Reliability of measurement of elastomer samples by soft tissue stiffness meter

Akira Takanashi, Hiroshi Karasuno, Munenori Katou, Ryo Konuma, Kotomi Shiota, Tadamitsu Matsuda, Shigeki Miyajima, Noboru Sakanoue, Masataka Hosoda, Junya Aizawa, Kouji Isosaki, Kouji Otsu

Research output: Contribution to journalArticlepeer-review


Purpose: We assessed the TK-03C soft tissue stiffness meter (STSM) (Tokushukeisoku Corporation, Japan) for inter/intra-rater reliability. This device measures load and displacement simultaneously. Subjects: Ten students from the Physical Therapy Department were the subjects. Methods: The 10 subjects measured the surface stiffness of three elastomer samples with known mechanical properties: a polyurethane test piece and two sorbos test pieces. They each took 7 consecutive readings using the STMS at the same site on each test piece. We calculated the displacement for a load of 10 N. Result: The overall rating reliability for all sites was high: site1, coefficient of variation (CV) (range)=5.3 (2.6-10.0); site2, CV=3.9 (2.3-6.1); site3, CV=5.0 (2.2-9.2). The intra-rater reliability of the 10 subjects was high showing an intra-class correlation coefficient (ICC) (1•1) ≥0.97. The inter-rater reliability was also high; ICC(2•1)=0.96. In addition, the hardness of the three test pieces were significantly different (p<0.01). Conclusion: It seems that this STSM is a reliable and useful device for objective quantitative evaluation of soft tissue stiffness.

Original languageEnglish
Pages (from-to)31-34
Number of pages4
JournalRigakuryoho Kagaku
Issue number1
Publication statusPublished - 2009
Externally publishedYes


  • Reliability
  • Soft tissue stiffness
  • Soft tissue stiffness meter

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation


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