• 대한관절경학회:학술대회논문집
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• 2009.10a
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• pp.135-137
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• 2009

• Clinics in Shoulder and Elbow
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• v.12 no.2
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• pp.207-214
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• 2009

Purpose: In arthroscopic rotator cuff repairs there are generally weak link in tendon suture interface, arthroscopic rotator cuff repairs can have higher retear rates than open repairs. The purpose of this study was to compare the strength of UU (Ulsan University) suture than open modified MA (Mason-Allen) suture when suture anchored into bone. Materials and Methods: The human supraspinatus tendons were harvested from the shoulder of the cadaver and split in 2 times, producing four tendons per one shoulder, for a total of 24 specimens. Two suture configurations (UU, MA) were randomized and checked on each set of tendons. Specimens were cyclically loaded under force control between 5 and 30 N at 0.25 Hz for fifty cycles. Each specimen was loaded to failure under displacement control at 1 mm/sec. Cyclic elongation, peak to peak displacement, stiffness, ultimate tensile load, mode of failure were checked. Results: No significant difference was found between two suture configuration with respect to peak to peak displacement, cyclic elongation, and stiffness. With regard to ultimate failure load, there were no significant difference statistically between the UU suture and modified MA suture (109.4 N, 110.6 N). The most common mode of failure between both sutures was suture pull-out through the tendon. Conclusion: The UU suture and modified MA suture produced similar biomechanical properties.

• Clinics in Shoulder and Elbow
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• v.15 no.2
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• pp.99-108
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• 2012

Purpose: To evaluate the clinical results of arthroscopic repair with UU-Tension Band suture for full thickness rotator cuff tear above 4 cm sized. Materials and Methods: From January 2006 to October 2011, in 71 full thickness tears above 4 cm sized which is possible to arthroscopic repair to medial margin of greater tuberosity. The group I is 71 patients which is arthroscopic repair with UU-Tension Band suture, and the group II is 20 cases which is arthroscopic repair with simple suture. Both groups were compared with a VAS score for pain, Activity of Daily Living, UCLA score, KSS score in pre operation, 7 months, 1 year and last follow-up. Statistical analysis was performed by student t test and paired t est. Mean age was 63.2 (52~80) year old, mean follow-up was 38.4 (13~62) months. Results: The VAS scores for pain decreased from 8.1 at preoperative period to 1.6 at postoperative last follow-up period in group I (p<0.05), the score decreased from 7.6 at preoperative period to 1.8 postoperative last follow-up period in group II (p<0.05). The significant difference was not noted between two groups (p<0.05). Mean ADL scores increased from 12.5 at preoperative period to 29.0 post operative last follow-up period in group I (p<0.05), the score increased from 11.3 in pre op to 27.5 post-operative last follow-up in group II (p<0.05). The significant difference was not noted between two groups (p<0.05). The UCLA score increased from 12.9 at preoperative period to 28.7 postoperative last follow-up period in group I (p<0.05), the score increased from 13.8 at preoperative period to 30.1 postoperative last follow-up period in group II (p<0.05). The significant difference was not noted between two groups (p<0.05). In comparing of retear which was checked by MRI and ultrasound evaluated at postoperative period 7 months (mean: 27.5 weeks), the retears were 28% in the group I, and 11 shoulders out of 20 shoulders in the group II. The significant differences were noted between two groups (p<0.05). Conclusion: Arthroscopic repair with UU-Tension Band suture and simple suture for full thickness rotator cuff tear above 4 cm sized were not different clinical result between both groups. However, the significant differences were noted in point of failure rate between both groups.

• Clinics in Shoulder and Elbow
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• v.13 no.2
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• pp.250-259
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• 2010

Purpose: The purpose of this study was to evaluate the usefulness and clinical results of arthroscopic double row repair with UU stitches for massive, full-thickness, rotator cuff tears. Materials and Methods: Between January 2007 and July 2009, we consulted on 36 massive tears in which it was possible to repair the middle area of the greater tuberosity by arthroscopy. One group consisted of 11 cases that had a double row repair with UU stitches. A second group consisted of 20 cases that had a single row repair with simple stitches. We compared the 2 groups for pain, Activities of Daily Living, UCLA score, and KSS score. We did this pre operatively, and at 6 months, 1 year and final follow-ups. Statistical analysis included Student's t test and a paired t est. Mean age was 59 (48~70); mean follow-up was 28 (12~43) months Results: VAS scores decreased from 7.5 pre operatively to 1.5 post operatively at the last f/u in the $1^{st}$ group (p<0.05). In the $2^{nd}$ group, the score decreased from 7.6 in pre op to 1.8 post operatively at the last f/u (p<0.05). There was no significant difference between the two groups (p>0.05). Mean ADL increased from 11.5 to 25.1 at the last f/u in the $1^{st}$ group (p<0.05); in the $2^{nd}$ group the ADL score increased from 11.3 to 27.5 (p<0.05). There was no significant difference between the two groups (p>0.05). The UCLA score increased from 13.9 to 31.6 in the $1^{st}$ group (p<0.05), while in the $2^{nd}$ group the score increased from 13.8 to 30.1 (p<0.05); there was no significant difference between the two groups (p>0.05). Comparing MRIs at 3 and 6 months post op, there were retears in 3 of 9 cases in the first group, and in 8 of 15 cases in the second group; there was no significant difference between the two groups (p>0.05). Conclusion: Arthroscopic double row repair with UU stitches for massive, full-thickness rotator cuff tears showed no differences in clinical results. However, it was associated with a significant difference in the incidence of retears.

• Journal of the Korean Arthroscopy Society
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• v.17 no.1
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• pp.1-5
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• 2013

Purpose: To evaluate the clinical results of arthroscopic repair with Ulsan University - Mason Allen - Suture Bridge (UU MA SB) stitch for the full thickness rotator cuff tear. Materials and Methods: Fifteen patients with full thickness rotator cuff tear underwent arthroscopic repair with UU MA SB stitch between September 2010 and December 2010. Clinical and functional evaluations were made according to Korean shoulder score (KSS), American shoulder and elbow surgeon (ASES), University of California, Los Angeles (UCLA), visual anabgue scale (VAS) and the range of motion. Results: The mean KSS improved from 51.4 preoperatively to 92.0 at final follow-up (p<0.05). The mean UCLA score improved from 15.07 preoperatively to 31.93 postoperatively, the mean VAS of pain during the motion was 7.2 before treatment and 0.93 at final follow-up (p<0.001). At last follow-up, the mean range of motion was improved but they had not shown statistical significance (p>0.05). Conclusion: The arthroscopic repair with UU MA SB stitch may be an effective procedure in the full thickness rotator cuff tear for pain relief and improvement of the range of motion.

• Clinics in Shoulder and Elbow
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• v.14 no.1
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• pp.67-72
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• 2011

Purpose: There are various known methods for arthroscopic rotator cuff repair. The purpose of this retrospective study is to report on the clinical results and anatomical results of UU repair surgery, which is a new repair method. Materials and Methods: We enrolled 156 patients (88 men and 68 women) who underwent UU repair for rotator cuff tears from January 2009 to May 2010 in our hospital. Their average age was 55 years old (range: 38~75 years old) and the average follow-up period was 12 months (range: 6~23 months). For determining the results, we evaluated the VAS for pain, the daily living index (ADL) in the ASES scores, the UCLA and KSS scores, and all these tests were conducted at the first hospital visit and 6 months and 1 year after surgery and at the final follow-up. During the follow-up period, MRI was performed 3 and 6 months after surgery only in the patients who consented to MRI scans to confirm the presence of re-rupture. Results: The average scores of the VAS as a pain indicator decreased from 7.0 before surgery to 2.7 after surgery (p<0.05). The UCLA and KSS scores increased from 22.2 to 32.5 and from 83.7 to 91.5, and the changes was significant (p<0.05). For the active joint range of motion, the average forward flexion was improved from 125 to 175 degrees, the average lateral external rotation was improved from 38 to 58 degrees, and the average abduction was improved from 104 to 169 degrees. Out of a total of 156 patients, re-rupture was observed in 4 cases (3%) of 117 cases (75%) for which MRI was performed (with consent) between 3 and 6 months after surgery. Conclusion: UU repair surgery as arthroscopic repair of rotator cuff tear is a good repair method that shows excellent clinical results and a low re-rupture rate.