title: Comparison of patellar mobility in female adults with and without patellofemoral pain.
abstract: METHODS
  Case control study.
  
  
  OBJECTIVE
  To compare the patellar mobility of female adult subjects with and without patellofemoral pain (PFP).
  
  
  BACKGROUND
  Although abnormal patellar mobility is believed to be one of the causes of PFP, there is currently no published evidence to support this contention. In part, this lack of evidence is because a reliable clinical measurement method to measure patellar mobility and objective criteria to define abnormal patellar mobility have not been established.
  
  
  METHODS
  The study sample was comprised of 22 females with PFP (PFP group) and 22 females who had no knee pain (control group), matched by age, height, and body mass index to the subjects with PFP. Patellar mobility was measured objectively using a specially designed apparatus. Measurements of lateral and medial patellar displacement, patellar mobility balance (lateral minus medial patellar displacement), lateral patellar mobility index (lateral patellar displacement divided by patellar width), and medial patellar mobility index (medial patellar displacement divided by patellar width) were used.
  
  
  RESULTS
  Lateral and medial patellar mobility values were not significantly different between the individuals in the PFP and control groups. When normal patellar mobility was arbitrarily defined as the average mobility +/- 2 SDs, based on the data from the control group, normal lateral patellar displacement was within a range of 7.2 to 17.6 mm and normal medial patellar displacement was within a range of 6.8 to 14.0 mm. The intraclass correlation coefficient for intratester and intertester reliability of lateral and medial patellar displacement measurements varied from 0.80 to 0.97.
  
  
  CONCLUSIONS
  Although there were no significant differences in patellar mobility between females with and without PFP, these measurements give reference information about normal patellar mobility for this group.
  
  
  METHODS
  Diagnosis, level 5.
authors.affiliation: Department of Physical Therapy, School of Health Sciences, Nagoya University, Aichi, Japan. s-ota@met.nagoya-u.ac.jp
authors.forename: Susumu
authors.initials: S
authors.lastname: Ota
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nakashima
authors.forename: Ayako
authors.initials: A
authors.lastname: Morisaka
authors.forename: Kunio
authors.initials: K
authors.lastname: Ida
authors.forename: Morio
authors.initials: M
authors.lastname: Kawamura
mesh_terms: D000328:Adult; D004867:Equipment Design; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology*; D009983:Orthopedic Equipment / Q000592:standards*; D010329:Patella / Q000503:physiopathology*; D046788:Patellofemoral Pain Syndrome / Q000503:physiopathology*; D016059:Range of Motion, Articular / Q000502:physiology*; D015203:Reproducibility of Results; D012189:Retrospective Studies