Preliminary study of optimal measurement location on vibroarthrography for classification of patients with knee osteoarthritis.
[Purpose] The aims of the present study were to investigate the most suitable location for vibroarthrography measurements of the knee joint to distinguish a healthy knee from knee osteoarthritis using Wavelet transform analysis. [Subjects and Methods] Participants were 16 healthy females and 17 females with severe knee osteoarthritis. Vibroarthrography signals were measured on the medial and lateral epicondyles, mid-patella, and tibia using stethoscopes with a microphone while subjects stood up from a seated position. Frequency and knee flexion angles at the peak wavelet coefficient were obtained. [Results] Peak wavelet coefficients at the lateral condyle and tibia were significantly higher in patients with knee osteoarthritis than in the control group. Knee joint angles at the peak wavelet coefficient were smaller (more extension) in the osteoarthritis group compared to the control group. The area under the receiver operating characteristic curve on tibia assessment with the frequency and knee flexion angles was higher than at the other measurement locations (both area under the curve: 0.86). [Conclusion] The tibia is the most suitable location for classifying knee osteoarthritis based on vibroarthrography signals.
Department of Rehabilitation and Care, Seijoh University: 2-172 Fukinodai, Tokai, Aichi 476-8588, Japan.
Susumu
S
Ota
Department of Physical Therapy, School of Health Sciences, Nagoya University, Japan.
Akiko
A
Ando
Department of Mechanical Engineering, Graduate School of Science and Engineering, Tokyo Metropolitan University, Japan.
Yusuke
Y
Tozawa
Department of Physical Therapy, School of Health Sciences, Nagoya University, Japan.
Takuya
T
Nakamura
Department of Mechanical Sciences and Engineering, Graduate School of Engineering, Nagoya University, Japan.
Shogo
S
Okamoto
Graduate School of Science and Engineering, Saitama University, Japan.
Takenobu
T
Sakai
Department of Mechanical Engineering, Graduate School of Science and Engineering, Tokyo Metropolitan University, Japan.
Kazunori
K
Hase
Knee osteoarthritis; Vibroarthrography; Wavelet transform analysis