title: Wrist electrogoniometry: are current mathematical correction procedures effective in reducing crosstalk in functional assessment?
abstract: BACKGROUND
  The recording of human movement is an essential requirement for biomechanical, clinical, and occupational analysis, allowing assessment of postural variation, occupational risks, and preventive programs in physical therapy and rehabilitation. The flexible electrogoniometer (EGM), considered a reliable and accurate device, is used for dynamic recordings of different joints. Despite these advantages, the EGM is susceptible to measurement errors, known as crosstalk. There are two known types of crosstalk: crosstalk due to sensor rotation and inherent crosstalk. Correction procedures have been proposed to correct these errors; however no study has used both procedures in clinical measures for wrist movements with the aim to optimize the correction.
  
  
  OBJECTIVE
  To evaluate the effects of mathematical correction procedures on: 1) crosstalk due to forearm rotation, 2) inherent sensor crosstalk; and 3) the combination of these two procedures.
  
  
  METHODS
  43 healthy subjects had their maximum range of motion of wrist flexion/extension and ulnar/radials deviation recorded by EGM. The results were analyzed descriptively, and procedures were compared by differences.
  
  
  RESULTS
  There was no significant difference in measurements before and after the application of correction procedures (P<0.05). Furthermore, the differences between the correction procedures were less than 5° in most cases, having little impact on the measurements.
  
  
  CONCLUSIONS
  Considering the time-consuming data analysis, the specific technical knowledge involved, and the inefficient results, the correction procedures are not recommended for wrist recordings by EGM.
authors.affiliation: Physical Therapy Department, Universidade Federal de São Carlos (UFSCar), São Carlos, SP, Brazil.
authors.forename: Fabiana A
authors.initials: FA
authors.lastname: Foltran
authors.forename: Luciana C C B
authors.initials: LC
authors.lastname: Silva
authors.forename: Tatiana O
authors.initials: TO
authors.lastname: Sato
authors.forename: Helenice J C G
authors.initials: HJ
authors.lastname: Coury
mesh_terms: D053587:Arthrometry, Articular / Q000706:statistics & numerical data*; D016477:Artifacts; D001696:Biomechanical Phenomena; D003951:Diagnostic Errors; D005260:Female; D006801:Humans; D008297:Male; D008433:Mathematics; D014955:Wrist Joint / Q000502:physiology*; D055815:Young Adult