A new technique for the radiostereometric analysis of soft tissues

Abstract Background Interest in soft tissue RadioStereometric Analysis (RSA) is rising. Previous studies have attempted to use this technique to analyse anterior cruciate ligament (ACL) graft constructs, and more recently, the movement of soft tissue as a precursor to RSA follow up of rotator cuff r...

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Bibliographic Details
Published in:Journal of biomechanics 2012-11, Vol.45 (16), p.2931-2934
Main Authors: Ashmore, A.M, Rout, R, Beard, D.J, Price, A.J, Murray, D.W, Gill, H.S
Format: Article
Language:English
Subjects:
Animals
Anterior Cruciate Ligament - diagnostic imaging
Anterior Cruciate Ligament - transplantation
Beads
Biological and medical sciences
Cattle
Data collection
Elasticity
Experiments
Fundamental and applied biological sciences. Psychology
Investigative techniques, diagnostic techniques (general aspects)
Marker balls
Marker beads
Markers
Mathematical models
Medical sciences
Osteoarticular system. Muscles
Physical Medicine and Rehabilitation
Radiodiagnosis. Nmr imagery. Nmr spectrometry
Radiostereometric analysis
Radiostereometric Analysis - methods
RSA
Soft tissues
Soft-tissue
Striated muscle. Tendons
Surgical implants
Sutures
Tantalum
Tendons
Transplants
Transplants & implants
Vertebrates: osteoarticular system, musculoskeletal system
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Summary:Abstract Background Interest in soft tissue RadioStereometric Analysis (RSA) is rising. Previous studies have attempted to use this technique to analyse anterior cruciate ligament (ACL) graft constructs, and more recently, the movement of soft tissue as a precursor to RSA follow up of rotator cuff repairs. These methods were either prone to large amounts of marker migration, deemed unsuitable for in vivo use or, where alternative markers such as stainless steel sutures were used, lost the inherent accuracy that makes RSA an attractive tool in the first place. We describe a modification of tantalum marker balls that allows for immediate secure fixation to soft tissue in order to accurately analyse stretch and displacement of soft tissues using RSA. Methods 1.5 mm tantalum marker balls were converted to marker beads by pre-drilling with 0.3 mm holes, allowing them to be sutured directly to soft tissue. Using an established ACL graft model, the amount of marker micro-motion was then analysed by RSA after cyclical loading between 20 N and 170 N at 25 Hz for 225,000 cycles. Findings None of 40 marker beads loosened or became detached after 225,000 cycles. Mean micro-motion of the markers was
ISSN:0021-9290
1873-2380
DOI:10.1016/j.jbiomech.2012.09.001