TY - GEN
T1 - Structural and functional assessment of intense therapeutic ultrasound effects on partial Achilles tendon transection
AU - Barton, Jennifer K.
AU - Rice, Photini S.
AU - Howard, Caitlin C.
AU - Koevary, Jen W.
AU - Danford, Forest
AU - Gonzales, David A.
AU - Vande Geest, Jonathan P
AU - Latt, L. Daniel
AU - Szivek, John A.
AU - Amodei, Richard
AU - Slayton, Michael
N1 - Publisher Copyright:
© 2018 SPIE.
PY - 2018
Y1 - 2018
N2 - Tendinopathies and tendon tears heal slowly because tendons have a limited blood supply. Intense therapeutic ultrasound (ITU) is a treatment modality that creates very small, focal coagula in tissue, which can stimulate a healing response. This pilot study investigated the effects of ITU on rabbit and rat models of partial Achilles tendon rupture. The right Achilles tendons of 20 New Zealand White rabbits and 118 rats were partially transected. Twenty-four hours after surgery, ITU coagula were placed in the tendon and surrounding tissue, alternating right and left legs. At various time points, the following data were collected: ultrasound imaging, optical coherence tomography (OCT) imaging, mechanical testing, gene expression analysis, histology, and multiphoton microscopy (MPM) of sectioned tissue. Ultrasound visualized cuts and treatment lesions. OCT showed the effect of the interventions on birefringence banding caused by collagen organization. MPM showed inflammatory infiltrate, collagen synthesis and organization. By day 14-28, all tendons had a smooth appearance and histology, MPM and OCT still could still visualize residual healing processes. Few significant results in gene expression were seen, but trends were that ITU treatment caused an initial decrease in growth and collagen gene expression followed by an increase. No difference in failure loads was found between control, cut, and ITU treatment groups, suggesting that sufficient healing had occurred by 14 days to restore all test tissue to control mechanical properties. These results suggest that ITU does not cause harm to tendon tissue. Upregulation of some genes suggests that ITU may increase healing response.
AB - Tendinopathies and tendon tears heal slowly because tendons have a limited blood supply. Intense therapeutic ultrasound (ITU) is a treatment modality that creates very small, focal coagula in tissue, which can stimulate a healing response. This pilot study investigated the effects of ITU on rabbit and rat models of partial Achilles tendon rupture. The right Achilles tendons of 20 New Zealand White rabbits and 118 rats were partially transected. Twenty-four hours after surgery, ITU coagula were placed in the tendon and surrounding tissue, alternating right and left legs. At various time points, the following data were collected: ultrasound imaging, optical coherence tomography (OCT) imaging, mechanical testing, gene expression analysis, histology, and multiphoton microscopy (MPM) of sectioned tissue. Ultrasound visualized cuts and treatment lesions. OCT showed the effect of the interventions on birefringence banding caused by collagen organization. MPM showed inflammatory infiltrate, collagen synthesis and organization. By day 14-28, all tendons had a smooth appearance and histology, MPM and OCT still could still visualize residual healing processes. Few significant results in gene expression were seen, but trends were that ITU treatment caused an initial decrease in growth and collagen gene expression followed by an increase. No difference in failure loads was found between control, cut, and ITU treatment groups, suggesting that sufficient healing had occurred by 14 days to restore all test tissue to control mechanical properties. These results suggest that ITU does not cause harm to tendon tissue. Upregulation of some genes suggests that ITU may increase healing response.
KW - Achilles tendon
KW - Gene expression
KW - Healing response
KW - Intense therapeutic ultrasound
KW - Ultrasound
UR - http://www.scopus.com/inward/record.url?scp=85046822388&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85046822388&partnerID=8YFLogxK
U2 - 10.1117/12.2288525
DO - 10.1117/12.2288525
M3 - Conference contribution
AN - SCOPUS:85046822388
T3 - Progress in Biomedical Optics and Imaging - Proceedings of SPIE
BT - Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XVI
A2 - Vo-Dinh, Tuan
A2 - Grundfest, Warren S.
A2 - Mahadevan-Jansen, Anita
PB - SPIE
T2 - Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XVI 2018
Y2 - 28 January 2018 through 30 January 2018
ER -