Technique for Margin Convergence in Rotator Cuff Repair

The purpose of the present study is to describe the technique of margin convergence for U-shaped rotator cuff tears and report the clinical outcomes and ultrasonography with a minimum of 2 years follow-up. Three hundred eleven patients with a rotator cuff tear were prospectively enrolled in a registry at one institution. Inclusion criteria included any patient undergoing arthroscopic margin convergence for a rotator cuff tear. Exclusion criteria included open or mini-open rotator cuff repairs or suture anchor fixation to the cuff insertion without margin convergence. The outcome measurements included physical examination, manual muscle testing, the American Shoulder and Elbow Surgeons (ASES) score, and ultrasonography. Nineteen patients met the study criteria and 13 were available for 2-year follow-up (68.4%). The mean age of this cohort was 62.2 ± 7.5 years with a mean pre-operative rotator cuff tear size of 4.0 ± 1.6 cm. The ASES score increased significantly from 50.0 ± 17.7 before surgery to 83.3 ± 19.5 at 2 years (P = 0.01). The active forward elevation also improved from 156.2 ± 11.9° before surgery to 168.0 ± 12.1 at 2 years (P = 0.03). The active external rotation 54.4 ± 14.5 at baseline and improved to 57.1 ± 19.1 at 2 years (P = 0.04). The strength also increased significantly from 6.7 ± 6.4 to 10.6 ± 4.9 lb at 1 year (P = 0.048). The post-operative ultrasound demonstrated that 46.2% of rotator cuff tears were healed at 2 years. In conclusion, margin convergence is a useful technique for U-shaped tears that are difficult to mobilize.     

关节镜辅助小切口治疗肩袖损伤

目的探讨关节镜辅助小切口治疗肩袖损伤的方法和疗效。方法 2008年3月~2011年12月采用关节镜辅助小切口治疗肩袖损伤22例,包括肩袖全层破裂16例,关节囊侧部分损伤4例,其中2例转化为肩袖全层破裂,按全层破裂处理,另2例浅层部分损伤和2例滑囊侧部分损伤仅行关节镜下清创。肩袖全层破裂在关节镜引导下准确定位,辅助小切口行彻底肩峰下减压,双排锚钉修复全层损伤肩袖。合并SLAP损伤7例。结果本组除1例肩袖损伤合并Ⅱ型SLAP损伤患者行双固定螺钉镜下修复手术时间为120 min外,其余21例手术时间平均62(51~70)min,其中行肩峰成形及肩袖修复时间平均17(12~20)min。辅助小切口平均2.8(2~3.5)cm。未出现神经损伤及肢体明显肿胀、液体渗漏等情况。术后随访平均13.2(10~18)个月。术后10月随访:ASES评分平均(91.0±12.5)分,较术前(57.2±9.6)分显著提高(P<0.05),其中优12例,良7例,可3例,优良率为86.4%;UCLA评分平均(33.2±3.5)分,较术前(12.9±3.8)分显著提高(P<0.05),其中优9例,良11例,可2例,优良率为90.9%。结论关节镜辅助小切口治疗肩袖损伤具有诊断全面、准确、微创、康复快的优点,临床治疗效果可靠。     

A Spectral Analysis of Rotator Cuff Musculature Electromyographic Activity: Surface and Indwelling

Electromyography (EMG) of the shoulder girdle is commonly performed; however, EMG spectral properties of shoulder muscles have not been clearly defined. The purpose of this study was to determine the maximum power frequency, Nyquist rate, and minimum sampling rate for indwelling and surface EMG of the normal shoulder girdle musculature. EMG signals were recorded using indwelling electrodes for the rotator cuff muscles and surface electrodes for ten additional shoulder muscles in ten healthy volunteers. A fast Fourier transform was performed on the raw EMG signal collected during maximal isometric contractions to derive the power spectral density. The 95% power frequency was calculated during the ramp and plateau subphase of each contraction. Data were analyzed with analysis of variance (ANOVA) and paired t tests. Indwelling EMG signals had more than twice the frequency content of surface EMG signals (p < .001). Mean 95% power frequencies ranged from 495 to 560 Hz for indwelling electrodes and from 152 to 260 Hz for surface electrodes. Significant differences in the mean 95% power frequencies existed among muscles monitored with surface electrodes (p = .002), but not among muscles monitored with indwelling electrodes (p = .961). No significant differences in the 95% power frequencies existed among contraction subphases for any of the muscle–electrode combinations. Maximum Nyquist rate was 893 Hz for surface electrodes and 1,764 Hz for indwelling electrodes. Our results suggest that when recording EMG of shoulder muscles, the minimum sampling frequency is 1,340 Hz for surface electrodes and 2,650 Hz for indwelling electrodes. The minimum sampling recommendations are higher than the 1,000 Hz reported in many studies involving EMG of the shoulder.     

肩峰撞击征合并肩袖损伤的关节镜下治疗

目的分析关节镜下肩峰减压成形术及肩袖修复的临床效果。方法自2005年初始,我院对11例肩峰撞击征并肩袖损伤行关节镜下肩峰减压成形术,部分行肩袖修复术,其中男5例,女6例,年龄21～57岁,平均40岁,8例无外伤史,3例有外伤史。患者均有肩关节疼痛、肌肉萎缩、活动受限、上举困难、疼痛反射弧阳性、撞击注射试验阳性,Neer征阳性;5例有患侧卧位痛。X线提示肱骨大结节骨赘9例和肩峰骨刺2例,A—H间隙距离变小,小于1．0cm8例、小于0．5cm3例。MRI扫描均示肩袖结构T1为强信号,如关节积液T2相强信号。关节镜检查可见肩袖大撕裂（30～50mm）4例,中撕裂（10～30mm）5例,小撕裂（小于10mm）2例。行关节镜下肩峰下减压成形术,其中8例行缝合锚钉肩袖修复术。分别在术前及最终随访时采用美国肩肘外科医师（American Shoulder and Elbow Surgeons,ASES）和Constant—Murley评分进行功能评估。结果术后随访22．5个月（13～34个月）。患者手术前平均ASES评分为62．4分（47～76分）,VAS评分平均为5．8分（3～8分）,Constant—Murley评分为66．7分（42～79分）,平均外展35．5°（30°～50°）,平均外旋为28．4°（0°～45°）;终末随访时平均ASES评分为94．6分（79～100分）,其中VAS评分为0．6分（0～2分）,Constant—Murley评分为93．6分（77～100分）,肩关节外展160°（80°～180°）,平均外旋30．2°（20°～55°）。8例患者冈上、下肌萎缩恢复,ASES评分优良率为81．8％,Constant—Murley评分优良率为90．9％。术后各项评分均存在显著性差异（ASES：P〈0．001,t一12．324;VAS：P〈0．001,t=14．765;外展：P〈0．001,t=15．236;外旋：P〈0．01,t=7．967;Constant—Murley：P〈0.001,t=16．647）。结论a）肩峰撞击征、肩袖损伤是关节镜手术的适应证;b）对肩袖单纯修复是不够的,必须同时解决撞击因素;c）不宜将肩峰切除过多,以免发生骨折;d）尽管镜下手术技术难度较大,但镜下视野广、创伤小、术后及早进行功能锻炼,功能可以得到很好恢复,故镜下进行肩袖损伤、肩峰成形等手术应值得提倡。     

中老年原发性冻结肩及肩袖钙化症的肩关节镜治疗

目的探讨中老年原发性冻结肩及肩袖钙化症的肩关节镜手术技巧与疗效。方法对非手术治疗无效的15例原发性冻结肩行肩关节镜下关节囊松解,4例合并肩袖钙化症,均行钙化灶清除及肩峰成形术。术前、术后采用ASES、VAS评分法和Constant肩关节功能评分法评估。结果术后平均随访27.3个月。术后疼痛程度及功能评分均有显著提高,肩关节活动度亦有较明显改善(P<0.01)。结论中老年原发性冻结肩及肩袖钙化症的肩关节镜治疗是一种损伤小、恢复快,安全有效的方法。     

The factor validity of the Western Ontario Rotator Cuff Index

Background  

The Western Ontario Rotator Cuff Index (WORC) is a self-report questionnaire developed specifically to evaluate disability in persons with pathology of the rotator cuff of the shoulder. The authors created items in 5 categories based on a model of quality of life, but never validated this structure. The purpose of this study was to examine the validity of the original 5-domain model of the WORC by performing factor analysis.     

Subacromial Injection Improves Deltoid Firing in Subjects with Large Rotator Cuff Tears

Previous studies demonstrate that scapulohumeral mechanics improve after subacromial injection. However, it is unclear how injection affects muscle firing. Forty-one subjects with two-tendon rotator cuff tears and 23 volunteer subjects with normal rotator cuffs documented by ultrasonography were examined. Electromyographic activity from 12 muscles was collected during ten functional tasks. Nine symptomatic subjects with rotator cuff tears underwent subacromial injection of anesthetic and underwent repeat electromyographic examination. Subjects with rotator cuff tears demonstrate global electromyographic differences when compared to normal controls. Asymptomatic subjects with rotator cuff tears had significantly increased anterior deltoid firing when compared to symptomatic counterparts during forward shoulder elevation. After subacromial injection, symptomatic subjects demonstrate increased anterior deltoid firing. Previous in vitro and in vivo studies have suggested that pain leads to deltoid inhibition and that subacromial injection leads to improved deltoid firing and, subsequently, improved shoulder function. This study provides direct evidence that subacromial injection improves deltoid firing in symptomatic subjects with rotator cuff tears. These findings reinforce the concept that deltoid inhibition resulting from pain is an important component of the motor disability associated with rotator cuff tears.     

Resection of the Ackomion in the Treatment of Persistent Rotator Cuff Syndrome of the shoulder

Partial or complete excision of the acromion was performed in 25 patients (29 shoulders) with long-standing pain in the shoulder typical of rotator cuff syndrome. There was no verified history of trauma in nine cases (13 shoulders), while injury was the cause of pain in 16 patients (16 shoulders). In nine shoulders there was a small and in two a large rupture of the rotator cuff. Twelve of the 13 non-traumatic shoulders became painless postoperatively and the pain was relieved in one. In the 16 traumatic shoulders the relief of pain was complete in six, partial in nine, and one remained unchanged. The condition was not aggravated in any of the cases. Mobility increased postoperatively in four cases and was in no case decreased by the operation. In this series the results were as favourable after partial as after complete excision of the acromion. Excision of the acromion alone or excision in combination with other procedures appears to be a promising method of treatment of patients with long-standing rotator cuff syndrome.