title: Impaired tensile strength after shock-wave application in an animal model of tendon calcification.
abstract: Extracorporeal shock-wave application facilitates dissolution of rotator cuff calcifications. Therefore, disappearance or disintegration of tendon calcifications by shock waves might be appropriate for any kind of tendon calcification. Here, shock waves with various energy flux densities were applied to the mineralized medial gastrocnemius tendon of turkeys as an animal model. After application of shock waves in vivo, with energy flux density of 0.6 mJ/mm(2), histologic examination and microradiography did not show dissolution or disintegration of tendon calcifications. After shock-wave application in vitro, even for energy flux density of 1.2 mJ/mm(2) neither dissolution nor disintegration of tendon calcifications were observed. Biomechanical testing revealed significant impairment of tensile strength following shock-wave application in vitro, with energy flux density of 1.2 mJ/mm(2), but not with 0.6 mJ/mm(2). These results are important for considerations of clinical extracorporeal shock-wave application on tendon calcifications, as well as on tendon ossifications.
authors.affiliation: Department of Orthopaedic Surgery, University of Munich, Munich, Germany. markus.maier@ort.med.uni-muenchen.de
authors.forename: M
authors.initials: M
authors.lastname: Maier
authors.forename: T
authors.initials: T
authors.lastname: Saisu
authors.forename: J
authors.initials: J
authors.lastname: Beckmann
authors.forename: M
authors.initials: M
authors.lastname: Delius
authors.forename: F
authors.initials: F
authors.lastname: Grimm
authors.forename: V
authors.initials: V
authors.lastname: Hupertz
authors.forename: S
authors.initials: S
authors.lastname: Milz
authors.forename: A
authors.initials: A
authors.lastname: Nerlich
authors.forename: H J
authors.initials: HJ
authors.lastname: Refior
authors.forename: C
authors.initials: C
authors.lastname: Schmitz
authors.forename: F
authors.initials: F
authors.lastname: Ueberle
authors.forename: C
authors.initials: C
authors.lastname: Weiler
authors.forename: K
authors.initials: K
authors.lastname: Messmer
mesh_terms: D000818:Animals; D002114:Calcinosis / Q000000981:diagnostic imaging* / Q000473:pathology / Q000628:therapy*; D004195:Disease Models, Animal; D008297:Male; D013710:Tendons / Q000000981:diagnostic imaging* / Q000473:pathology; D013718:Tensile Strength / Q000528:radiation effects; D014422:Turkeys; D014464:Ultrasonic Therapy / Q000009:adverse effects*; D014463:Ultrasonography