Preliminary study of optimal measurement location on vibroarthrography for classification of patients with knee osteoarthritis.
Susumu Ota, Akiko Ando, Yusuke Tozawa and 4 others
PMID 27821959WHAT IT FOUND
When listening to knee sounds as someone stands up, placing the sensor on the tibia separated severe knee osteoarthritis from healthy knees better than the other measured locations.
This is a preliminary measurement-location study, not a diagnostic test.
Key findings
01The tibia had the highest area under the curve values for frequency and angle, 0.86 for each.
02At the tibia, peak frequency was 176.9 Hz in the osteoarthritis group and 122.2 Hz in the control group.
03At the tibia, the knee angle at the strongest signal was 37.5 degrees in the osteoarthritis group and 62.3 degrees in the control group.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study was small and preliminary, with 16 healthy controls and 17 patients with knee osteoarthritis, all women. The groups were very different, healthy young adults versus patients with severe knee osteoarthritis, so it does not show how the measurement works in early or moderate disease. The measurement system was custom-made and the study did not compare validity data as in some previous vibroarthrography studies. The knee sounds were recorded from four locations at once, so the source of the signal within the knee could not be identified. One results sentence about knee angle conflicts with the tables and Discussion, so the angle finding is unclear.
The easy way to misread this
Do not use this to place a sensor on patients or diagnose knee osteoarthritis. The study was a preliminary test in young healthy adults and patients with severe knee osteoarthritis. It did not compare validity data as in some previous vibroarthrography studies. The angle results are also inconsistent between the text and tables.