title: Changes in patellofemoral and tibiofemoral joint cartilage damage and bone marrow lesions over 7 years: the Multicenter Osteoarthritis Study.
abstract: To investigate changes in cartilage damage and bone marrow lesions (BMLs) on MRI in the patellofemoral and tibiofemoral joints (TFJs) over 7 years.
  
  
  
  The Multicenter Osteoarthritis (MOST) Study is a cohort study of persons aged 50-79 years at baseline with or at high risk for knee osteoarthritis (OA). Knees were eligible for the current study if they had knee MRI (1.0T) assessed for cartilage damage and BMLs at the baseline and 84-month visits. Knees were categorized as having MRI-detected structural damage (cartilage and BMLs) isolated to the patellofemoral joint (PFJ), isolated to the TFJ, mixed or no damage at baseline and 84-months. We determined the changes in PFJ and TFJ structural damage over 7 years and used logistic regression to assess the relation of baseline compartment distribution to incident isolated PFJ, isolated TFJ and mixed damage.
  
  
  
  Among 339 knees that had full-thickness cartilage loss isolated to the PFJ or TFJ at baseline, only 68 (20.1%) developed full-thickness cartilage loss in the other compartment while 271 (79.9%) continued to only have the initial compartment affected. Compared to knees without full-thickness cartilage damage (n = 582), those with isolated TFJ and PFJ full-thickness cartilage damage had 2.7 (1.5, 4.9) and 5.8 (3.6, 9.6) times the odds of incident mixed full-thickness cartilage damage, respectively. Similar results were seen when using other definitions of MRI-defined structural damage.
  
  
  
  Most knees with structural damage at baseline do not develop it in the other compartment. Knees that develop mixed structural damage are more likely to start with it isolated to the PFJ.
authors.affiliation: Department of Physical Therapy, Movement & Rehabilitation Sciences, Northeastern University, Boston, MA, USA; Clinical Epidemiology Research and Training Unit, Boston University School of Medicine, Boston, MA, USA. Electronic address: j.stefanik@northeastern.edu.
authors.forename: J J
authors.initials: JJ
authors.lastname: Stefanik
authors.affiliation: Quantitative Imaging Center, Department of Radiology, Boston University School of Medicine, Boston, MA, USA. Electronic address: ali.guermazi@bmc.org.
authors.forename: A
authors.initials: A
authors.lastname: Guermazi
authors.affiliation: Quantitative Imaging Center, Department of Radiology, Boston University School of Medicine, Boston, MA, USA; Department of Radiology, University of Erlangen-Nuremberg, Erlangen, Germany. Electronic address: frank.roemer@klinikum-augsburg.de.
authors.forename: F W
authors.initials: FW
authors.lastname: Roemer
authors.affiliation: Research Institute for Primary Care and Health Sciences, Keele University, Keele, United Kingdom. Electronic address: g.m.peat@keele.ac.uk.
authors.forename: G
authors.initials: G
authors.lastname: Peat
authors.affiliation: Clinical Epidemiology Research and Training Unit, Boston University School of Medicine, Boston, MA, USA. Electronic address: niujp@bu.edu.
authors.forename: J
authors.initials: J
authors.lastname: Niu
authors.affiliation: Department of Epidemiology, The University of Iowa, Iowa City, IA, USA; Department of Rehabilitation Medicine, University of Kansas, Kansas City, KS, USA. Electronic address: neil-nsegal@kumc.edu.
authors.forename: N A
authors.initials: NA
authors.lastname: Segal
authors.affiliation: Department of Medicine, UAB, Birmingham, AB, USA. Electronic address: celewis@uabmc.edu.
authors.forename: C E
authors.initials: CE
authors.lastname: Lewis
authors.affiliation: Department of Epidemiology and Biostatistics, UCSF, San Francisco, CA, USA. Electronic address: mnevitt@psg.ucsf.edu.
authors.forename: M
authors.initials: M
authors.lastname: Nevitt
authors.affiliation: Clinical Epidemiology Research and Training Unit, Boston University School of Medicine, Boston, MA, USA. Electronic address: dfelson@bu.edu.
authors.forename: D T
authors.initials: DT
authors.lastname: Felson
mesh_terms: D000368:Aged; D001853:Bone Marrow; D002357:Cartilage Diseases; D002358:Cartilage, Articular; D015331:Cohort Studies; D006801:Humans; D007719:Knee Joint; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D020370:Osteoarthritis, Knee; D057071:Patellofemoral Joint
keywords: Knee osteoarthritis; MRI; Pain
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