title: A novel, resorbable suture anchor: pullout strength from the human cadaver greater tuberosity.
abstract: The pullout strength of a collagen bone anchor that creates interference fixation as the result of radial swelling on hydration was compared with a Mitek rotator cuff anchor after insertion into the greater tuberosity of human cadaver humeri. Bones were fully hydrated at 37 degrees C. Stiffness, peak load, and the mode of failure were recorded. Real and apparent bone densities were measured. Peak load for the collagen anchor at 15 minutes (121.0N +/- 81.3N) was greater than at 2 minutes (60.5N +/- 38.5N) after insertion (P <.05). At between 5 and 60 minutes after insertion, peak loads for the Mitek and the collagen anchors did not differ. After 30 minutes from insertion, the mode of failure of the collagen anchor changed from pullout with minor body damage to pullout with major body damage. Peak load at pullout correlated with bone density for the Mitek (P <.05, r = 0.516) but for the collagen bone anchor appeared unaffected by bone density.
authors.affiliation: University of New South Wales, Orthopaedic Research Laboratory, Prince of Wales Hospital, Sydney, Australia.
authors.forename: R E
authors.initials: RE
authors.lastname: Stanford
authors.forename: J
authors.initials: J
authors.lastname: Harrison
authors.forename: J
authors.initials: J
authors.lastname: Goldberg
authors.forename: D H
authors.initials: DH
authors.lastname: Sonnabend
authors.forename: M
authors.initials: M
authors.lastname: Alvis
authors.forename: W R
authors.initials: WR
authors.lastname: Walsh
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001672:Biocompatible Materials; D001843:Bone Cements; D002102:Cadaver; D003094:Collagen; D004868:Equipment Failure; D005260:Female; D006801:Humans; D008297:Male; D008422:Materials Testing; D008875:Middle Aged; D016059:Range of Motion, Articular; D017006:Rotator Cuff / Q000473:pathology / Q000601:surgery*; D012785:Shoulder Joint / Q000473:pathology / Q000601:surgery*; D013537:Sutures; D013718:Tensile Strength; D014867:Water
chemical_list: D001672:Biocompatible Materials; D001843:Bone Cements; D014867:Water; D003094:Collagen