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Lv Z, Cui J, Zhang J, He L. Lifestyle factors and subacromial impingement syndrome of the shoulder: potential associations in finnish participants. BMC Musculoskelet Disord 2024; 25:220. [PMID: 38504237 PMCID: PMC10949643 DOI: 10.1186/s12891-024-07345-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Accepted: 03/07/2024] [Indexed: 03/21/2024] Open
Abstract
BACKGROUND Emerging evidence has indicated the associations between subacromial impingement syndrome (SIS) of shoulder and lifestyle factors. However, whether unhealthy lifestyle factors causally increase SIS risk is not determined. This study aims to evaluate whether lifestyle factors are the risk factors of SIS. METHODS A two-sample Mendelian randomization (MR) study was designed to evaluate the effect of 11 lifestyle factors on SIS risk. Causality was determined using the inverse-variance weighted method to calculate the odds ratio (OR) and establish a 95% confidence interval (CI). Weighted median method, MR-Egger method and MR-PRESSO method were conducted as sensitivity analysis. RESULTS Four lifestyle factors were identified causally associated with an increased risk of SIS using the IVW method: insomnia (OR: 1.66 95% CI 1.38, 2.00; P = 8.86 × 10- 8), short sleep duration (OR: 1.53 95% CI 1.14, 2.05: P = 0.0043), mobile phone usage (OR: 4.65, 95% CI 1.59, 13.64; P = 0.0051), and heavy manual or physical work (OR: 4.24, 95% CI 2.17, 8.26; P = 2.20 × 10- 5). Another causal but weak association was found between smoking initiation on SIS (OR: 1.17, 95% CI 1.01, 1.35; P = 3.50 × 10- 2). Alcohol, coffee consumption, physical activity, sedentary behavior, sleep duration and computer usage were not found to be causally associated with an increased risk of SIS. Sensitivity analyses indicated that the MR estimates were robust and no heterogeneity and pleiotropy were identified in these MR analyses. CONCLUSION Sleep habits and shoulder usage were identified as causal factors for SIS. This evidence supports the development of strategies aimed at improving sleep behaviors and optimizing shoulder usage patterns as effective measures to prevent SIS.
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Affiliation(s)
- Zhengtao Lv
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Jiarui Cui
- Clinical Innovation & Research Center (CIRC), Shenzhen Hospital, Southern Medical University, Shenzhen, 518100, China
| | - Jiaming Zhang
- Clinical Innovation & Research Center (CIRC), Shenzhen Hospital, Southern Medical University, Shenzhen, 518100, China
| | - Li He
- Department of Traumatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095#, Jie-Fang Avenue, Qiaokou District, Wuhan, 430030, China.
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Lewis C, Wahlström J, Mukka S, Liv P, Järvholm B, Jackson JA. Surgery for subacromial impingement syndrome and occupational biomechanical risk factors in a 16-year prospective study among male construction workers. Scand J Work Environ Health 2023; 49:156-163. [PMID: 36504288 PMCID: PMC10577012 DOI: 10.5271/sjweh.4075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Indexed: 12/24/2022] Open
Abstract
OBJECTIVE The aim of this study was to assess the association between occupational biomechanical exposures and the occurrence of surgical treatment for subacromial impingement syndrome (SIS). METHODS A cohort of 220 295 male constructions workers who participated in a national occupational health surveillance program (1971-1993) were examined prospectively over a 16-year follow-up period (2001-2016) for surgically treated SIS. Worker job title, smoking status, height, weight, and age were registered on health examination. Job titles were mapped to 21 occupational groups based on tasks and training. A job exposure matrix (JEM) was developed with exposure estimates for each occupational group. Surgical cases were determined through linkage with the Swedish national in- and outpatient registers. Poisson regression was used to assess the relative risks (RR) for each biomechanical exposure. RESULTS The total incidence rate of surgically treated SIS over the 16-year observation period was 201.1 cases per 100 000 person-years. Increased risk was evident for workers exposed to upper-extremity loading (push/pull/lift) (RR 1.45-2.30), high hand grip force (RR 1.47-2.23), using handheld tools (RR 1.52-2.09), frequent work with hands above shoulders (RR 1.62-2.11), static work (RR 1.77-2.26), and hand-arm vibration (RR 1.78-2.13). There was an increased risk for SIS surgery for all occupational groups (construction trades) compared with white-collar workers (RR 1.56-2.61). CONCLUSIONS Occupational upper-extremity load and posture exposures were associated with increased risk for surgical treatment of SIS, which underlines the need for reducing workplace exposures and early symptom detection in highly exposed occupational groups.
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Affiliation(s)
- Charlotte Lewis
- Department of Public Health and Clinical Medicine, Sustainable Health, SE-901 87 Umeå University, Sweden.
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Ahmad RG. Shoulder impingement: various risk factors for supraspinatus tendon tear: A case group study. Medicine (Baltimore) 2022; 101:e28575. [PMID: 35060519 PMCID: PMC8772690 DOI: 10.1097/md.0000000000028575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 12/22/2021] [Indexed: 01/05/2023] Open
Abstract
A total of 680 cases of monolateral shoulder pain and functional impairment were included, and Chi-Squared tests was incorporated to test for possible associations.No relation between impingement syndrome and potential risk factors was found, such as presence of down slopping (P = .083), presence of ossification acromiale (P = .102), presence of calcific tendinitis (P = .144), types of acromion (I [P = .600], II [P = .536], III [P = .633] and IV [P = .832]) and grade of acromioclavicular degenerative changes (mild [P = .077], moderate [P = .111], and severe [P = .700]). However, a significant relationship was uncovered between impingement syndrome and risk factors such as gender (X2 = 7.004, df = 1, P = .08) (where females were more prone), history of shoulder dislocation (X2 = 19.440, df = 1, P = .001), presence of supraspinatus tendon tear or tendinopathy (X2 = 69.344, df = 1, P = .001) and supraspinatus complete tear (X2 = 13.593, df = 1, P = .001). A significant relationship was found between the type of supraspinatus pathology and factors such as gender (female more prone) (X2 = 34.719, df = 3, P = .01), presence of down slopping (X2 = 57.765, df = 3, P = .01), history of shoulder dislocation (X2 = 148.880, df = 3, P = .001), type III of the acromion (X2 = 12.979, df = 3, P = .005), presence of acromioclavicular generative changes mild (X2 = 76.408, df = 3, P = .001) and moderate (X2 = 29.697, df = 3, P = .001), and acromiohumeral distance of ≤3 mm (X2 = 18.915, df = 3, P = .001), 3.1 to 6 mm (X2 = 13.212, df = 3, P = .004), and 9.1-12 mm (X2 = 15.066, df = 3, P = .002). Overall, the Magnetic Resonance Imaging results yielded high sensitivity for detecting full-thickness supraspinatus tears.Considering the findings, this study may help radiologists understand the salient risk factors and identify which factors are mainly responsible for supraspinatus tendon tears and the respective grade of tear (articular partial, bursal partial, complete, or tendinopathy).
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Xu D, Shi Y, Luo P, Wang W, Guo W, Lou W, Chen J. Influential factors of subacromial impingement syndrome after hook plate fixation for acromioclavicular joint dislocation: A retrospective study. Medicine (Baltimore) 2021; 100:e26333. [PMID: 34115049 PMCID: PMC8202590 DOI: 10.1097/md.0000000000026333] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 05/16/2021] [Indexed: 01/04/2023] Open
Abstract
Subacromial impingement syndrome (SIS) after hook plate fixation for acromioclavicular joint (AC) dislocation was the most common complication. However, the researches on its' influential factors were rare. The purpose of this study was to identify the risk factors by analyzing the influencing factors of postoperative SIS and minimize the incidence of SIS in clinical surgery.We retrospectively analyzed the prospectively collected data from 330 consecutive patients with AC joint dislocation between August 2014 and August 2017 at our institute. The SIS was presented as the dependent variable at the last follow-up when the internal fixation was removed. The independent variables included age, gender, body-mass index (BMI), smoking status, alcohol consumption, type of injury, Rockwood Classification, site of injury, operation time, injury-to-surgery, the distance between the hook body and the acromion (DBA), the depth of hook tip (DHT), the distance between the hook plate and the humeral head (DHH), the distance between the acromion and the humeral head (DAH), the hook plate angle (AHP) and acromial shape. Logistic regression analysis was performed to identify independent influential factors of SIS.A total of 312 cases were included and 18 cases were lost. The follow-up rate was 94.5%. In without SIS group, there were 225 cases (123 males and 102 females). In with SIS group, a total of 87 cases were included (56 males and 31 females). The incidence of SIS was 27.8%. DHT (OR = 9.385, 95% CI = 4.883 to 18.040, P < .001) and DBA (OR = 2.444, 95% CI = 1.591 to 3.755, P < .001) were the significant independent risk factor for SIS of AC dislocation treat with hook plate. DAH (OR = 0.597, 95% CI = 0.396 to 0.900, P = .014) and acromial shape with flat and straight (OR = 0.325, 95% CI = 0.135 to 0.785, P = .012) were also independent factors of SIS, but they were all protective.The SIS had a high incidence in fixation of clavicular hook plate for AC dislocation. DHT and DBA were two independent risk factors, DAH and acromial shape with flat and straight were two independent protective factors for SIS. In clinical surgery, we should avoid risk factors to reduce the incidence of SIS.
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Affiliation(s)
- Ding Xu
- Department of Orthopedic Trauma Surgery, Ningbo No.6 Hospital
- Department of Orthopedic Trauma Surgery, Shangyu people's Hospital
| | - Yulong Shi
- Department of Orthopedic Trauma Surgery, RWTH Aachen University, Germany
| | - Peng Luo
- Department of Orthopedic Trauma Surgery, The Second Affiliated Hospital and Yuying Children's hospital of Wenzhou Medical University, China
| | - Weikang Wang
- Department of Orthopedic Trauma Surgery, RWTH Aachen University, Germany
| | - Weijun Guo
- Department of Orthopedic Trauma Surgery, The Second Affiliated Hospital and Yuying Children's hospital of Wenzhou Medical University, China
| | - Weigang Lou
- Department of Orthopedic Trauma Surgery, Ningbo No.6 Hospital
| | - Jianming Chen
- Department of Orthopedic Trauma Surgery, Ningbo No.6 Hospital
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Clausen MB, Nielsen MF, Merrild MB, Hölmich P, Thorborg K. High incidence of lost workdays in patients with subacromial impingement syndrome. Dan Med J 2021; 68:A07200496. [PMID: 34060461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
INTRODUCTION Loss of workdays is the main societal cost related to shoulder disorders with nine lost workdays per six months on average. The most common shoulder disorder is subacromial impingement syndrome (SIS), but it remains unknown if SIS is also a leading cause of shoulder-related loss of worktime. We aimed to investigate the incidence of workdays lost due to SIS during the six months following a SIS diagnosis in specialised care. METHODS Among 157 consecutive patients diagnosed with SIS in secondary care, 129 (82%) completed a structured six-month follow-up interview. Job status, average working hours and sick leave due to SIS were recorded. Only patients holding a job (n = 58) and patients who lost their job due to SIS (n = 8) were considered to be at risk of losing workdays, leaving 66 patients in the at-risk group. The number of lost workhours due to SIS was calculated and normalised to full-time workdays, and incidences of lost workdays were estimated using Poisson regressions. RESULTS In total, 1,781 workdays were lost. The mean number of lost workdays per six months was 27 days (95% confidence interval (CI): 18-40) for patients at risk (n = 66), corresponding to 14 days on average (95% CI: 9-21 days) for the entire cohort (n = 129). A total of 33 patients were responsible for all loss of workdays. CONCLUSIONS We found that an average of 27 workdays (> 5 work weeks) were lost due to SIS during the first six months after the diagnosis in patients who were otherwise fit to work. This is three times higher than the nine days previously reported for shoulder problems in general, indicating that productivity loss in patients diagnosed with SIS is a major concern. FUNDING none. TRIAL REGISTRATION not relevant.
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Aceituno-Gómez J, García-Madero VM, Blázquez-Gamallo R, Harto-Martínez AM, Mohedano A, Viñuela A, Avendaño-Coy J, Gómez-Soriano J, Muñoz-González A, González-González J, Criado-Álvarez JJ. [Health-related quality of life in patients diagnosed with subacromial syndrome in the Talavera Integrated Area]. Rev Esp Salud Publica 2019; 93:e201910094. [PMID: 31621693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 09/13/2019] [Indexed: 06/10/2023] Open
Abstract
OBJECTIVE There is a high prevalence of subacromial syndrome among patients with shoulder pathology, where the pain and tendency to chronification are some of its most important characteristics. This is why it is necessary to objectively interact with the quality of life of the subject. The main goal was to determine if there are differences between subacromial patients and asymptomatic patients regarding quality of life. METHODS Transversal study carried out in the Talavera Integrated Area during the months of November 2016 to March2017. Participated a total of 92 subjects, 46 were symptomatic mating by age and sex with an asymptomatic sample and without joint pathology of the same size and health area. In both cases, the EQ-5D questionnaire was administered. The prevalence was calculated from the waiting list of traumatology physiotherapy in the year 2015. The SPSS statistical program was used, applying the T-test and the chi-square. RESULTS The EQ-5D questionnaire obtained a standardized mean of 0.70 in the subacromial syndrome and 0.85 in the asymptomatic population (P=0.0001). The prevalence of impingement subacromial within shoulder pathology was 39.19%. CONCLUSIONS Subacromial syndrome has a high prevalence within the shoulder pathology in the Rehabilitation Service and significantly interferes in the quality of life related to the health of the subject.
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Affiliation(s)
- Javier Aceituno-Gómez
- Gerencia de Atención Integrada de Talavera de la Reina. SESCAM. Talavera de la Reina. España
| | | | - Raquel Blázquez-Gamallo
- Gerencia de Atención Integrada de Talavera de la Reina. SESCAM. Talavera de la Reina. España
| | | | - Alicia Mohedano
- Facultad de Ciencias de la Salud. Universidad de Castilla La Mancha (UCLM). Talavera de la Reina. España
| | - Antonio Viñuela
- Facultad de Ciencias de la Salud. Universidad de Castilla La Mancha (UCLM). Talavera de la Reina. España
| | - Juan Avendaño-Coy
- Facultad de Fisioterapia y Enfermería. UCLM. Grupo de Investigación en Fisioterapia de Toledo. Toledo. España
| | - Julio Gómez-Soriano
- Facultad de Fisioterapia y Enfermería. UCLM. Grupo de Investigación en Fisioterapia de Toledo. Toledo. España
| | | | - Jaime González-González
- Gerencia de Atención Integrada de Talavera de la Reina. SESCAM. Talavera de la Reina. España
- Facultad de Ciencias de la Salud. Universidad de Castilla La Mancha (UCLM). Talavera de la Reina. España
| | - Juan José Criado-Álvarez
- Gerencia de Atención Integrada de Talavera de la Reina. SESCAM. Talavera de la Reina. España
- Facultad de Ciencias de la Salud. Universidad de Castilla La Mancha (UCLM). Talavera de la Reina. España
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Christiansen DH, Frost P, Frich LH, Falla D, Svendsen SW. The Use of Physiotherapy among Patients with Subacromial Impingement Syndrome: Impact of Sex, Socio-Demographic and Clinical Factors. PLoS One 2016; 11:e0151077. [PMID: 26954692 PMCID: PMC4783058 DOI: 10.1371/journal.pone.0151077] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 02/23/2016] [Indexed: 11/18/2022] Open
Abstract
Background Physiotherapy with exercises is generally recommended in the treatment of patients with subacromial impingement syndrome (SIS). Objective We aimed to investigate the use of physiotherapy in patients with SIS in Danish hospital settings as part of initial non-surgical treatment and after SIS-related surgery and to evaluate to which extent sex, socio-demographic and clinical factors predict the use of physiotherapy. Methods Using national health registers, we identified 57,311 patients who had a first hospital contact with a diagnosis of ICD-10, groups M75.1–75.9, 1 July 2007 to 30 June 2011. Records of physiotherapy were extracted within 52 weeks after first contact (or until surgery), and for surgically treated patients within 26 weeks after surgery. Predictors of the use of physiotherapy after first contact and after surgery were analysed as time-to-event. Results Within 52 weeks after first contact, 43% of the patients had physiotherapy and 30% underwent surgery. Within 26 weeks after surgery, 80% had a record of physiotherapy. After first contact and after surgery, exercise was part of physiotherapy in 65% and 84% of the patients, respectively. A public hospital contact, physiotherapy before hospital contact, administrative region, female sex, a diagnosis of other or unspecified disorders (M75.8-M75.9), and surgical procedure predicted higher use of physiotherapy. Low education level predicted slightly lower use of physiotherapy after first contact, but not after surgery. Conclusion In patients with SIS in Danish hospital settings, physiotherapy was more often used after surgery than as part of initial non-surgical treatment. The use of physiotherapy was less common among men than women, whereas unequal use of physiotherapy in relation to education level was not noticeable. The use of physiotherapy with exercises in initial non-surgical treatment was relatively limited.
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Affiliation(s)
- David Høyrup Christiansen
- Danish Ramazzini Centre, Department of Occupational Medicine, Regional Hospital West Jutland—University Research Clinic, Herning, Denmark
- * E-mail:
| | - Poul Frost
- Danish Ramazzini Centre, Department of Occupational Medicine, Aarhus Hospital, Aarhus University Hospital, Aarhus, Denmark
| | | | - Deborah Falla
- Center for Anesthesiology, Emergency and Intensive Care Medicine, University Hospital Göttingen, Göttingen, Germany
- Institute for Neurorehabilitation Systems, Bernstein Focus Neurotechnology (BFNT) Göttingen Bernstein Center for Computational Neuroscience (BCCN), University Medical Center Göttingen Georg-August University, Göttingen, Germany
| | - Susanne Wulff Svendsen
- Danish Ramazzini Centre, Department of Occupational Medicine, Regional Hospital West Jutland—University Research Clinic, Herning, Denmark
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Hsiao MS, Cameron KL, Tucker CJ, Benigni M, Blaine TA, Owens BD. Shoulder impingement in the United States military. J Shoulder Elbow Surg 2015; 24:1486-92. [PMID: 25865088 DOI: 10.1016/j.jse.2015.02.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 02/20/2015] [Accepted: 02/24/2015] [Indexed: 02/01/2023]
Abstract
BACKGROUND Little is known about the incidence and characteristics of primary, or external, shoulder impingement in an occupationally and physically active population. A longitudinal, prospective epidemiologic database was used to determine the incidence and risk factors for shoulder subacromial impingement in the United States (U.S.) military. Our hypothesis was that shoulder impingement is influenced by age, sex, race, military rank, and branch of service. METHODS The Defense Medical Epidemiology Database was queried for all shoulder impingement injuries using International Classification of Disease, Ninth Addition, Clinical Modification code 726.10 within a 10-year period from 1999 through 2008. An overall injury incidence was calculated, and a multivariate analysis performed among demographic groups. RESULTS In an at-risk population of 13,768,534 person-years, we identified 106,940 cases of shoulder impingement resulting in an incidence of 7.77/1000 person-years in the U.S. military. The incidence of shoulder impingement increased with age and was highest in the group aged ≥40 years (incidence rate ratio [IRR], 4.90; 95% confidence interval [CI], 4.61-5.21), was 9.5% higher among men (IRR, 1.10, 95% CI, 1.06-1.13), and compared with service members in the Navy, those in the Air Force, Army, and Marine Corps were associated with higher rates of shoulder impingement (IRR, 1.46 [95% CI, 1.42-1.50], 1.42 [95% CI, 1.39-1.46], and 1.31 [95% CI, 1.26-1.36], respectively). CONCLUSIONS The incidence of shoulder impingement among U.S. military personnel is 7.77/1000 person-years. An age of ≥40 years was a significant independent risk factor for injury.
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Affiliation(s)
- Mark S Hsiao
- Department of Orthopaedic Surgery & Rehabilitation, William Beaumont Army Medical Center/Texas Tech University Health Science Center, El Paso, TX, USA
| | - Kenneth L Cameron
- Department of Orthopaedic Surgery, John A. Feagin Jr. Sports Medicine Fellowship, Keller Army Hospital, West Point, NY, USA
| | - Christopher J Tucker
- Department of Orthopaedics and Rehabilitation, Fort Belvoir Community Hospital, Fort Belvoir, VA, USA
| | - Matthew Benigni
- US Special Operations Command, MacDill Air Force Base, Tampa, FL, USA
| | - Theodore A Blaine
- Department of Orthopaedics and Rehabilitation, Yale Medical School/Yale New Haven Hospital, New Haven, CT, USA
| | - Brett D Owens
- Department of Orthopaedic Surgery, John A. Feagin Jr. Sports Medicine Fellowship, Keller Army Hospital, West Point, NY, USA.
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Dorsher PT. Invited commentary on central hypersensitivity in patients with subacromial impingement syndrome. Arch Phys Med Rehabil 2012; 94:209-10; disscussion 211-2. [PMID: 22878229 DOI: 10.1016/j.apmr.2012.07.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Accepted: 07/21/2012] [Indexed: 11/18/2022]
Abstract
Pain pressure threshold (PPT) measurement by handheld algometer has been validated as a tool to identify and quantitate myofascial pain sites in an individual. The average of 3 readings at a given muscle site is used, so the standard error of measurement of these devices must be considered when determining whether PPT differences between muscle sites represent true changes. This commentary discusses this issue.
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Affiliation(s)
- Peter T Dorsher
- Department of Physical Medicine and Rehabilitation, Mayo Clinic, Jacksonville, FL, USA.
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Yu E, Cil A, Harmsen WS, Schleck C, Sperling JW, Cofield RH. Arthroscopy and the dramatic increase in frequency of anterior acromioplasty from 1980 to 2005: an epidemiologic study. Arthroscopy 2010; 26:S142-7. [PMID: 20691562 PMCID: PMC3074176 DOI: 10.1016/j.arthro.2010.02.029] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Revised: 02/15/2010] [Accepted: 02/19/2010] [Indexed: 02/02/2023]
Abstract
PURPOSE The purposes of this study was to better understand the utilization of anterior acromioplasty over time, in the absence of rotator cuff repair; to examine the relation to patient characteristics (age, sex) and types of rotator cuff pathology (inflammation or fibrosis, partial-thickness tearing, full-thickness tearing undergoing debridement); and to assess the utilization of arthroscopy in this procedure. METHODS Using the resources of the Rochester Epidemiology Project, cataloging medical records of residents in Olmsted County, Minnesota, we identified 246 patients who underwent anterior acromioplasty between 1980 and 2005. It has previously been shown that rarely does a resident of Olmsted County undergo an orthopaedic procedure at a facility outside the county. RESULTS The incidence of anterior acromioplasty increased over time (P < .001), with crude rates of 3.3 per 100,000 persons in 1980 to 1985 and 19.0 per 100,000 persons in 2000 to 2005. Sex, age, and types of rotator cuff pathology did not significantly change over the 26-year period. There was a dramatic shift from use of the open approach to the arthroscopic approach over this time period (P < .001) and a decrease in the concomitant performance of distal clavicle resection (P < .001). CONCLUSIONS The frequency of anterior acromioplasty has dramatically increased over time. Increasing knowledge about this syndrome, including better imaging, has facilitated patient treatment for a stable spectrum of rotator cuff pathology (inflammation or fibrosis, partial-thickness tearing, full-thickness tearing undergoing debridement), as has the application of endoscopic surgery. LEVEL OF EVIDENCE Level III, epidemiologic study.
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Affiliation(s)
- Elizabeth Yu
- Department of Orthopedic Surgery, Mayo Clinic, 200 First Street SW Rochester, MN 55905
| | - Akin Cil
- Department of Orthopedic Surgery, Mayo Clinic, 200 First Street SW Rochester, MN 55905
| | | | - Cathy Schleck
- Department of Biostatistics, Mayo Clinic, 200 First St., SW Rochester MN 55905
| | - John W. Sperling
- Department of Orthopedic Surgery, Mayo Clinic, 200 First Street SW Rochester, MN 55905
| | - Robert H. Cofield
- Department of Orthopedic Surgery, Mayo Clinic, 200 First Street SW Rochester, MN 55905
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Abstract
BACKGROUND Many studies have shown that musculoskeletal disorders (MSDs) have important economic and social consequences, including substantial costs and loss of productivity for industries. However, little is known about the impact of these conditions on sickness absence in industries. AIM To describe the sickness absence taken for MSDs of the upper limb (ULD) in a French company and to study their association with demographic and socioeconomic factors. METHODS Sickness absence from 2000 to 2004 (5543 episodes) was studied using data from the company's epidemiology registry and a questionnaire for each episode was completed by physicians. Incidence rates were calculated according to the gender, socioeconomic status and age. RESULTS The incidence rate of absence for ULD was six episodes per 1000 person-years. Rotator cuff syndrome and carpal tunnel syndrome were the most frequent diagnoses. Less frequent diagnoses, such as Guyon's canal syndrome, had longer sickness absence (55.3 days). Incidence was higher for women and blue-collar workers. Incidence also increased with age. CONCLUSIONS These results are consistent with other studies. Although absenteeism cannot be a surrogate for disease burden or incidence, it may be useful in the prevention of ULD, as it identifies the most disabling diagnoses and the working groups most at risk.
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Affiliation(s)
- Kayigan Wilson d'Almeida
- Institut National de la Santé et de la Recherche Médicale U687, Bâtiment 15-16, 16 Avenue Paul Vaillant Couturier, 94807 Villejuif Cedex, France.
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Finley MA, Rodgers MM. Prevalence and identification of shoulder pathology in athletic and nonathletic wheelchair users with shoulder pain: A pilot study. ACTA ACUST UNITED AC 2007; 41:395-402. [PMID: 15543457 DOI: 10.1682/jrrd.2003.02.0022] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Although many wheelchair users report shoulder pain, the prevalence of specific pathologies remains controversial. Rotator cuff impingement, glenohumeral instability, and biceps tendonitis have been stated as the most commonly found pathology. This study investigated the prevalence and identity of shoulder pathology in athletic and nonathletic manual wheelchair users (MWCUs). Fifty-two MWCUs (26 athletes, 26 nonathletes) completed a survey regarding the nature of their injury, sports involvement, history, and presence of current and/or past shoulder pathology. Subjects currently experiencing shoulder pain underwent a clinical examination of both shoulders. Analysis of variance (p <or=0.05) determined if differences existed between the groups in demographic variables, history of shoulder pain, and clinical evaluation measures in those with shoulder pain. Chi-squared (p <or=0.05) analysis verified the frequency distribution and association by groups and involved limbs for the clinical shoulder test measures. No difference was found in the incidence of shoulder pain, past or present, between athletes and nonathletes. Collectively, 61.5% (32/52) of the subjects reported experiencing shoulder pain, with 29% reporting shoulder pain at the present time. Years since onset of disability (p = 0.01) and duration of wheelchair use (p = 0.01) were found to be greater in individuals who reported a history of shoulder pain. Of the painful shoulders tested, 44% revealed clinical signs and symptoms of rotator cuff impingement, while 50% revealed signs of biceps tendonitis. Instability was found in 28% of the painful shoulders. These findings indicate that involvement in athletics neither increases nor decreases the risk of shoulder pain in the manual wheelchair population. Bicipital tendonitis with impingement syndrome was the most common pathology.
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Affiliation(s)
- Margaret A Finley
- University of Maryland School of Medicine, Department of Physical Therapy and Rehabilitation Science, 100 Penn Street, AHB, 115, Baltimore, MD 21201-1082, USA.
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13
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Abstract
Tears of the rotator cuff are one of the most common injuries to any tendon in the human body. Various theories and observations have since been made as to the origin of these tears. It is now commonly accepted to distinguish between"extrinsic" and"intrinsic" causes. Extrinsic describes an attrition which might have been caused by a subacromial bony conflict, while intrinsic changes originate within the tendon body itself due to age-related degenerative changes, giving rise to partial and later complete rupture of the tendon body. A better understanding of the underlying pathophysiological mechanism will make it easier for the attending orthopedic surgeon to decide whether a more conservative or operative course will have the best outcome for the situation given.
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Affiliation(s)
- J F Löhr
- Endoklinik, Holstenstrasse 2, 22767 Hamburg, Deutschland.
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14
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Abstract
The surgical treatment of rotator cuff lesions is still a controversial subject. We therefore decided to perform a study designed to yield an overview of the treatment modalities currently applied in Germany. A nationwide questionnaire survey was sent to 470 orthopaedic and trauma departments to ask about their surgical treatment of rotator cuff lesions: frequency of operative treatment, methods used in diagnosis and types of operative treatment; particular attention was paid to the application of minimally invasive techniques and to postoperative rehabilitation. The response rate was 55%. In all, 30,462 arthroscopic treatments were recorded for the year 2004, 9,094 of which were open or mini-open techniques and 2,528 were endoscopic reconstructions of the rotator cuff. Overall, we found that arthroscopic rotator cuff repair was performed in only 111 of the 257 departments from which responses were received and that the majority of surgeons preferred to use sutured and nonresorbable anchors. The postoperative treatment varies widely, from the full range of motion allowed within the first postoperative week to substantially more restrictive regimens. We see that the arthroscopic repair is still not the standard treatment for rotator cuff lesions in Germany. Further research is clearly still needed especially in the area of postoperative treatment.
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Affiliation(s)
- C Lüring
- Asklepios Klinikum Bad Abbach, Orthopädische Klinik für die Universität Regensburg, Kaiser-Karl-V.-Allee 3, 93077 Bad Abbach, Deutschland.
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15
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Abstract
BACKGROUND In literature there are only few data which describe the influence of occupation on the development of rotator cuff disease. METHODS In a retrospective study, 760 open rotator cuff repairs were analysed and related to the profession and occupational load. Exclusion criteria were traumatic tears and sports injuries. All male persons were statistically analysed and the data compared with occupational patterns of the region, obtained from the Federal Statistical State Office. RESULTS Rotator cuff repairs were performed in 472 males who had no evidence for a traumatic origin. After statistical analysis (p < 0.001) we found significantly more patients working in agriculture and forestry (6.38% versus 1.07% in Bavaria) and in the building industry (35.11% versus 13.40% in Bavaria). CONCLUSIONS Our data suggest that working exposure increases the risk or leads to the clinical manifestation of rotator cuff tears. Although a detailed analysis of individual physical exposure is not available yet, the statistical results indicate that rotator cuff tears must be taken into consideration as a result of ergonomic exposure.
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Affiliation(s)
- O Rolf
- Orthopädische Universitätsklinik König-Ludwig Haus, Würzburg, Germany
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16
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Nové-Josserand L, Walch G, Adeleine P, Courpron P. [Effect of age on the natural history of the shoulder: a clinical and radiological study in the elderly]. ACTA ACUST UNITED AC 2005; 91:508-14. [PMID: 16327686 DOI: 10.1016/s0035-1040(05)84440-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE OF THE STUDY Classically, the shoulder joint is thought to age more by its tendons than by its cartilages, the incidence of rotator cuff tears being considered to increase with age. The purpose of this work was to assess the natural history of the shoulder joint based on a clinical and radiological study of 200 patients aged 70 to 101 years. MATERIAL AND METHODS The cohort was composed of 48 men (34%) and 152 women (76%), aged 84.25 +/- 6.7 years. All patients underwent a physical examination and the Constant score was established. The radiographic examination included an AP view in neutral rotation of both shoulders. The Hamada classification was used to stage full thickness cuff tears. The glenohumeral compartment was analyzed to search for osteophyte formation and joint narrowing. RESULTS The subacromial height was greater than 6 mm, mean 9.89 +/- 2 mm, in 349 shoulders (87.25%), corresponding to stage I in the Hamada classification; it measured less than 6 mm, mean 3.08 +/- 1.7 mm in 51 shoulders (12.75%) in 38 subjects (19% of the total cohort). The Hamada classification for the other shoulders was stage II (n = 21 shoulders, 5.25%), and stage III (n = 16 shoulders, 4%), stage IV (n = 5, 1.25%) and stage V (n = 5, 1.25%). The Hamada stage could not be determined for four shoulders. There was a strong statistical correlation between the Constant score and Hamada stage. The glenohumeral space was normal in 288 shoulders (72%). Ninety-three shoulders (23.25%) in 62 patients (31%) presented humeral and/or inferior glenoid osteophytes without glenohumeral impingement and 19 shoulders (4.75% in 14 patients (7%) presented complete glenohumeral impingement. There was a significant correlation between the Constant score and severity of the glenohumeral degradation. The proportion of subacromial impincement increased significantly and regularly with degradation of the glenohumeral space (p < 104). For half of the shoulders, glenohumeral impingement was associated with subacromial impingement (eccentric osteoarthritis). DISCUSSION The results of this study confirm that the frequency of rotator cuff tears increases with age. One out of five patients aged 70-90 years presented subacromial impingement versus one out of three among patients aged over 90 years. Clinical tolerance of subacromial impingement or subacromial osteoarthritis is good. Glenohumeral impingement, associated or not with subacromial impingement, is poorly tolerated, the patients presenting shoulder pain and marked stiffness. CONCLUSION Our results demonstrate that the natural history of the shoulder does not exhibit a regular linear relationship with the Hamada radiological classification.
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Huber W, Hofstaetter JG, Hanslik-Schnabel B, Posch M, Wurnig C. Übersetzung und psychometrische Austestung des Rotator Cuff Quality-of-Life Measure (RC-QOL) für den Gebrauch im deutschen Sprachraum. Z Rheumatol 2005; 64:188-97. [PMID: 15868336 DOI: 10.1007/s00393-005-0646-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2004] [Accepted: 07/09/2004] [Indexed: 01/22/2023]
Abstract
The evaluation of quality of life is an established criterion for evaluation of therapeutic measures. Starting from the English-speaking area a great number of different patient-based outcomes measures were developed to specifically question disorders of the musculoskeletal system and the results of treatment. Because of the lack of a German measurement tool for patients with rotator cuff disease the translation and the psychometric testing following international guidelines of the 34-item, multidimensional, English Rotator Cuff Quality-of-Life Measure (RC-QOL) was undertaken. Reliability (test-retest reliability, internal consistency), validity, practicability and acceptance of the German version of the RC-QOL were tested by 102 patients with an impingement syndrome after translation and cross-culture adaptation of the English original questionnaire. In addition, the SF-36, the Constant and UCLA scores were evaluated. Between the evaluations there was no significant difference; the Pearson correlation coefficient was 0.89 for the test-retest reliability. The internal consistency showed a high homogeneity with a Cronbach Alpha-coefficient of 0.98. A Pearson correlation coefficient between 0.67-0.76 registered a high correlation with the physical subscales of the SF-36, the Constant and the UCLA scores. The mean time required for completing the RC-QOL was 12 minutes; mean time required for evaluation was 10 minutes. The questionnaire was incompletely answered by 16 patients (15.6%). A total of 120 items (3.5%) were left unanswered. After successful translation and psychometric testing of the German version of the Rotator Cuff Quality-of-Life Measure (RC-QOL) a multidimensional measurement tool for evaluating the quality of life of German-speaking patients with pathology of the rotator cuff is available.
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Affiliation(s)
- W Huber
- Universitätsklinik für Orthopädie, Wien, Austria.
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18
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Abstract
Patients with benign solitary enchondromas of the proximal humerus frequently present to the diagnosing physician with shoulder pain. Once the lesion is considered benign, emphasis can be placed on identifying the etiology for the pain. We reviewed our experience with these patients to identify the cause of the presenting pain. A retrospective review of clinical records and radiographic studies (radiographs, magnetic resonance images, and bone scans) was done for all patients presenting to an orthopaedic oncology unit with solitary enchondroma of the proximal humerus. Attention was focused on diagnostic evidence of additional disease in the shoulder. Fifty-seven patients (mean age, 53.6 years) met the criteria of the study and were included for evaluation. Of patients presenting with pain, 82% (47 of 57 patients) had findings seen on magnetic resonance imaging scans that correlated with the initial clinical diagnostic impression, suggesting that other disease was present that could explain the pain. Solitary enchondromas of the proximal humerus often are found incidentally during the initial evaluation of patients with shoulder pain. This study showed that additional treatable disease usually is present in patients with enchondromas of the proximal humerus.
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Affiliation(s)
- Jonathan C Levy
- Department of Orthopaedics and Rehabilitation, University of Miami School of Medicine, Miami, FL 33101, USA
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19
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Abstract
Osteophytes as a stigma for shoulder impingement syndrome and osteoarthritis of the acromioclavicular (AC) joint were studied on the acromions and AC joints in 346 skeletons (230 males; 116 females), ranging in age from 15-100 years. Osteophytes were found on 28.9% (200/692) of the acromions, mostly on the anteroinferior aspect (54%; 108/200). Of these 28.9%, 87% (174/200) were of the traction type and 13% (26/200) of the claw type. Regarding the clavicles, 11.6% (80/692) had osteophytes on the articular facets of their lateral ends; all were of the traction type. There were statistically more osteophytes on the right than on the left side of both acromion and clavicle (P < 0.05). The occurrence of osteophytes and increasing age were significantly correlated (r = 0.65, P < 0.001). No gender differences were noted in the frequency of osteophytes on acromions or clavicles. These data should prove beneficial to clinicians in planning a proper course of treatment for patients suffering from painful conditions of the shoulder.
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Affiliation(s)
- Pasuk Mahakkanukrauh
- Department of Anatomy, Faculty of Medicine, Chiangmai University, Chiangmai, Thailand.
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20
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Abstract
PURPOSE The study goal was to determine the incidence of the sublabral foramen and the Buford complex and to assess their association with superior labral pathology. TYPE OF STUDY Prospective case series. METHODS The surgical findings of 108 consecutive shoulder arthroscopies performed by the same surgeon were collected, along with patient demographics. During surgery, special attention was directed towards the anterosuperior labrum. The presence of a sublabral foramen or Buford complex was correlated with the morphology of the superior, middle, and inferior glenohumeral ligaments and the presence of superior labral pathology. RESULTS A total of 20 shoulders (18.5%) were found to have a sublabral foramen, and 7 (6.5%) had the Buford complex. The incidence of significant SLAP lesions was significantly higher in these 27 shoulders than in the rest of the study population (56% v 12%, P <.005). A thick, cord-like middle glenohumeral ligament was significantly associated with the presence of a sublabral foramen (P <.005). CONCLUSIONS The sublabral foramen and the Buford complex may be more common than previously thought. Furthermore, these variants of anterosuperior glenoid labrum anatomy appear to be associated with superior labral pathology. The presence of a cord-like middle glenohumeral ligament is associated with a sublabral foramen variant as well as the Buford complex.
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Affiliation(s)
- Omer A Ilahi
- Texas Arthroscopy and Sports Medicine Institute, Houston, Texas, USA.
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21
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Abstract
Shoulder problems are well-documented as an occupational illness. The incidence of occupational shoulder problems is increasing. A postal questionnaire survey was conducted to see if otolaryngologists are more susceptible to shoulder impingement syndrome because of their occupation. Endocrinologists were used as the control group. Among 556 questionnaires sent to otolaryngologists, 367 (64.6%) responses were returned compared with 210 questionnaires sent to endocrinologists, of which 138 (65.7%) responses were returned. A total of 88 (24.0%) of the otolaryngologists had suffered from impingement syndrome compared with 15 (10.9%) of the endocrinologists, which was significantly different. Of those with impingement syndrome, more endocrinologists gave a history of injury or overuse compared with otolaryngologists. There must be another factor, leading to increased incidence of impingement syndrome, which may be because of the continuous flexion, and abduction of their shoulders during examination and operating on patients.
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Affiliation(s)
- R K Mal
- Department of Otorhinolaryngology/Head and Neck Surgery, Southmead Hospital, Bristol, UK
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22
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Abstract
The incidence of primary and secondary bicipital tendinitis remains unknown. In our prospective study, 200 consecutive shoulders underwent arthroscopic subacromial decompression for impingement syndrome. A biceps tenodesis was performed in 80 shoulders (40%) featuring macroscopic degeneration of the long head of the biceps; rotator cuff tears were apparent in 91% of these shoulders, the mean patient age being 55 years. In each of 120 shoulders (60%), an extraarticular tenosynovectomy was performed, and histopathologic studies revealed chronic inflammation in 63% and fibrotic degeneration in 13% of the specimens; rotator cuff tears were evident in 70% (23% full thickness) of these cases, the mean patient age being 47 years. In addition, when glenohumeral arthritis was present, it was uniformly associated with pathologic biceps tenosynovium. In summary, the high incidence of chronic inflammation of the long head of the biceps in shoulders with benign-appearing intraarticular portions viewed arthroscopically is significant, and long head of the biceps disease should also be considered in patients with painful rotator cuff disease and arthritic shoulder conditions.
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Affiliation(s)
- A M Murthi
- Department of Orthopaedic Surgery, George Washington University Medical Center, Washington, DC, USA
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23
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Abstract
OBJECTIVES To analyse the risk of shoulder impingement syndrome relative to shoulder intensive work. METHODS A cross sectional study of a historical cohort of 1591 workers employed between 1986 and 1993 at a slaughterhouse or a chemical factory. Workers not doing tasks in slaughtering or meat processing constituted the reference group. Intensity of shoulder work in meat processing tasks was assessed by video based observations. Information on shoulder disorders was collected by questionnaire and by physical examinations. Impingement syndrome was diagnosed when shoulder symptoms had been present for at least 3 months during the past year and there were signs of subacromial impingement in the corresponding shoulder at physical examination. Shoulder function was assessed at the same occasion with the Constant scoring technique. Prevalence of shoulder impingement syndrome was analysed according to job title and cumulative exposure. RESULTS Prevalence ratio for shoulder impingement syndrome was 5.27 (95% confidence interval (95% CI), 2.09 to 12.26) among currently working and 7.90 (95% CI, 2.94 to 21.18) among former slaughterhouse workers. Transformed model based prevalence ratios according to years in slaughterhouse work showed an overall association between cumulative exposure and risk for shoulder impingement syndrome. CONCLUSIONS This study supports the hypothesis that shoulder intensive work is a risk factor for impingement syndrome of the shoulder. Despite the historical cohort design healthy worker selection may have influenced the exposure-response relation found.
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Affiliation(s)
- P Frost
- Department of Occupational Medicine, Aarhus University Hospital, Denmark
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Huang LF, Rubin DA, Britton CA. Greater tuberosity changes as revealed by radiography: lack of clinical usefulness in patients with rotator cuff disease. AJR Am J Roentgenol 1999; 172:1381-8. [PMID: 10227521 DOI: 10.2214/ajr.172.5.10227521] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE Studies linking greater tuberosity findings on radiographs with rotator cuff disease have largely been uncontrolled and biased toward more severe disease. We correlated greater tuberosity changes seen on radiography with rotator cuff disease seen on MR images in a broadly symptomatic patient population. MATERIALS AND METHODS Both radiography and MR imaging were performed in 108 shoulders. Unaware of the MR imaging findings, three radiologists independently reviewed the radiographs for cortical thickening, subcortical sclerosis, and cystlike lesions in the humeral greater tuberosity. Interobserver agreement was analyzed using kappa statistics. We correlated the radiographic findings with MR imaging evidence of rotator cuff tears and tendonopathy. The positive predictive value of each finding for rotator cuff disease was also calculated. RESULTS Interobserver agreement for the three radiographic findings was poor to fair: Kappa values ranged from .06 to .41. Cortical thickening and subcortical sclerosis were not seen more frequently in shoulders with rotator cuff disease than in normal shoulders. Cystlike lesions were more prevalent in shoulders with rotator cuff disease, but the association reached statistical significance (p < .05) for one observer only. Positive predictive values for each finding were low (14-48% for predicting full-thickness rotator cuff tears). CONCLUSION Cortical thickening of the greater tuberosity and subcortical sclerosis are not associated with rotator cuff disease. For some observers, identifying cystlike lesions is associated with rotator cuff disease, but the clinical usefulness of the observation is limited by high interobserver variability and poor positive predictive value.
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Affiliation(s)
- L F Huang
- Department of Radiology, University of Pittsburgh Medical Center, PA 15213, USA
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25
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Abstract
The SF-36 Health Survey is a patient self-administered general health status evaluation designed to measure the impact of disease on an individual's perception of his or her health. Five hundred forty-four patients with five common shoulder conditions (anterior glenohumeral instability (149 patients), complete reparable rotator cuff tear (111 patients), adhesive capsulitis (100 patients), glenohumeral osteoarthritis (67 patients), and impingement (117 patients)) completed the SF-36 Health Survey before undergoing treatment. When compared with U.S. general population norms, the patients with each of these shoulder conditions had statistically significant decreases in their health for Physical Functioning, Role-Physical, Bodily Pain, Social Functioning, Role-Emotional, and the Physical Component Summary as measured by the SF-36 Health Survey. Comparison with published data demonstrated that these shoulder conditions rank in severity (in terms of affecting a patient's perception of his or her general health) with five major medical conditions (hypertension, congestive heart failure, acute myocardial infarction, diabetes mellitus, and clinical depression). The data presented in this study should serve as a baseline to document the impact of shoulder musculoskeletal conditions and possibly to allow comparison among various methods of operative and nonoperative treatment.
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Affiliation(s)
- G M Gartsman
- Center for Musculoskeletal Research and Outcomes Studies, Texas Orthopedic Hospital, Houston 77030, USA
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