title: Incidence and prevalence of lower extremity tendinopathy in a Dutch general practice population: a cross sectional study.
abstract: BACKGROUND
  Lower extremity tendinopathy is a common sports injury, but it can also affect non-athletes. Because tendinopathy is difficult to treat and has negative effects on the ability to work and quality of life, development of preventive interventions is important. The first step in the Van Mechelen prevention model is to determine the extent of the problem. The primary aim of this study was to determine the incidence and prevalence of lower extremity tendinopathy in a Dutch general practice population. The secondary aim was to investigate possible associated factors.
  
  
  METHODS
  A cross-sectional study was performed in a Dutch general practice. Using International Classification of Primary Care codes, the electronic patient files were searched to identify cases of adductor tendinopathy, greater trochanteric pain syndrome, jumper's knee, Achilles tendinopathy, and plantar fasciopathy in 2012. The tendinopathy patients were compared to the general practice population regarding age, gender, use of medication, and comorbidity using 95% confidence intervals.
  
  
  RESULTS
  The prevalence and incidence rates of lower extremity tendinopathy found in this study were 11.83 and 10.52 per 1000 person-years. Lower extremity tendinopathy was more prevalent among older patients. No differences between tendinopathy patients and the general practice population were found regarding gender, use of medication, or comorbidity.
  
  
  CONCLUSIONS
  In this cross-sectional study in a Dutch general practice, the prevalence and incidence rates of lower extremity tendinopathy were 11.83 and 10.52 per 1000 person-years. Lower extremity tendinopathy deserves a higher place in locomotor system research to develop preventive interventions.
authors.affiliation: Center for Sports Medicine, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9700, RB, Groningen, The Netherlands. i.s.albers@umcg.nl.
authors.forename: Iris Sophie
authors.initials: IS
authors.lastname: Albers
authors.affiliation: Center for Sports Medicine, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9700, RB, Groningen, The Netherlands. j.zwerver@umcg.nl.
authors.forename: Johannes
authors.initials: J
authors.lastname: Zwerver
authors.affiliation: Center for Sports Medicine, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9700, RB, Groningen, The Netherlands. r.l.diercks@umcg.nl.
authors.forename: Ronald Leo
authors.initials: RL
authors.lastname: Diercks
authors.affiliation: Department of General Practice, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands. j.h.dekker@umcg.nl.
authors.forename: Janny Hendrika
authors.initials: JH
authors.lastname: Dekker
authors.affiliation: Center for Sports Medicine, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9700, RB, Groningen, The Netherlands. i.scheek@umcg.nl.
authors.forename: Inge
authors.initials: I
authors.lastname: Van den Akker-Scheek
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D005260:Female; D058006:General Practice / Q000379:methods* / Q000639:trends; D006801:Humans; D015994:Incidence; D035002:Lower Extremity / Q000293:injuries* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009426:Netherlands / Q000453:epidemiology; D011159:Population Surveillance / Q000379:methods; D015995:Prevalence; D012189:Retrospective Studies; D052256:Tendinopathy / Q000175:diagnosis* / Q000453:epidemiology* / Q000628:therapy; D055815:Young Adult