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KMID : 0359620170290040302
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Journal of Korean Knee Society
2017 Volume.29 No. 4 p.302 ~ p.306
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Measurement of Knee Rotation Angles Using a Smartphone Application: An Experimental Study of Porcine Knees
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Kim Hee-June
Lee Hyun-Joo
Shin Ji-Yeon
Choi Young-Seo
Kyung Hee-Soo
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Abstract
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Purpose: This study evaluated the efficacy of a smartphone application in the measurement of rotation angles in porcine knees.
Materials and Methods: Two K-wires were fixated to the femoral condyle and anterior tibial crest of 10 porcine legs. The angle created between the K-wires with an external rotation force applied was measured on a photograph and defined as the true angle. The same force was applied to the legs placed on a splint with a smartphone attached to the plantar side. The angle presented on a smartphone application was determined as the measured angle. The differences between the true and measured angles in 30° and 90° knee flexion and differences in measured angles depending on the status of the popliteus tendon were compared.
Results: In the intact knees, the mean true angles in 30° and 90° flexion were 20.5°±1.4° and 19.1°±1.3°, respectively, and the mean measured angles in 30° and 90° flexion were 21.1°±0.9° and 18.6°±1.6°, respectively. When the popliteus tendon was cut, the mean true angles in 30° and 90° flexion were 31.4°±1.1° and 38.5°±2.5°, respectively, and the mean measured angles in 30° and 90° flexion were 31.8°±1.2° and 39.2°±2.8°, respectively. The differences between the true and measured angles were not significant. The measured angle increased by more than 10° after cutting of the popliteus tendon in both 30° and 90° flexion.
Conclusions: Using a smartphone application could be a good method of measuring knee rotation.
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KEYWORD
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Knee, Rotation, Smartphone, Mobile application
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