, MD, Jean-Francois Gonzalez, MD, Lionel Neyton, MD, Nicolas Jacquot, MD, Christopher Chuinard, MD, Pascal Boileau, MD e3 ABSTRACTS