title: Knee contact forces and lower extremity support moments during running in young individuals post-partial meniscectomy.
abstract: OBJECTIVE
  While partial meniscectomy results in a compromised tibiofemoral joint, little is known regarding tibiofemoral joint loading during running in individuals who are post-partial meniscectomy. It was hypothesized that individuals post-partial meniscectomy would run with a greater hip support moment, yielding reduced peak knee extension moments and reduced tibiofemoral joint contact forces.
  
  
  METHODS
  3-D Treadmill running mechanics were evaluated in 23 athletic individuals post-partial meniscectomy (37.5 ± 19.0 months post-partial meniscectomy) and 23 matched controls. Bilateral hip, knee and ankle contributions to the total support moment and the peak knee extension moment were calculated. A musculoskeletal model estimated peak and impulse tibiofemoral joint contact forces. Knee function was quantified with the Knee injury and Osteoarthritis Outcome Score (KOOS).
  
  
  RESULTS
  During running, the partial meniscectomy group had a greater hip support moment (p = 0.002) and a reduced knee support moment (p < 0.001) relative to the total support moment. This movement pattern was associated with a 14.5 % reduction (p = 0.019) in the peak knee extension moment. Despite these differences, there were no significant group differences in peak or impulse tibiofemoral joint contact forces. Lower KOOS Quality of Life scores were associated with greater hip support moment (p = 0.004, r = -0.58), reduced knee support moment (p = 0.006, r = 0.55) and reduced peak knee extension moment (p = 0.01, r = 0.52).
  
  
  CONCLUSIONS
  Disordered running mechanics are present long term post-partial meniscectomy. A coordination strategy that shifts a proportion of the total support moment away from the knee to the hip reduces the peak knee extension moment, but does not equate to reduced tibiofemoral joint contact forces during running in individuals post-partial meniscectomy.
  
  
  METHODS
  III.
authors.affiliation: Department of Physical Therapy, College of Allied Health Sciences, East Carolina University, Mail Stop: 668 Allied Health, Greenville, NC, 27834, USA. willyr@ecu.edu.
authors.forename: R W
authors.identifier: http://orcid.org/0000-0002-1249-228X
authors.initials: RW
authors.lastname: Willy
authors.affiliation: Division of Physical Therapy, College of Health Sciences, Ohio University, Athens, OH, 45701, USA.
authors.forename: M A
authors.initials: MA
authors.lastname: Bigelow
authors.affiliation: Division of Physical Therapy, College of Health Sciences, Ohio University, Athens, OH, 45701, USA.
authors.forename: A
authors.initials: A
authors.lastname: Kolesar
authors.affiliation: Department of Physical Therapy, College of Allied Health Sciences, East Carolina University, Mail Stop: 668 Allied Health, Greenville, NC, 27834, USA.
authors.forename: J D
authors.initials: JD
authors.lastname: Willson
authors.affiliation: Division of Physical Therapy, College of Health Sciences, Ohio University, Athens, OH, 45701, USA.
authors.forename: J S
authors.initials: JS
authors.lastname: Thomas
mesh_terms: D001696:Biomechanical Phenomena; D005080:Exercise Test; D005260:Female; D005684:Gait; D006801:Humans; D007718:Knee Injuries / Q000503:physiopathology* / Q000601:surgery; D007719:Knee Joint / Q000503:physiopathology* / Q000601:surgery; D035002:Lower Extremity / Q000503:physiopathology*; D008297:Male; D008592:Menisci, Tibial; D020370:Osteoarthritis, Knee / Q000503:physiopathology; D012420:Running / Q000502:physiology*; D000070600:Tibial Meniscus Injuries; D055815:Young Adult
keywords: Biomechanics; Knee; Meniscectomy; Musculoskeletal modelling; Osteoarthritis; Running