Quantitative assessment of pivot-shift using inertial sensors View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2012-01-06

AUTHORS

Nicola Lopomo, Cecilia Signorelli, Tommaso Bonanzinga, Giulio Maria Marcheggiani Muccioli, Andrea Visani, Stefano Zaffagnini

ABSTRACT

PurposeThe pivot-shift phenomenon has been identified to be one of the essential signs of functional anterior cruciate ligament (ACL) insufficiency. However, the pivot-shift test remains a surgeon-subjective examination, lacking a general recognized quantitative measurement. The goal of the present study was to validate the use of an inertial sensor for quantifying the pivot-shift test, using a commercial navigation system.MethodsAn expert surgeon intra-operatively performed the pivot-shift test on 15 consecutive patients before ACL reconstruction. A single accelerometer and a commercial navigation system simultaneously acquired limb kinematics. An additional optical tracker mounted on the accelerometer allowed following sensor movements. Anteroposterior (a-p) tibial acceleration obtained with the navigation system was compared with three-dimensional (3D) acceleration acquired by the accelerometer. The effect of skin artifacts and test–retest positioning were estimated. Repeatability of the acceleration parameter and waveform was analyzed. Correlation between the two measurements was also assessed.ResultsAverage root mean square (RMS) error in test–retest positioning reported a good value of 5.5 ± 2.9 mm. Mean RMS displacement due to soft tissue artifacts was 4.9 ± 2.6 mm. The analysis of acceleration range repetitions reported a good intra-tester repeatability (Cronbach’s alpha = 0.86). Inter-patients similarity analysis showed a mean acceleration waveform correlation of 0.88 ± 0.14. The acceleration ranges demonstrated a good positive correlation between the two measurements (rs = 0.72, P < 0.05).ConclusionThis study showed good reliability of the new device and good correlation with the navigation system results. Therefore, the accelerometer is a valid method to assess dynamic joint laxity.Level of evidence II. More... »

PAGES

713-717

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00167-011-1865-6

DOI

http://dx.doi.org/10.1007/s00167-011-1865-6

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1000369280

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/22222615


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69 good positive correlation
70 good reliability
71 inertial sensors
72 insufficiency
73 joint laxity
74 kinematics
75 laxity
76 levels
77 ligament insufficiency
78 limb kinematics
79 mean square error
80 measurements
81 method
82 movement
83 navigation system
84 new device
85 optical tracker
86 parameters
87 patients
88 phenomenon
89 pivot shift test
90 pivot-shift phenomenon
91 positioning
92 positive correlation
93 present study
94 quantitative assessment
95 quantitative measurements
96 range
97 reconstruction
98 reliability
99 repeatability
100 repetition
101 results
102 root mean square error
103 sensor movement
104 sensors
105 signs
106 similarity analysis
107 single accelerometer
108 skin artifacts
109 soft tissue artifacts
110 square error
111 study
112 surgeons
113 system
114 system results
115 test
116 three-dimensional acceleration
117 tibial acceleration
118 tissue artifacts
119 tracker
120 use
121 valid method
122 values
123 waveform correlation
124 waveforms
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