Fryette’s Laws Teaching Tool
Description
This teaching tool uses spherical cams to help visualize the coupled biomechanical movements that occur in the lumbar and thoracic spine during movement. See here for video and assembly sequence: https://youtu.be/jYGLIR5nwPY “Fryette’s Laws” are a set of guiding principles used by physiotherapists and practitioners of osteopathic medicine to discriminate between dysfunctions in the axial skeleton. The coupled movements can be tricky to visualize, and especially difficult to explain to patients. In this model, the central vertebrae represents the spine in neutral and demonstrates the first principle: “Principle I: When the spine is in neutral, sidebending to one side will be accompanied by horizontal rotation to the opposite side.” The front and back vertebrae represent the spine in flexion and extension respectively. These vertebrae demonstrate the second principle: “Principle II: When the spine is in a flexed or extended position (non-neutral), sidebending to one side will be accompanied by rotation to the same side.” See here for more details on Fryette’s Laws: https://en.wikipedia.org/wiki/Fryette%27s_laws Printing Print three “Gear” files and one of each of the remaining files. You'll need three 1/8" fine thread bolts, 3/4" in length. Refer to the video for assembly instructions, paying particular attention to proper orientation of the base. For the slots that hold the front and back vertebrae, the teeth should be on the back edge of the slot. For the slot that holds the central vertebrae, the teeth should be on the front edge of the slot. See here for another spherical cam project: https://www.thingiverse.com/thing:4884439 Here are more of my anatomical designs you might enjoy: Novelty: Wearable Spine: https://www.thingiverse.com/thing:4982223 Skull Jewelry Set: https://www.thingiverse.com/thing:4980129 Happy Halloween Spine: https://www.thingiverse.com/thing:4979522 Eyeball Windchime: https://www.thingiverse.com/thing:4978632 Fingerbone Windchime: https://www.thingiverse.com/thing:4962956 Skull Windchime: https://www.thingiverse.com/thing:4962814 Creepy Custom Embossed Spine: https://www.thingiverse.com/thing:4916377 Mini Articulating Spine Keychain: https://www.thingiverse.com/thing:4891846 Big Bowl O’ Back Bones: https://www.thingiverse.com/thing:4881377 Vertebral Stacking Blocks: https://www.thingiverse.com/thing:4868387 Anatomically Correct Voronoi Heart: https://www.thingiverse.com/thing:4636146 Vertebrae with Secret Compartment: https://www.thingiverse.com/thing:4633188 Brain Puzzle: https://www.thingiverse.com/thing:4158232 Anatomical Heart Puzzle: https://www.thingiverse.com/thing:4146688 Educational: 6-Piece Magnetic Female Pelvis Model: https://www.thingiverse.com/thing:4946668 Fryette’s Laws Teaching Tool: https://www.thingiverse.com/thing:4887712 Hip and Pelvis Model: https://www.thingiverse.com/thing:4875641 Flexible Three-Quarter Spine Model with Display Stand: https://www.thingiverse.com/thing:4863003 Full Size Anatomically Correct Human Foot Model: https://www.thingiverse.com/thing:4849504 Full Size Anatomically Correct Human Hand Model: https://www.thingiverse.com/thing:4841107 Full Size Anatomically-Correct 18-Piece Magnetic Human Skull Model: https://www.thingiverse.com/thing:4830026 Full-sized Anatomically Correct Articulating Spine: https://www.thingiverse.com/thing:4801717 Articulating Lumbar Vertebrae: https://www.thingiverse.com/thing:4637241
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