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      The pathophysiology associated with primary (idiopathic) frozen shoulder: A systematic review

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          Abstract

          Background

          Frozen shoulder is a common yet poorly understood musculoskeletal condition, which for many, is associated with substantial and protracted morbidity. Understanding the pathology associated with this condition may help to improve management. To date this has not been presented in a systematic fashion. As such, the aim of this review was to summarise the pathological changes associated with this primary frozen shoulder.

          Methods

          Databases: Medline, Embase, CINAHL, AMED, BNI and the Cochrane Library, were searched from inception to 2nd May, 2014. To be included participants must not have undergone any prior intervention. Two reviewers independently conducted the; searches, screening, data extraction and assessment of Risk of Bias using the Cochrane Risk of Bias Assessment Tool for non-Randomised Studies of Interventions (ACROBAT-NRSI). Only English language publications reporting findings in humans were included. The findings were summarised in narrative format.

          Results

          Thirteen observational studies (involving 417 shoulders) were included in the review. Eight studies reported magnetic resonance imaging or arthrography findings and 5 recorded histological findings. When reported mean ages of the participants ranged from 40.0 to 59.8 years. Duration of symptoms ranged from 0 to 30 months. The majority of studies ( n = 7) were assessed to be of moderate risk of bias, two studies at high risk and the remaining four were rated as low risk of bias. Study characteristics were poorly reported and there was widespread variety observed between studies in respect of data collection methods and inclusion criteria employed. Pathological changes in the anterior shoulder joint capsule and related structures were commonly reported. Imaging identified pathological changes occurring in the coracohumeral ligament, axillary fold and rotator interval. Obliteration of the subcoracoid fat triangle also appeared to be pathognomonic. Histological studies were inconclusive but suggested that immune, inflammatory and fibrotic changes where associated with primary frozen shoulder.

          Conclusions

          This systematic review presents a summary of what is currently known about the tissue pathophysiology of primary frozen shoulder. Further studies that use standardised inclusion and exclusion criteria and investigate changes in naïve tissue at different stages of the condition are required.

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          Most cited references 56

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          Current review of adhesive capsulitis.

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            Frozen shoulder. A long-term follow-up.

            Sixty-two patients (sixty-eight shoulders) who had been treated non-operatively for idiopathic frozen shoulder were evaluated subjectively and objectively at two years and two months to eleven years and nine months of follow-up (average, seven years). Thirty-one (50 per cent) of these patients still had either mild pain or stiffness of the shoulder, or both. The range of motion averaged 161 degrees of forward flexion, 157 degrees of forward elevation, 149 degrees of abduction, 65 degrees of external rotation, and internal rotation to the level of the fifth thoracic spinous process. Thirty-seven (60 per cent) of the sixty-two patients still demonstrated some restriction of motion as compared with study-generated control values (calculated as the average motion, in each plane, for the thirty-seven unaffected shoulders of the patients who had unilateral disease). Ten patients had restriction of forward flexion; eight, of forward elevation; seventeen, of abduction; twenty-nine, of external rotation; and ten, of internal rotation. However, when the motion of each affected shoulder of thirty-seven patients who had unilateral involvement was compared with that of the unaffected contralateral shoulder, eleven (30 per cent) demonstrated some restriction. None of these patients had restriction of forward flexion; two had restriction of forward elevation; two, of abduction; seven, of external rotation; and seven, of internal rotation. The patients who had substantial restriction in three planes or more were thirteen times more likely to be men (p greater than 0.05). Marked restriction, when it was present, was most commonly in external rotation. Only seven patients (11 per cent) reported mild functional limitation.(ABSTRACT TRUNCATED AT 250 WORDS)
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              Frozen shoulder: a consensus definition.

              Frozen shoulder (FS) is a common diagnosis treated by orthopaedic surgeons and other physicians caring for musculoskeletal problems. However, there is no standard definition and classification for this common condition.
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                Author and article information

                Contributors
                northoverv@hotmail.com
                hlbrown@hotmail.co.uk
                c.j.minnslowe@herts.ac.uk
                jeremy.lewis@LondonShoulderClinic.com
                Journal
                BMC Musculoskelet Disord
                BMC Musculoskelet Disord
                BMC Musculoskeletal Disorders
                BioMed Central (London )
                1471-2474
                15 August 2016
                15 August 2016
                2016
                : 17
                Affiliations
                [1 ]Central North West London NHS Foundation Trust, London, UK
                [2 ]Royal National Orthopaedic Hospital NHS Trust, London, UK
                [3 ]Department of Allied Health Professions and Midwifery, School of Health and Social Work, University of Hertfordshire, Hatfield, UK
                [4 ]Central London Community Healthcare NHS Trust, London, UK
                Article
                1190
                10.1186/s12891-016-1190-9
                4986375
                27527912
                © The Author(s). 2016

                Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License ( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

                Funding
                Funded by: The Health Foundation
                Award ID: 7370
                Award Recipient :
                Categories
                Research Article
                Custom metadata
                © The Author(s) 2016

                Orthopedics

                histology, imaging, systematic review, adhesive capsulitis, frozen shoulder

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