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Datti IP, Silva R, Ejnisman L. The Envelope of Function: Revisiting the Theory With New Concepts-A Narrative Review. J Am Acad Orthop Surg 2024:00124635-990000000-01045. [PMID: 39018669 DOI: 10.5435/jaaos-d-23-00433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 05/18/2024] [Indexed: 07/19/2024] Open
Abstract
Musculoskeletal injuries are a complex multifactorial phenomenon, and several factors can contribute to their occurrence. This review aimed to discuss some relevant and often unexpected elements involved in musculoskeletal injuries and rehabilitation. One of the main factors discussed is the role of physiological adaptation to training in musculoskeletal injury susceptibility. This is probably the most modifiable factor in preventing and treating musculoskeletal injuries. Other factors discussed are the role of genetics in injury susceptibility; the effect of stressors and environmental factors and the way we deal with setbacks; anabolic steroid use as aesthetic and performance-enhancement drugs; nutrition, sleeping, and the imbalance between rest, energy intake, and training; anatomic and biomechanical factors; and the role of systemic disease. Moreover, the topic of unknown factors keeps an open door for future discoveries. This review highlights the importance of understanding the various factors contributing to musculoskeletal injuries and the need for an individualized approach to injury prevention and rehabilitation, from both a historical and a physiological point of view.
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Affiliation(s)
- Iberê P Datti
- From the Grupo de Cirurgia de Joelho, Clínica de Ortopedia e Traumatologia, Hospital do Servidor Público Municipal, São Paulo-SP, Brasil (Datti), the Centro Universitário UniFECAF, Taboão da Serra - SP, Brasil (Silva), Hospital Israelita Albert Einstein, São Paulo-SP, Brasil (Ejnisman)
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Kutac P, Jandacka D, Elavsky S, Uchytil J, Bunc V, Krajcigr M, Barot T. The effect of regular running on the bone tissue of middle-aged men and women. J Sports Med Phys Fitness 2024; 64:455-464. [PMID: 38261331 DOI: 10.23736/s0022-4707.23.15279-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
BACKGROUND Many authors consider running to be a protective physical activity (PA) in bone health. However, many studies also show inconsistencies in their results. The objective of the study is to analyze the effect of cumulative loading rate (TCL) on the bone mass of middle-aged runners and non-runners is assessed. METHODS This cross-sectional study included 322 individuals. There were 212 runners (109 male, 103 female) and those were individuals who did >10 km of running per week. There were 110 non-runners (54 male, 56 female). This group included individuals who did not adhere to the WHO (2020) recommendations for PA. The average age in the individual groups ranged from 40.9±4.1 to 42.3±4.8 years. Bone parameters were measured on the lower extremities and vertebral spine using the DXA method (Hologic QDR Horizon A). Multi-regression dependencies analysis was used to assess the results. RESULTS The results of the multi-regression dependencies analysis showed that the bone mineral content (BMC) and bone mineral density (BMD) are significantly influenced by the TCL and gender. CONCLUSIONS Therefore, we can conclude that running could be a suitable PA for preventing the reduction of BMD in the middle-aged population, especially in the lower limbs.
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Affiliation(s)
- Petr Kutac
- Department of Human Movement Studies, University of Ostrava, Ostrava, Czech Republic -
| | - Daniel Jandacka
- Department of Human Movement Studies, University of Ostrava, Ostrava, Czech Republic
| | - Steriani Elavsky
- Department of Human Movement Studies, University of Ostrava, Ostrava, Czech Republic
| | - Jaroslav Uchytil
- Department of Human Movement Studies, University of Ostrava, Ostrava, Czech Republic
| | - Vaclav Bunc
- Faculty of Education, Charles University, Prague, Czech Republic
| | - Miroslav Krajcigr
- Department of Human Movement Studies, University of Ostrava, Ostrava, Czech Republic
| | - Tomas Barot
- Department of Mathematics with Didactics, University of Ostrava, Ostrava, Czech Republic
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Jacob G, Shimomura K, Nakamura N. Biologic therapies in stress fractures: Current concepts. J ISAKOS 2024:S2059-7754(24)00078-6. [PMID: 38631518 DOI: 10.1016/j.jisako.2024.04.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 04/08/2024] [Accepted: 04/10/2024] [Indexed: 04/19/2024]
Abstract
Stress fractures, a common overuse injury in physically active individuals, present a significant challenge for athletes and military personnel. Patients who sustain stress fractures have demanding training regimes where periods of rest and immobilisation have unacceptable negative consequences on sports goals and finances. Aside from being an overuse injury, there are various contributing risk factors that put certain individuals at risk of a stress fracture. The main two being nutritional deficiencies and hormonal variations, which have significant effects on bone metabolism and turnover. Historically, treatment of stress fractures focused on conservative strategies such as rest and immobilisation. Calcium and vitamin D deficiencies have been closely linked to stress fractures and so over time supplementation has also played a role in treatment. With the introduction of biologics into orthopaedics, newer treatment strategies have been applied to accelerate fracture healing and perhaps improve fracture callus quality. If such therapies can reduce time spent away from sport and activity, it would be ideal for treating stress fractures. This article aims to offer insights into the evolving landscape of stress fracture management. It investigates the pre-clinical evidence and available published clinical applications. Though fracture healing is well understood, the role of biologics for fracture healing is still indeterminate. Available literature for the use of biologic therapies in stress fractures are restricted and most reports have used biologics as a supplement to surgical fixation in subjects in studies that lack control groups. Randomised control trials have been proposed and registered by a few groups, with results awaited. Assessing individuals for risk factors, addressing hormonal imbalances and nutritional deficiencies seems like an effective approach to addressing the burden of stress fractures. We await better designed trials and studies to accurately determine the clinical benefit of adding biologics to the management of these injuries.
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Affiliation(s)
- George Jacob
- Department of Orthopaedic Surgery, Lakeshore Hospital, Cochin, India
| | - Kazunori Shimomura
- Department of Rehabilitation, Kansai University of Welfare Sciences, Osaka, Japan; Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Norimasa Nakamura
- Institute for Medical Science in Sports, Osaka Health Science University, Osaka, Japan; Global Centre for Medical Engineering and Informatics, Osaka University, Osaka, Japan.
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Madzar T, Masina T, Zaja R, Kastelan S, Cvetkovic JP, Brborovic H, Dvorski M, Kirin B, Barisic AV, Cehok I, Milosevic M. Overtraining Syndrome as a Risk Factor for Bone Stress Injuries among Paralympic Athletes. MEDICINA (KAUNAS, LITHUANIA) 2023; 60:52. [PMID: 38256312 PMCID: PMC10819479 DOI: 10.3390/medicina60010052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 12/22/2023] [Accepted: 12/26/2023] [Indexed: 01/24/2024]
Abstract
Background and Objectives: In this review, we have explored the relationship between overtraining syndrome (OTS) and bone stress injuries among paralympic athletes. OTS is a complex condition that arises from an imbalance between training volume, nutrition, and recovery time, leading to significant negative effects on paralympic athlete's performance and overall well-being. On the other hand, bone stress injuries occur when abnormal and repetitive loading is applied to normal bone, resulting in microdamage accumulation and potential. The prevalence of overtraining syndrome and bone stress injuries among athletes highlights the need for a better understanding of their relationship and implications for prevention and management strategies. Methods: A literature review from the PubMed, Web of Science, and Google Scholar databases including the MeSH keywords "overtraining syndrome", "bone", and "paralympic athletes". Results: Studies have consistently shown that athletes engaged in endurance sports are particularly susceptible to overtraining syndrome. The multifactorial nature of this condition involves not only physical factors, but also psychological and environmental determinants. In addition, the diagnosis and management of OTS and bone stress injuries present challenges in clinical practice. Conclusions: Currently, there are no definitive biochemical markers for overtraining syndrome. The diagnosis is based on a combination of subjective measures such as questionnaires, symptoms checklists, and objective biomarkers, including hormone levels, inflammatory markers, and imaging studies. However, these diagnostic approaches have limitations regarding their specificity and sensitivity.
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Affiliation(s)
| | - Tonci Masina
- School of Medicine, University of Zagreb, Salata 3, 10000 Zagreb, Croatia; (T.M.); (R.Z.); (S.K.); (J.P.C.); (H.B.); (M.D.)
| | - Roko Zaja
- School of Medicine, University of Zagreb, Salata 3, 10000 Zagreb, Croatia; (T.M.); (R.Z.); (S.K.); (J.P.C.); (H.B.); (M.D.)
| | - Snjezana Kastelan
- School of Medicine, University of Zagreb, Salata 3, 10000 Zagreb, Croatia; (T.M.); (R.Z.); (S.K.); (J.P.C.); (H.B.); (M.D.)
| | - Jasna Pucarin Cvetkovic
- School of Medicine, University of Zagreb, Salata 3, 10000 Zagreb, Croatia; (T.M.); (R.Z.); (S.K.); (J.P.C.); (H.B.); (M.D.)
| | - Hana Brborovic
- School of Medicine, University of Zagreb, Salata 3, 10000 Zagreb, Croatia; (T.M.); (R.Z.); (S.K.); (J.P.C.); (H.B.); (M.D.)
| | - Matija Dvorski
- School of Medicine, University of Zagreb, Salata 3, 10000 Zagreb, Croatia; (T.M.); (R.Z.); (S.K.); (J.P.C.); (H.B.); (M.D.)
| | - Boris Kirin
- Croatian Paralympic Committee, Savska Cesta 137, 10000 Zagreb, Croatia; (B.K.); (A.V.B.)
- General County Hospital Bjelovar, Antuna Mihanovica 8, 43000 Bjelovar, Croatia
| | - Andreja Vukasovic Barisic
- Croatian Paralympic Committee, Savska Cesta 137, 10000 Zagreb, Croatia; (B.K.); (A.V.B.)
- General County Hospital Bjelovar, Antuna Mihanovica 8, 43000 Bjelovar, Croatia
| | - Ivan Cehok
- Department of Nursing, University North, 104 Brigade 3, 42000 Varazdin, Croatia;
| | - Milan Milosevic
- School of Medicine, University of Zagreb, Salata 3, 10000 Zagreb, Croatia; (T.M.); (R.Z.); (S.K.); (J.P.C.); (H.B.); (M.D.)
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Farhart P, Beakley D, Diwan A, Duffield R, Rodriguez EP, Chamoli U, Watsford M. Intrinsic variables associated with low back pain and lumbar spine injury in fast bowlers in cricket: a systematic review. BMC Sports Sci Med Rehabil 2023; 15:114. [PMID: 37730648 PMCID: PMC10512628 DOI: 10.1186/s13102-023-00732-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 09/12/2023] [Indexed: 09/22/2023]
Abstract
BACKGROUND Lumbar spine injuries in fast bowlers account for the greatest missed playing time in cricket. A range of extrinsic and intrinsic variables are hypothesised to be associated with low back pain and lumbar spine injury in fast bowlers, and an improved understanding of intrinsic variables is necessary as these may alter load tolerance and injury risk associated with fast bowling. This review critically evaluated studies reporting intrinsic variables associated with low back pain and lumbar spine injury in fast bowlers and identified areas for future investigation. METHODS OVID Medline, EMBASE, SPORTDiscus, CINAHL, Web of Science and SCOPUS databases were last searched on 3 June 2022 to identify studies investigating intrinsic variables associated with low back pain and lumbar spine injury in cricket fast bowlers. Terms relevant to cricket fast bowling, and intrinsic variables associated with lumbar spine injury and low back pain in fast bowlers were searched. 1,503 abstracts were screened, and 118 full-text articles were appraised to determine whether they met inclusion criteria. Two authors independently screened search results and assessed risk of bias using a modified version of the Quality in Prognostic Studies tool. RESULTS Twenty-five studies met the inclusion criteria. Overall, no included studies demonstrated a low risk of bias, two studies were identified as moderate risk, and twenty-three studies were identified as high risk. Conflicting results were reported amongst studies investigating associations of fast bowling kinematics and kinetics, trunk and lumbar anatomical features, anthropometric traits, age, and neuromuscular characteristics with low back pain and lumbar spine injury. CONCLUSION Inconsistencies in results may be related to differences in study design, injury definitions, participant characteristics, measurement parameters, and statistical analyses. Low back pain and lumbar spine injury occurrence in fast bowlers remain high, and this may be due to an absence of low bias studies that have informed recommendations for their prevention. Future research should employ clearly defined injury outcomes, analyse continuous datasets, utilise models that better represent lumbar kinematics and kinetics during fast bowling, and better quantify previous injury, lumbar anatomical features and lumbar maturation. TRIAL REGISTRATION Open Science Framework https://doi.org/10.17605/OSF.IO/ERKZ2 .
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Affiliation(s)
- Patrick Farhart
- School of Sport, Exercise and Rehabilitation, Faculty of Health, Human Performance Research Centre, Moore Park Precinct, University of Technology Sydney, Broadway, NSW, 2007, Australia.
- Spine Labs, Discipline of Surgery, St. George and Sutherland Campus of the Clinical School, Faculty of Medicine, University of New South Wales, Kogarah, NSW, 2217, Australia.
- Cricket New South Wales, 161 Silverwater Road, Sydney Olympic Park, Sydney, NSW, 2127, Australia.
- Delhi Capitals, JSW GMR Cricket Private Limited, Bahadurshah Zafar Marg, New Delhi, 110002, India.
| | - David Beakley
- Deakin University, Burwood Highway, Burwood, VIC, 3125, Australia
| | - Ashish Diwan
- Spine Labs, Discipline of Surgery, St. George and Sutherland Campus of the Clinical School, Faculty of Medicine, University of New South Wales, Kogarah, NSW, 2217, Australia
- Spine Service, Department of Orthopaedic Surgery, St. George Hospital Campus, Kogarah, NSW, 2217, Australia
| | - Rob Duffield
- School of Sport, Exercise and Rehabilitation, Faculty of Health, Human Performance Research Centre, Moore Park Precinct, University of Technology Sydney, Broadway, NSW, 2007, Australia
| | - Elizabeth Pickering Rodriguez
- School of Sport, Exercise and Rehabilitation, Faculty of Health, Human Performance Research Centre, Moore Park Precinct, University of Technology Sydney, Broadway, NSW, 2007, Australia
| | - Uphar Chamoli
- Spine Labs, Discipline of Surgery, St. George and Sutherland Campus of the Clinical School, Faculty of Medicine, University of New South Wales, Kogarah, NSW, 2217, Australia
- School of Biomedical Engineering, Faculty of Engineering and Information Technology, University of Technology Sydney, Broadway, NSW, 2007, Australia
| | - Mark Watsford
- School of Sport, Exercise and Rehabilitation, Faculty of Health, Human Performance Research Centre, Moore Park Precinct, University of Technology Sydney, Broadway, NSW, 2007, Australia
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Haines MS, Kaur S, Scarff G, Lauze M, Gerweck A, Slattery M, Oreskovic NM, Ackerman KE, Tenforde AS, Popp KL, Bouxsein ML, Miller KK, Misra M. Male Runners With Lower Energy Availability Have Impaired Skeletal Integrity Compared to Nonathletes. J Clin Endocrinol Metab 2023; 108:e1063-e1073. [PMID: 37079740 PMCID: PMC10505543 DOI: 10.1210/clinem/dgad215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 12/19/2022] [Accepted: 04/18/2023] [Indexed: 04/22/2023]
Abstract
CONTEXT Female athletes, particularly runners, with insufficient caloric intake for their energy expenditure [low energy availability (EA) or relative energy deficiency] are at risk for impaired skeletal integrity. Data are lacking in male runners. OBJECTIVE To determine whether male runners at risk for energy deficit have impaired bone mineral density (BMD), microarchitecture, and estimated strength. DESIGN Cross-sectional. SETTING Clinical research center. PARTICIPANTS 39 men (20 runners, 19 controls), ages 16-30 years. MAIN OUTCOME MEASURES Areal BMD (dual-energy x-ray absorptiometry); tibia and radius volumetric BMD and microarchitecture (high-resolution peripheral quantitative computed tomography); failure load (microfinite element analysis); serum testosterone, estradiol, leptin; energy availability. RESULTS Mean age (24.5 ± 3.8 y), lean mass, testosterone, and estradiol levels were similar; body mass index, percent fat mass, leptin, and lumbar spine BMD Z-score (-1.4 ± 0.8 vs -0.8 ± 0.8) lower (P < .05); and calcium intake and running mileage higher (P ≤ .01) in runners vs controls. Runners with EA CONCLUSIONS Despite weight-bearing activity, skeletal integrity is impaired in male runners with lower caloric intake relative to exercise energy expenditure, which may increase bone stress injury risk. Lower estradiol and lean mass are associated with lower tibial strength in runners.
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Affiliation(s)
- Melanie S Haines
- Neuroendocrine Unit, Massachusetts General Hospital, Boston, MA 02114, USA
- Harvard Medical School, Boston, MA 02115, USA
| | - Snimarjot Kaur
- Neuroendocrine Unit, Massachusetts General Hospital, Boston, MA 02114, USA
- Harvard Medical School, Boston, MA 02115, USA
| | - Geetanjali Scarff
- Neuroendocrine Unit, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Meghan Lauze
- Neuroendocrine Unit, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Anu Gerweck
- Neuroendocrine Unit, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Meghan Slattery
- Neuroendocrine Unit, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Nicolas M Oreskovic
- Harvard Medical School, Boston, MA 02115, USA
- Department of Internal Medicine and Pediatrics, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Kathryn E Ackerman
- Neuroendocrine Unit, Massachusetts General Hospital, Boston, MA 02114, USA
- Harvard Medical School, Boston, MA 02115, USA
- Female Athlete Program, Division of Sports Medicine, Boston Children's Hospital, Boston, MA 02115, USA
| | - Adam S Tenforde
- Harvard Medical School, Boston, MA 02115, USA
- Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Cambridge, MA 02129, USA
| | - Kristin L Popp
- Harvard Medical School, Boston, MA 02115, USA
- Endocrine Unit, Massachusetts General Hospital, Boston, MA 02114, USA
- Military Performance Division, United States Army Research Institute of Environmental Medicine, Natick, MA 01760, USA
- Department of Energy, Oak Ridge Institute for Science and Education, Oak Ridge, TN 37830, USA
| | - Mary L Bouxsein
- Harvard Medical School, Boston, MA 02115, USA
- Endocrine Unit, Massachusetts General Hospital, Boston, MA 02114, USA
- Center for Advanced Orthopedic Studies, Beth Israel Deaconess Medical Center, Boston, MA 02115, USA
| | - Karen K Miller
- Neuroendocrine Unit, Massachusetts General Hospital, Boston, MA 02114, USA
- Harvard Medical School, Boston, MA 02115, USA
| | - Madhusmita Misra
- Neuroendocrine Unit, Massachusetts General Hospital, Boston, MA 02114, USA
- Harvard Medical School, Boston, MA 02115, USA
- Division of Pediatric Endocrinology, Massachusetts General Hospital, Boston, MA 02114, USA
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Hamstra-Wright KL, Bliven KCH, Coumbe-Lilley JE, Djelovic E, Patel J. The Relationship Between Eating Disorders, Disordered Eating, and Injury in Athletes: A Critically Appraised Topic. J Sport Rehabil 2023; 32:474-481. [PMID: 37030667 DOI: 10.1123/jsr.2022-0370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 01/14/2023] [Accepted: 02/02/2023] [Indexed: 04/10/2023]
Abstract
CLINICAL SCENARIO Eating disorders (EDs) and disordered eating (DE) result in numerous physical and psychological complications for female and male athletes. Besides bone-related injury, little research exists investigating what injuries EDs and/or DE contribute to. CLINICAL QUESTION Are EDs and/or DE a risk factor for injury incidence in athletes? SUMMARY OF KEY FINDINGS We searched for prospective studies assessing EDs or DE as a risk factor for injury in female or male athletes high school age and older. Our search returned 5 studies. One study found Eds, or DE were not a risk for any type of injury in female cross-country and track-and-field athletes. Two studies found a possible relationship between EDs or DE, as one contributing factor of others, in the incidence of bone stress injuries (BSIs) in female athletes who compete in various sports. One study found female, but not male, cross-country and track-and-field athletes with a history of EDs were more at risk for stress fractures than those without a history. One study found Eds, or DE were not a risk for BSI in female runners and triathletes. CLINICAL BOTTOM LINE Large and important gaps in the literature exist investigating injuries related to EDs or DE outside of BSIs. There is low-moderate evidence that EDs and/or DE are either a sole, or contributing, risk factor for BSIs in female athletes. STRENGTH OF RECOMMENDATION Grade B evidence exists to support the idea that EDs and/or DE are a risk factor for a specific type of injury (BSI) in female athletes only.
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Affiliation(s)
- Karrie L Hamstra-Wright
- Department of Kinesiology and Nutrition, Applied Sport Psychology and Injury Research and Education (ASPIRE) Lab, University of Illinois at Chicago, Chicago, IL,USA
| | - Kellie C Huxel Bliven
- Department of Interdisciplinary Health Studies, Arizona School of Health Sciences, A.T. Still University, Mesa, AZ,USA
| | - John E Coumbe-Lilley
- Department of Kinesiology and Nutrition, Applied Sport Psychology and Injury Research and Education (ASPIRE) Lab, University of Illinois at Chicago, Chicago, IL,USA
| | - Eddin Djelovic
- Department of Kinesiology and Nutrition, Applied Sport Psychology and Injury Research and Education (ASPIRE) Lab, University of Illinois at Chicago, Chicago, IL,USA
| | - Jahnvi Patel
- Department of Kinesiology and Nutrition, Applied Sport Psychology and Injury Research and Education (ASPIRE) Lab, University of Illinois at Chicago, Chicago, IL,USA
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The Relationship Between Stress Fractures and Bone Turnover Markers Is Unclear in Athletic and Military Populations: A Critically Appraised Topic. INTERNATIONAL JOURNAL OF ATHLETIC THERAPY AND TRAINING 2022. [DOI: 10.1123/ijatt.2021-0115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Clinical Scenario: Having an indication of how bone is remodeling in response to training load could help identify athletes and military personnel at increased stress fracture (SFx) risk. Direct assessment of bone remodeling is impractical. Biochemical markers of bone turnover are used as an indirect measure of bone remodeling and have potential to inform prevention and treatment efforts. To date, the relationship between bone turnover markers and SFxs in athletes or military personnel remains unclear. Clinical Question: Are SFxs related to bone turnover markers in athletes and military personnel? Summary of Key Findings: Seven met eligibility criteria. In five studies, an association between SFxs and bone turnover markers existed. Clinical Bottom Line: The evidence supporting a relationship between SFxs and bone turnover markers in athletes and military personnel is mixed. While five of the seven studies reported some type of relationship, no studies prospectively measured bone turnover markers in a group of athletes or military personnel without an SFx or without SFx history and followed them over time to reassess bone turnover markers upon SFx occurrence. Strength of Clinical Recommendation: In accordance with the Strength of Recommendation Taxonomy, Grade C is the most appropriate strength of recommendation rating.
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