Internal Fixation of Type-C Distal Femoral Fractures in Osteoporotic Bone by Dirk Wähnert, Konrad L. Hoffmeier, Geert von Oldenburg, Rosemarie Fröber,

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Presentation transcript:

Internal Fixation of Type-C Distal Femoral Fractures in Osteoporotic Bone by Dirk Wähnert, Konrad L. Hoffmeier, Geert von Oldenburg, Rosemarie Fröber, Gunther O. Hofmann, and Thomas Mückley J Bone Joint Surg Am Volume 92(6): June 1, 2010 ©2010 by The Journal of Bone and Joint Surgery, Inc.

Distal interlocking patterns of the devices used in this study. a: T2 Femoral Nail (T2). b: Supracondylar Nail (SCN). c: Distal Femoral Nail (DFN). d: Angular stable plate (AxSOS). Dirk Wähnert et al. J Bone Joint Surg Am 2010;92: ©2010 by The Journal of Bone and Joint Surgery, Inc.

Schematic of the fracture model (AO/ASIF type 33-C2) that was used in this study. Dirk Wähnert et al. J Bone Joint Surg Am 2010;92: ©2010 by The Journal of Bone and Joint Surgery, Inc.

Test setup showing eccentric loading of the specimen, with 1 indicating the upper universal joint; 2, proximal fixation; 3, anatomic axis; 4, mechanical axis; 5, a specimen; 6, distal fixation with polyethylene insert and cage; and 7, the lower universal jo... Dirk Wähnert et al. J Bone Joint Surg Am 2010;92: ©2010 by The Journal of Bone and Joint Surgery, Inc.

Torsional stiffness of the constructs used in the synthetic bone model, with the values given as the mean and the standard deviation. Dirk Wähnert et al. J Bone Joint Surg Am 2010;92: ©2010 by The Journal of Bone and Joint Surgery, Inc.

Range of motion (ROM) and neutral zone (NZ) of the constructs used in the synthetic bone model, with the values given as the mean and the standard deviation. Dirk Wähnert et al. J Bone Joint Surg Am 2010;92: ©2010 by The Journal of Bone and Joint Surgery, Inc.

The initial axial stiffness of the constructs in the synthetic bone and in the human cadaveric bone model. Dirk Wähnert et al. J Bone Joint Surg Am 2010;92: ©2010 by The Journal of Bone and Joint Surgery, Inc.

The mean number of cycles to failure (≥5 mm of deformation) in the synthetic bone model. Dirk Wähnert et al. J Bone Joint Surg Am 2010;92: ©2010 by The Journal of Bone and Joint Surgery, Inc.

Failure modes in the incremental cyclic axial test (synthetic bone model). Dirk Wähnert et al. J Bone Joint Surg Am 2010;92: ©2010 by The Journal of Bone and Joint Surgery, Inc.

The mean number of cycles to failure (≥2.5 mm of deformation) of the SCN and the DFN constructs in the synthetic bone and in the human cadaveric bone model; the difference between the SCN and DFN constructs in the synthetic bone and between the SCN and DFN... Dirk Wähnert et al. J Bone Joint Surg Am 2010;92: ©2010 by The Journal of Bone and Joint Surgery, Inc.