• Clinics in Shoulder and Elbow
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• 제22권3호
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• pp.139-145
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• 2019

Background: The present study was undertaken to evaluate the relationship between location of the rotator cuff tear and shape of the subacromial spur. Methods: Totally, 80 consecutive patients who underwent arthroscopic repair for partial thickness rotator cuff tear were enrolled for the study. Bigliani's type of the acromion, type of subacromial spur, and location of partial thickness tear of the rotator cuff were evaluated using plain X-ray and magnetic resonance imaging. We then compared the groups of no spur with spur, and heel with traction spur. Results: Of the 80 cases, 25 cases comprised the no spur group, and 55 cases comprised the spur group. There was a significant difference in type of tear (p=0.0004) between these two groups. Bursal side tears were significantly greater (odds ratio=6.000, p=0.0007) in the spur group. Subjects belonging to the spur group were further divided into heel (38 cases) and traction spur (17 cases). Comparing these two groups revealed significant differences only in the type of tear (p=0.0001). Furthermore, the heel spur had significantly greater bursal side tear (odds ratio=29.521, p=0.0005) as compared to traction spur. Conclusions: The heel spur is more associated to bursal side tear than the traction spur, whereas the traction spur associates greater to the articular side tear.

• Journal of Korean Neurosurgical Society
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• 제46권4호
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• pp.328-332
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• 2009

Objective : The purpose of this study was to establish new fusion criteria to complement existing Brantigan-Steffee fusion criteria. The primary purpose of intervertebral cage placement is to create a proper biomechanical environment through successful fusion. The existence of a traction spur is an essential predictable radiologic factor which shows that there is instability of a fusion segment. We studied the relationship between the existence of a traction spur and fusion after a posterior lumbar interbody fusion (PLIF) procedure. Methods : This study was conducted using retrospective radiological findings from patients who underwent a PLIF procedure with the use of a cage without posterior fixation between 1993 and 1997 at a single institution. We enrolled 183 patients who were followed for a minimum of five years after the procedure, and used the Brantigan-Steffee classification to confirm the fusion. These criteria include a denser and more mature bone fusion area than originally achieved during surgery, no interspace between the cage and the vertebral body, and mature bony trabeculae bridging the fusion area. We also confirmed the existence of traction spurs on fusion segments and non-fusion segments. Results : The PLIF procedure was done on a total of 251 segments in 183 patients (71 men and 112 women). The average follow-up period was $80.4{\pm}12.7$ months. The mean age at the time of surgery was $48.3{\pm}11.3$ years (range, 25 to 84 years). Among the 251 segments, 213 segments (84.9%) were fused after five years. The remaining 38 segments (15.1%) were not fused. An analysis of the 38 segments that were not fused found traction spur formation in 20 of those segments (52.6%). No segments had traction spur formation with fusion. Conclusion : A new parameter should be added to the fusion criteria. These criteria should be referred to as 'no traction spur formation' and should be used to confirm fusion after a PLIF procedure.

• Structural Engineering and Mechanics
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• 제58권3호
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• pp.443-458
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• 2016

In this paper, we propose a method for taking into account uncertainties based on the projection on polynomial chaos. Due to the manufacturing and assembly errors, uncertainties in material and geometric properties, the system parameters including assembly defect, damping coefficients, bending stiffness and traction-compression stiffness are uncertain. The proposed method is used to determine the dynamic response of a one-stage spur gear system with uncertainty associated to gear system parameters. An analysis of the effect of these parameters on the one stage gear system dynamic behavior is then treated. The simulation results are obtained by the polynomial chaos method for dynamic analysis under uncertainty. The proposed method is an efficient probabilistic tool for uncertainty propagation. The polynomial chaos results are compared with Monte Carlo simulations.

• 대한관절경학회지
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• 제10권2호
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• pp.178-183
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• 2006

목적: 주관절의 퇴행성관절염에 대해 측와위에서 견인 후 관절경을 이용한 수술적 치료를 시행하고 그 결과와 술식의 유용성을 보고하고자 한다. 대상 및 방법: 12개월 이상 추시가 가능하였던 주관절의 퇴행성관절염 21례를 대상으로 하였다. 남자가 15례 여자가 6례였으며 평균 연령은 47세, 우세지가 14례였다. 모든 례에서 수술은 전신 마취하에 측와위에서 10파운드의 견인 상태로 관절내 활액막염, 골성 유리체, 관절의 전방 및 후방의 골극을 제거 하였다. 수술 후 최대 신전 상태에서 고정을 하였으며 2일부터 CPM을 이용한 운동을 시행하였다. 결과: 수술전 관절 운동 범위는 평균 $30{\sim}115$도였으며 수술 후 평균 $5{\sim}130$도로, 신전과 굴곡 각각 25도 16도, 전체적으로 41도 증가하였다. 통증에 대한 VAS상 7.5점에서 2.3점으로 감소, 기능 만족도는 1.8에서 9.0으로 증가하였다. 합병증은 2례로 1례는 척골 신경의 이상 감각증상이 있었으나 보존적 치료에 소실되었고, 1례는 수포가 형성되었으나 치유되었다. 결론: 주관절 관절경 수술시 측와위에서의 견인은 넓은 시야 확보에 도움을 주었다. 간단한 견인 방법으로 주관절의 퇴행성 관절염에 대해 관절경 수술을 시행한 바 통증의 의 해결과 관절 운동 범위 회복에 있어 우수한 결과를 얻을 수 있었다.