title: Assessment of waveform similarity in clinical gait data: the linear fit method.
abstract: The assessment of waveform similarity is a crucial issue in gait analysis for the comparison of kinematic or kinetic patterns with reference data. A typical scenario is in fact the comparison of a patient's gait pattern with a relevant physiological pattern. This study aims to propose and validate a simple method for the assessment of waveform similarity in terms of shape, amplitude, and offset. The method relies on the interpretation of these three parameters, obtained through a linear fit applied to the two data sets under comparison plotted one against the other after time normalization. The validity of this linear fit method was tested in terms of appropriateness (comparing real gait data of 34 patients with cerebrovascular accident with those of 15 healthy subjects), reliability, sensitivity, and specificity (applying a cluster analysis on the real data). Results showed for this method good appropriateness, 94.1% of sensitivity, 93.3% of specificity, and good reliability. The LFM resulted in a simple method suitable for analysing the waveform similarity in clinical gait analysis.
authors.affiliation: Clinical Laboratory of Experimental Neurorehabilitation, IRCCS Fondazione Santa Lucia, Via Ardeatina 306, 00179 Rome, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Iosa
authors.affiliation: Information Engineering Unit, POLCOMING Department, University of Sassari, Viale Mancini 5, 07100 Sassari, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Cereatti
authors.affiliation: Motion Analysis Laboratory, AUSL of Reggio Emilia, Rehabilitation Department, Via Circondaria 26, Reggio Emilia, 42015 Correggio, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Merlo
authors.affiliation: Motion Analysis Laboratory, AUSL of Reggio Emilia, Rehabilitation Department, Via Circondaria 26, Reggio Emilia, 42015 Correggio, Italy.
authors.forename: I
authors.initials: I
authors.lastname: Campanini
authors.affiliation: Clinical Laboratory of Experimental Neurorehabilitation, IRCCS Fondazione Santa Lucia, Via Ardeatina 306, 00179 Rome, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Paolucci
authors.affiliation: Interuniversity Centre of Bioengineering of the Human Neuromusculoskeletal System, Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", Piazza Lauro de Bosis 6, 00194 Rome, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Cappozzo
mesh_terms: D001696:Biomechanical Phenomena; D005684:Gait / Q000235:genetics / Q000502:physiology*; D006801:Humans; D009141:Musculoskeletal System / Q000503:physiopathology*; D010361:Patients