BACKGROUND AND PURPOSE: Bone-anchored titanium implants have been used for anchorage of amputation prostheses for more than one and a half decades. Histo-logical and ultrastructural analyses were performed on a forearm amputation prosthesis after being in use for more than 11 years. MATERIAL, METHODS AND RESULTS: The implant was retrieved from the ulnar bone after a fatigue fracture of the titanium implant, and was clinically stable at the time of removal. The histological findings showed a large amount of bone within the threads and a high degree of apposition of mineralized bone to the implant surface. Ultrastructural analysis of thin samples prepared by focused ion-beam microscopy revealed an electron-dense layer at the interface and direct apposition of crystalline hydroxyapatite at the implant surface. INTERPRETATION: Our observations in this retrieval study provide a structural correlate to the functional properties and clinical results of amputation prostheses.
BACKGROUND AND PURPOSE: Bone-anchored titanium implants have been used for anchorage of amputation prostheses for more than one and a half decades. Histo-logical and ultrastructural analyses were performed on a forearm amputation prosthesis after being in use for more than 11 years. MATERIAL, METHODS AND RESULTS: The implant was retrieved from the ulnar bone after a fatigue fracture of the titanium implant, and was clinically stable at the time of removal. The histological findings showed a large amount of bone within the threads and a high degree of apposition of mineralized bone to the implant surface. Ultrastructural analysis of thin samples prepared by focused ion-beam microscopy revealed an electron-dense layer at the interface and direct apposition of crystalline hydroxyapatite at the implant surface. INTERPRETATION: Our observations in this retrieval study provide a structural correlate to the functional properties and clinical results of amputation prostheses.
Authors: Venkata P Mantripragada; Beata Lecka-Czernik; Nabil A Ebraheim; Ambalangodage C Jayasuriya Journal: J Biomed Mater Res A Date: 2013-06-14 Impact factor: 4.396
Authors: Anders Palmquist; Sara H Windahl; Birgitta Norlindh; Rickard Brånemark; Peter Thomsen Journal: Acta Orthop Date: 2014-05-05 Impact factor: 3.717
Authors: Furqan A Shah; Patrik Stenlund; Anna Martinelli; Peter Thomsen; Anders Palmquist Journal: J Mater Sci Mater Med Date: 2016-10-03 Impact factor: 3.896