Indentation instrument for the measurement of cartilage stiffness under arthroscopic control

✍ Scribed by T. Lyyra; J. Jurvelin; P. Pitkänen; U. Väätäinen; I. Kiviranta

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 775 KB
• Volume: 17
• Category: Article
• ISSN: 1350-4533
• DOI: 10.1016/1350-4533(95)97322-g

✦ Synopsis

ABSTFtACT (~'hnnge.s in the biomechanical prop&es of nrtirular rurtilrq are one oj the.jrst signs qf the tissue degeneralion. We have developed a small size indentalion instrument for the quantiJcntion oJcartilage stiffness under arthroscopir rontrol. Du,l-ing measurement, the indenter imposes n constant defiation on the cartilage and the maximal indenter /on-e, by which the cartilage resists the akjkmation, is used ns a meusure for cartilage sti@ess. The instrument has been tested in ~bor~to~ conditions with e~~i~~i~ and cadaver knee joint cmf.ilage samples. A &ear re~~t~i~n,,~hi~ was ~ol~n.~ ~~et~~een. ~ndent~~~ce and el~sta?n~ .~t~~~~~ess fr = ll.990, n = 14) as we& as betwe~ ~~ld~.t~~~~re and cartilage shear modulus obtained by a ref?renre deuire (I-= 0.879, of = 22). Also, the rmre&ion between fwo repealed mm.curemmts at the measurement sites. used to evaluate the rejnoducibility, was linear (r = 0.953, n = 161. Qunntitntiue deterlion of rartilage

s@fkxs is possible with the in.rtrument.