Kristian Thorborg

Kristian Thorborg
Copenhagen University Hospital Hvidovre · Department of Orthopedics

PT, Professor, Ph.d.

About

355
Publications
206,726
Reads
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9,193
Citations
Citations since 2016
226 Research Items
8163 Citations
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201620172018201920202021202205001,0001,500
Additional affiliations
January 2020 - present
Copenhagen Univeristy
Position
  • Professor
January 2014 - December 2019
Copenhagen University
Position
  • Professor (Associate)
May 2013 - December 2018
Copenhagen University Hospital Hvidovre
Position
  • Senior Researcher
Education
January 2008 - January 2011
University of Copenhagen
Field of study
  • Clinical Outcome Measures for Physically Active Individuals with Hip and Groin Pain
March 2003 - November 2003
August 1995 - June 1998
School of Physiotherapy, Copenhagen
Field of study

Publications

Publications (355)
Article
Full-text available
Background: Previous studies report varying rates of time-loss injuries in adolescent female soccer, ranging from 2.4 to 5.3 per 1000 athlete-exposures or 2.5 to 3.7 per 1000 hours of exposure. However, these studies collected data using traditional injury reports from coaches or medical staff, with methods that significantly underestimate injury...
Article
Full-text available
Background: Adductor-related pain is the most common clinical finding in soccer players with groin pain and can be a long-standing problem affecting physical function and performance. Hip adductor weakness has been suggested to be associated with this clinical entity, although it has never been investigated. Purpose: To investigate whether isometr...
Article
The incidence of acute hamstring injuries is high in several sports, including the different forms of football. The authors investigated the preventive effect of eccentric strengthening of the hamstring muscles using the Nordic hamstring exercise compared with no additional hamstring exercise on the rate of acute hamstring injuries in male soccer p...
Article
Full-text available
Valid, reliable and responsive Patient-Reported Outcome (PRO) questionnaires for young to middle-aged, physically active individuals with hip and groin pain are lacking. To develop and validate a new PRO in accordance with the COnsensus-based Standards for the selection of health Measurement INstruments (COSMIN) recommendations for use in young to...
Article
Eccentric hip adduction and abduction strength plays an important role in the treatment and prevention of groin injuries in soccer players. Lower extremity strength deficits of less than 10% on the injured side, compared to the uninjured side, have been suggested as the clinical milestone before returning to sports following injury. To examine whet...
Preprint
“The better you go into surgery – the better you leave surgery”. That is the narrative often used to argue the importance of prehabilitation exercise in total knee arthroplasty (TKA) to enhance postoperative recovery. Although the narrative makes sense intuitively, it has been very difficult to show clinically relevant superiority of prehabilitatio...
Article
This statement paper summarises and appraises the evidence on diagnosis, prevention, and treatment of common shoulder injuries in sports. We systematically searched Medline and Embase. The Grading of Recommendations Assessment, Development and Evaluation tool was applied to evaluate the overall quality of evidence. For diagnosis, we included 19 cli...
Article
Full-text available
Purpose Blood flow restriction – low load strength training (BFR-LLST) is theoretically superior to traditional heavy strength training when rehabilitating patients who cannot heavily load tissues following surgery. The main purpose of this study was to examine the feasibility of BFR-LLST added to usual care exercise early after cartilage or menisc...
Article
Full-text available
Introduction: Surgery is not a viable treatment for all patients with hip dysplasia. Currently, usual care for these patients is limited to a consultation on self-management. We have shown that an exercise and patient education intervention is a feasible and acceptable intervention for patients not receiving surgery. Therefore, we aim to investiga...
Article
Adductor-related groin pain is a common problem in sports. Evidence-based management of athletes with adductor strains, adductor ruptures, and longstanding adductor-related groin pain can be approached in a simple, yet effective and individualized manner. In most cases managing adductor-related pain in athletes should be based on specific exercises...
Article
Background and objectives To evaluate the feasibility and acceptability of exercise and patient education for patients with hip dysplasia not receiving surgery. Design Feasibility study. Methods The participants received exercise instruction and patient education over six months. Feasibility covered recruitment, retention, and mechanisms of chang...
Article
Purpose: To investigate the differences in hip adductor and abductor muscle strength in elite male footballers from youth to senior level. Methods: We tested 125 players from the under-13-years (U'13) to senior squads of a Danish male professional football club in this cross-sectional design study. Hip adductor and abductor force (in newtons), t...
Article
Full-text available
Objective: Hip and groin pain is highly prevalent in sub-elite Gaelic Athletic Association (GAA) athletes, but its prevalence at the elite level is unknown. The aims of this study were to report hip and groin pain prevalence in elite male athletes, to report changes in Copenhagen Hip and Groin Outcome Score (HAGOS) across two seasons and to assess...
Article
Full-text available
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. Secondly, rate shoulde...
Preprint
Purpose In musculoskeletal rehabilitation, blood flow restriction – low load strength training (BFR-LLST) is theoretically indicated – as opposed to traditional heavy strength training – in patients who can or may not heavily load tissues healing from recent surgery. The main purpose was to examine the feasibility of BFR-LLST added to usual care ex...
Article
Full-text available
Objective To provide consensus on how to plan, organize and implement exercise-based injury prevention program (IPP) in sports. Design Delphi. Setting LimeSurvey platform. Participants Experienced sports physical therapists from the International Federation of Sports Physical Therapy member countries. Main outcome measures Factors related to sp...
Article
Full-text available
Objective To investigate firstly the efficacy of three different dosages of one home-based, knee-extensor resistance exercise on knee-extensor strength in patients eligible for knee replacement, and secondly, the influence of exercise on symptoms, physical function and decision on surgery. Method One-hundred and forty patients eligible for knee re...
Article
Full-text available
The REPORT guide is a 'How to' guide to help you report your clinical research in an effective and transparent way. It is intended to supplement established first choice reporting tools, such as Consolidated Standards of Reporting Trials (CONSORT), by adding tacit knowledge (ie, learnt, informal or implicit knowledge) about reporting topics that we...
Article
Full-text available
Objective: To investigate the relationship between training/match play duration and time-loss groin injury in professional male soccer players and determine if previously identified intrinsic risk factors influenced this relationship. Design: Prospective cohort study. Methods: A total of 590 professional male soccer players were prospectively...
Preprint
Full-text available
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. Purpose The purpose of this pilot study was to inv...
Article
Full-text available
Objectives To compare long-lever squeeze testing using the ForceFrame and the Copenhagen 5-Second-Squeeze test (5SST) for assessment of hip adduction strength and provoked groin pain in elite male soccer players. Design Cross-sectional study. Setting Pre-season testing at facilities of a Danish professional 1er soccer club and academy. Participa...
Conference Paper
Full-text available
Introduction Lack of consensus regarding terminology and diagnostic criteria used to describe and identify patients with subacromial impingement syndrome (SIS) could be an important driver of misconceptions and misinterpretations of scientific results in this population. We aim to map the literature regarding terminology and diagnostic criteria use...
Conference Paper
Full-text available
Introduction Groin monitoring systems are a secondary prevention tool in youth football. Symptom screenings can be supported by objective findings, such as hip adduction squeeze strength. This study examined how groin pain influenced weekly squeeze strength in youth academy football players over a 14-week period. Materials and Methods Weekly monit...
Article
Objectives The prevalence of pain medication use for adolescent knee pain and factors associated with use are not well understood. This study aimed to determine the self-reported use of pain medication for knee pain and identify factors associated with use in adolescents (age 10–19) with longstanding knee symptoms. Methods In this exploratory cros...
Article
Full-text available
Tendinopathy describes a complex multifaceted pathology of the tendon, characterized by pain, decline in function and reduced exercise tolerance. The most common overuse tendinopathies involve the rotator cuff tendon, medial and lateral elbow epicondyles, patellar tendon, gluteal tendons and the Achilles tendon. The prominent histological and molec...
Article
A Correction to this paper has been published: https://doi.org/10.1038/s41572-021-00251-8.
Article
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), Sp...
Article
Objective: To (1) systematically screen for groin pain and type in young elite soccer players and (2) assess whether hip and groin-related severity and disability differed between players with different levels of groin pain and tenderness. Design: Cross-sectional observational. Setting: Elite American soccer academy at midseason. Participants...
Article
Full-text available
The objective was to investigate, first, whether six weeks of intensive ballet dance exposure is associated with structural and clinical changes in the Achilles tendon; second, the importance of demographics, self-reported Achilles pain, and generalized joint hypermobility (GJH). Data were collected at baseline and at six weeks’ follow-up, using Ac...
Article
Objective To test if 1) the 45-s Anterior Knee Pain Provocation Test (AKPP-test) could differentiate between adolescents with patellofemoral pain (PFP) and pain-free controls and; 2) whether improvements in the AKPP-test over 12 weeks were associated with improvements in self-reported knee function and pain. Design Prospective cohort. Patients 15...
Article
Full-text available
Background Hip and groin pain or symptoms is a recurrent musculoskeletal complaint among young and active individuals. It is important to objectively measure functional limitations using patient-related outcomes that have been validated in the language of the target population. Objectives To perform a cross-cultural adaptation and to evaluate the...
Conference Paper
Background Athletic hip and groin pain is common in the Gaelic Athletic Association (GAA) but its prevalence at elite level is unknown. The changes in Hip and Groin Outcome Score (HAGOS) over a season in and the ability of HAGOS to identify those athletes who will go onto develop hip and groin symptoms has not been reported previously. Objective T...
Conference Paper
Full-text available
Background Low eccentric hamstring strength and sprinting performance are associated with hamstring injury (HI) in football; however, the off-season effects on both qualities are unknown. Objective The aim of the study was to investigate eccentric hamstring strength and sprinting performance changes during the off-season period in football players...
Conference Paper
Background High shoe-surface friction is a proposed risk factor for ‘non-contact’ lateral ankle sprain (LAS) injuries. Spraino® is a novel product that minimizes friction at the lateral edge of the shoe, thereby potentially mitigating the risk. Objective To determine preliminary effect and safety of Spraino® when used to prevent LAS injury among i...
Article
Full-text available
Objective To describe and compare hip and groin strength and function of male ice hockey players over one season in players with and without hip and groin problems in the previous season. Design Prospective cohort study. Setting XXXX male ice hockey. Participants We followed 193 players from 10 teams during the 2017/2018 season. Main outcome me...
Article
This statement summarises and appraises the evidence on diagnostic tests and clinical information, and non-operative treatment of femoroacetabular impingement (FAI) syndrome and labral injuries. We included studies based on the highest available level of evidence as judged by study design. We evaluated the certainty of evidence using the Grading of...
Article
Full-text available
Objective To identify the role of sports physical therapists (PT) in the organization of injury registration and preseason assessment, applied in athletic organizations and sports teams of different gender and level world-wide. Design cross-sectional study. Setting LimeSurvey platform. Participants Sports PTs working with athletes invited throug...
Preprint
The REPORT guide is a “How to” guide to help you achieve effective and transparent clinical trial reporting. It is intended to supplement “first choice” reporting tools, such as CONSORT, by adding tacit knowledge about reporting topics we have struggled with as authors or see others struggle with as journal reviewers or editors. Focus is the random...
Article
Full-text available
Background: Hamstring injuries remain a major burden in football while the effective prevention exercise the Nordic Hamstring is poorly adopted, despite the added positive effects on performance. Better understanding of hamstring function during Nordic Hamstring compared to other exercises may provide better insight to the physiological adaptation...
Article
Full-text available
Background Osgood-Schlatter disease (OSD), an apophyseal injury of the tibial tuberosity, affects up to 1 in 10 adolescents. This condition has previously been assumed to be innocuous and to self-resolve with limited intervention. Purpose To investigate the 24-month prognosis of OSD and examine if ultrasound (US) classification is associated with...
Article
Background Complete avulsions of the adductor longus tendon are serious injuries, yet we have few data to inform clinical decisions on management. Previous studies are limited by a lack of detailed follow-up. Purpose To describe detailed clinical and imaging measures 1 year after complete proximal adductor longus avulsion injuries in athletes who...
Article
Background Despite being the most commonly incurred sports injury with a high recurrence rate, there are no guidelines to inform return to sport (RTS) decisions following acute lateral ankle sprain injuries. We aimed to develop a list of assessment items to address this gap. Methods We used a three-round Delphi survey approach to develop consensus...
Article
Full-text available
A better insight into injuries in elite youth football may inform prevention strategies. The purpose of this prospective cohort study was to investigate the frequency, incidence and pattern of time‐loss injuries in an elite male football academy, exploring injuries in relation to age and maturation status. Across four consecutive playing seasons, p...
Article
Full-text available
Background: A strong recommendation against subacromial decompression surgery was issued in 2019. This leaves nonoperative care as the only treatment option, but recent studies suggest that the dose of strengthening exercise is not sufficient in current nonoperative care. At this point, it is unknown if adding more strengthening to current nonoper...
Article
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 w...
Article
Full-text available
Context: The epidemiological focus on time loss may underestimate the true magnitude of hip and groin problems in male ice hockey players. Objective: To describe the prevalence, incidence and severity of hip and groin problems (time loss and non-time-loss) in Swedish ice hockey players over the course of a season and to explore potential pre-season...
Article
Full-text available
Purpose The Victorian Institute of Sport Assessment (Achilles tendon—VISA-A, greater trochanteric pain syndrome—VISA-G, proximal hamstring tendinopathy—VISA-H, patellar tendon—VISA-P) questionnaires are widely used in research and clinical practice; however, no systematic reviews have formally evaluated their content, structural, and cross-cultural...
Article
Objectives Reduced sports function is often observed after hip arthroscopy for femoroacetabular impingement syndrome (FAIS). Impaired muscle strength could be reasons for this. We aimed to investigate hip muscle strength after hip arthroscopy for FAIS and its association with sports function and participation. Design Cross-sectional study. Method...
Article
Purpose: Increasing age, high quadriceps strength, and low hamstring muscle strength are associated with hamstring strain injury in soccer. The authors investigated the age-related variation in maximal hamstring and quadriceps strength in male elite soccer players from under-13 (U-13) to the senior level. Methods: A total of 125 elite soccer pla...
Article
Full-text available
Purpose The evaluation of measurement properties such as reliability, measurement error, construct validity, and responsiveness provides information on the quality of the scale as a whole, rather than on an item level. We aimed to synthesize the measurement properties referring to reliability, measurement error, construct validity, and responsivene...
Preprint
Full-text available
Objectives To firstly investigate the efficacy of three different dosages of home-based, knee-extensor strength exercise on isometric knee-extensor strength in patients eligible for knee replacement due to severe knee osteoarthritis, and secondly, the influence of exercise on symptoms, physical function and decision on surgery. Design Randomized do...
Article
Full-text available
Injury prevention strategies in team settings should not overlook early detection and secondary prevention. Monitoring systems may be an effective approach to detect common and troublesome injuries, such as hip and groin pain in football (soccer) players. The purpose of this International Perspective is to share our experiences with monitoring hip...
Article
Full-text available
Background Hip arthroscopy is a viable treatment for femoroacetabular impingement syndrome (FAIS). Clinically relevant improvements in hip function and pain after surgery are often reported, but it is less clear how many patients achieve an acceptable symptom state (Patient Acceptable Symptom State [PASS]). Purpose To investigate the proportion of...
Article
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,...
Article
Background: Following total hip- and knee arthroplasty (THA and TKA), post-discharge physical rehabilitation is common practice, but varies significantly regarding content, duration, intensity and mode of delivery. Recent systematic reviews have found home-based rehabilitation to be as good as outpatient rehabilitation in terms of pain and physical...
Article
Full-text available
Background and purpose — In patients with hip dysplasia, knowledge of hip muscle strength after periacetabular osteotomy is lacking. We investigated isometric hip muscle strength in patients with hip dysplasia, before and 1 year after periacetabular osteotomy, and compared this with healthy volunteers. Furthermore, we investigated whether pre- to p...
Article
Full-text available
Footballers with weak hip adductors are at increased risk of groin injury and adductor strengthening has been shown to reduce this risk. However, the minimal effective dose of strength training to improve hip‐adductor strength and mitigate the risk of adductor problems remains unknown. The aim of this randomised controlled trial was to investigate...
Article
Full-text available
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 rel...
Article
This study investigated the weekly prevalence of groin problems over a 3-week football pre-season, compared to a 39-week competitive in-season. We registered time-loss groin injuries, and self-reported weekly groin-pain in 17 amateur male football teams (386 players). The average weekly prevalence of groin problems (prevalence ratio (PR)) was 1.8 t...