Publications by authors named "Mikkel B Clausen"

Purpose: Subacromial Pain Syndrome (SAPS) is a common persistent pain condition. Exercise-based care is first-line recommendation, but an insufficient exercise dose hampers effectiveness. This study explores individual and contextual barriers and facilitators for delivery of and adherence to exercise-based care in people with SAPS.

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Article Synopsis
  • Subacromial pain syndrome (SAPS) is a leading cause of shoulder pain, requiring a better understanding of patient preferences to select appropriate treatment options.
  • The study involved a systematic review of existing research and interviews with patients and clinicians to identify key treatment characteristics and preferences related to SAPS.
  • A total of 39 treatment attributes were established, highlighting a gap between existing literature and firsthand patient insights, which can guide personalized treatment and shared decision-making in healthcare.
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Background: Osgood-Schlatter is the most frequent growth-related injury affecting about 10% of physically active adolescents. It can cause long-term pain and limitations in sports and physical activity, with potential sequela well into adulthood. The management of Osgood-Schlatter is very heterogeneous.

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Objective: To evaluate the feasibility of a mobile health-supported intervention in patients with cardiovascular diseases after completion of a cardiac rehabilitation programme.

Methods: The feasibility study was performed in two hospitals and one municipality in Region Zealand, Denmark. Eligible participants were ≥18 years old, participated in a supervised cardiac rehabilitation programme, had access to a mobile phone, and could walk 3 m independently.

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Introduction: Digital body mapping can be used to document and quantify the area and location (distribution) of pain and discomfort and support assessment, monitoring, and treatment in clinical populations. This study determines the test-retest reliability of drawings detailing pain and pins and needles using digital body charts and their relationship to pain intensity and patient-reported shoulder function.

Methods: Sixty-two participants with shoulder disorder completed pain and pins and needles drawings with test-retest interval of 30 minutes.

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Background: Acute lateral ankle sprains (LAS) account for 4-5% of all Emergency Department (ED) visits. Few patients receive the recommended care of exercise rehabilitation. A simple solution is an exercise app for mobile devices, which can deliver tailored and real-time adaptive exercise programs.

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Objective: The primary aim was to investigate the effectiveness of adding more resistance exercise to usual care on pain mechanisms (including temporal summation, conditioned pain modulation (CPM) and local pain sensitivity) and pain catastrophising in people with subacromial impingement at 16 weeks follow-up. Second, to investigate the modifying effect of pain mechanisms and pain catastrophising on the interventions' effectiveness in improving shoulder strength and disability METHODS: 200 consecutive patients were randomly allocated to usual exercise-based care or the same plus additional elastic band exercise to increase total exercise dose. Completed add-on exercise dose was captured using an elastic band sensor.

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Introduction: There is no recognised terminology, nor diagnostic criteria, for patients with subacromial pain syndrome (SAPS). This is likely to cause heterogeneity across patient populations. This could be a driver of misconceptions and misinterpretations of scientific results.

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Background: Differences in shoulder-disability among common shoulder-disorders in orthopaedic specialist care is unknown. Furthermore, rating of shoulder-disability using patient-reported outcomes is time-consuming, and a faster approach is needed.

Objectives: First, compare shoulder-disability among common shoulder-disorders.

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Introduction: To enhance health and prevent secondary consequences for patients with cardiovascular disease (CVD), maintenance of an active lifestyle following participation in cardiac rehabilitation (CR) is important. However, levels of physical activity often decrease after completion of a structured CR programme. Models that support long-term behaviour change with a sustained level of physical activity are imperative.

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Bkground: No studies have tested the validity of the Copenhagen Hip and Groin Outcome Score (HAGOS) using modern test theory, across different cultures and languages.

Objective: To validate the Danish, English and Norwegian versions of HAGOS and its six subscales (Symptoms (S, Item 1-7), Pain (P, Item 1-10), activities of daily living (Item 1-5), Sport and recreation (Sport/rec, Item 1-8), Participation in physical activity (item 1-2) and quality of life (item 1-5)) by evaluating differential item functioning (DIF) and measurement invariance across the three language versions in male multidirectional team athletes with groin pain. Second, to modify subscales depending on goodness-of-fit to the item response theory models and calculate conversion tables if language DIF was observed.

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Article Synopsis
  • A study investigated the impact of subacromial impingement syndrome (SIS) on lost workdays, finding that patients lost an average of 27 workdays in six months post-diagnosis.
  • The research was conducted with 157 patients diagnosed with SIS, where 66 were identified as being at risk of losing workdays due to their condition.
  • The results indicated that SIS leads to significantly higher productivity loss compared to other shoulder disorders, emphasizing the need for attention to SIS in work environments.
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  • - A 2019 recommendation advised against subacromial decompression surgery, leaving nonoperative care as the main treatment for shoulder pain, but existing exercise protocols may not offer sufficient strength training.
  • - The study aimed to determine if significantly increasing shoulder strengthening exercises in nonoperative care for subacromial impingement would yield better results compared to standard care.
  • - Results showed no significant differences in outcomes between the enhanced exercise group and the control group after four months, with both groups reporting similar improvements in shoulder pain and function.
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Objective: We assessed past-season, pre-season and in-season risk factors to investigate their association with an in-season groin problem in male amateur football players.

Methods: Past-season groin-pain information and pre-season short-lever and long-lever adductor squeeze strength were obtained at baseline, together with anthropometrics (weight, lower limb lever length) and player age. In-season hip-related and groin-related sporting function was monitored every 4 weeks using the Sports and Recreation (Sport) subscale from the Hip And Groin Outcome Score questionnaire (HAGOS (Sport)).

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Background: Evidence-based guidelines recommend exercise-therapy as first line treatment for subacromial pain syndrome, but no previous study has mapped the content of care for subacromial pain syndrome and knowledge about adherence to clinical guidelines are lacking. We aim to describe the content and outcome of current care and investigate the relationship between content and outcome of care.

Methods: We invited all patients diagnosed with subacromial pain syndrome at any Danish hospital to participate in this nationwide retrospective population-based cohort-study.

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  • * A total of 438 participants were studied, revealing that the prevalence of sarcopenia increased significantly from a baseline of 25%-69% to 50%-81% after treatment, with muscle loss averaging 2.2% to 10%.
  • * The findings highlight the need for more research on how different cancer treatments influence sarcopenia, as its development can affect patients' quality of life and survival rates, which is crucial for nursing care planning.
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  • - The study examined the occurrence of groin issues in amateur male football players, focusing on a 3-week pre-season versus a 39-week competitive in-season, involving 386 players across 17 teams.
  • - Findings showed that the weekly prevalence of groin problems was significantly higher during the pre-season (21%) compared to in-season (12%), with a prevalence ratio of 1.8.
  • - The researchers suggest that better management of training intensity and early preventive strategies during the pre-season may help reduce groin problems in both phases of the football season.
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Background: Lateral ankle sprains are common in indoor sports. High shoe-surface friction is considered a risk factor for non-contact lateral ankle sprains. Spraino is a novel low-friction patch that can be attached to the outside of sports shoes to minimise friction at the lateral edge, which could mitigate the risk of such injury.

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Background: Eccentric hamstring strength seems important in reducing the odds of future hamstring injuries. While age and previous injury are well-known risk factors for future hamstring injuries, the association of age and previous hamstring injury with eccentric hamstring strength in the following season is unknown.

Purpose: To investigate the association of age and previous hamstring injury with preseason eccentric hamstring strength in soccer players, and to investigate the association between previous hamstring injury duration and preseason eccentric hamstring strength.

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  • * Over a full season, 407 amateur male football players were monitored, revealing an average weekly prevalence of groin problems at 11.7%, with most cases occurring without time loss.
  • * Players reported significantly lower hip and groin-related function scores when experiencing groin problems, regardless of whether they resulted in time loss, suggesting that factors other than symptom severity influence players' decisions to continue playing.
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Subacromial impingement syndrome is one of the most common causes of shoulder pain and is associated with substantial shoulder impairments. The initial treatment should be non-operative in form of rotator cuff and scapula strengthening exercises for at least three months. Not all patients respond satisfactorily to non-operative treatment, but only patients with persistent symptoms after sufficiently tried non-operative treatment, should be referred to an orthopaedic specialist.

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Purpose: The psychometric properties of the shoulder pain and disability index (SPADI) have been extensively evaluated using classical test theory, but very few studies have applied Rasch analysis. The purpose of this study was to validate the Danish version using Rasch analysis.

Methods: Responses to the SPADI from 229 patients (48% female, mean age 54.

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Background: The high injury incidence during match-play in female adolescent football is a major concern. In football, males and females play matches with the same football size. No studies have investigated the effect of football size on injury incidence in female adolescent football.

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