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- Dokumenttyp:
- Journal Article; Research Support, Non-U.S. Gov't
- Autor(en):
- Voss, Andreas; Beitzel, Knut; Obopilwe, Elifho; Buchmann, Stefan; Apostolakos, John; Di Venere, Jessica; Nowak, Michael; Cote, Mark P; Romeo, Anthony A; Mazzocca, Augustus D
- Titel:
- No correlation between radiolucency and biomechanical stability of keeled and pegged glenoid components.
- Abstract:
- The purpose of this study was to examine biomechanical properties and the degree of radiolucency of two cemented basic glenoid designs for total shoulder arthroplasty. Our hypothesis was that a component with increased micro-motion in the laboratory at time zero would also exhibit a greater amount of radiolucency in patients at a minimum of 2 years post total shoulder arthroplasty.Thirty cadaveric shoulders were divided into 2 groups (keel vs. peg). The glenoid components were first loaded with a single axial eccentric force of 196 N in all orientations and then with a transversal load of 49 N to simulate in vivo loads with abduction. Displacement of the glenoid component was determined with four different linear variable-differential transducers. In the second phase, 56 antero-posterior x-rays of 52 patients with either the same keeled (n = 24) or pegged (n = 32) glenoid component with a minimum of 24 months follow-up were evaluated for radiolucency.Biomechanically the pegged glenoid showed a significant increase in micro-motion during eccentric axial loading as well as during combined loading in the anterior, posterior, and inferior position as compared to the keeled glenoid (p < 0.05). In contrast all results were significant with greater radiolucency for the keeled glenoid component (p = 0.001).While the pegged component exhibited a greater amount of micro-motion during biomechanical testing, radiolucency was greater in patients with a keeled component. These findings provide support for both components from different perspectives and highlight the need for well-constructed studies to determine whether glenoid design has an effect on clinical outcome, because influences are multifactorial and biomechanical forces may not recreate forces seen in vivo.
- Zeitschriftentitel:
- BMC Musculoskelet Disord
- Jahr:
- 2017
- Band / Volume:
- 18
- Heft / Issue:
- 1
- Seitenangaben Beitrag:
- 213
- Sprache:
- eng
- Volltext / DOI:
- doi:10.1186/s12891-017-1550-0
- PubMed:
- http://view.ncbi.nlm.nih.gov/pubmed/28545494
- Print-ISSN:
- 1471-2474
- TUM Einrichtung:
- Fachgebiet Sportorthopädie (Prof. Imhoff)
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