Humerus Torsion Testing Methods: Humeri were potted in acry…

Humerus Torsion Testing Methods: Humeri were potted in acrylic at both ends Proximal end was held fixed. Torsional displacement at rate of 1 degree/sec was applied at the distal end until fracture occurred Gauge length = 60 mm (i.e. distance between MTS fixtures) Length to drill site from proximal (fixed) end = 20 mm The raw data you collect includes, time (seconds), extension (degrees of rotation at distal end), and moment (Newton*meters). Specimens were assigned to 2 groups Sample dimensions for each specimen are included in the text file provided. 2 humeri were tested following surgery using the All-Suture Suture Anchor (ASSA) Sample 1-2 Suture anchor dimensions for reference: 1.9 mm diameter, 3 mm length 2 humeri were testing following surgery using the Interference Screw (IS) Samples 3-4 Suture anchor dimensions for reference: 8.0 mm diameter, 2 mm length Data for each sample are recorded in a separate file, sample 1-4 and sample dimensions are provided in a separate file. Sample 1-2 is All-Suture Suture Anchor, sample 3-4 is Interference Screw. All data and an additional version of the images used in this problem can be found here.  Figure 2 A.) Orientation of the humerus in the testing apparatus. B.) Sketch of humerus in the potted ends with rotation applied to the distal end (top of image) and the proximal end being fixed. C.) Actual image of humerus in testing apparatus. Notes: Potting a bone is a common technique used to anchor a test sample with inconsistent contours in an MTS set up.  *Please see additional document provided at the beginning of the exam above for a higher quality image. 
Continue reading “Humerus Torsion Testing Methods: Humeri were potted in acry…”…