Proprioception Testing Device Lee C. Groeneweg, EGR Thomas A. Farley, EGR Steve Brodnicki, SPT Ryane Eno, SPT Mike Terrell, SPT

Definition of Proprioception Joint position sense without visual input Measurements help inform physical therapist of patient’s ability to determine limb location in space Also helpful in determining whether therapy interventions are necessary

Project Overview Device to isolate and measure internal and external rotation of shoulder joint Internal Shoulder Rotation External Shoulder Rotation

Statement of Need Device to isolate and measure internal and external rotation of shoulder joint Must measure degrees similar to physical therapist’s goniometer Test position must be self restraining (Locking)

Project Specifications Isolation and measurement of shoulder internal and external rotation Position of body - lying down on table No computer technology Easily used in a clinical setting Portable and light Measurement in degrees Inexpensive Test position must be self restraining (Locking)

Design Constraints Patient positioned lying on back Shoulder blade must be immobilized Upper arm positioned 90° to body restrained allowing longitudinal motion in a resting position Elbow must be positioned 90° to upper arm

Prototype Stage Discuss ideas 2-D CAD drawings Foam poster board Convey 3-D concept Receive approval

Production Stage Approval of prototype design Updated 2-D CAD drawings Process plan for manufacturing Obtain material Manufacture parts Assemble parts for fit Test for proper function

Materials of Choice Aluminum Plastic Standard Fasteners Camera Tripod Mini Laser Pointers Ergonomic Knob

Manufactured Parts Base Plate Slider Brackets (2) Pivot bracket Upper Laser pen holder Lower laser Pen Holder Armature

Manufacturing Process Plan Base Plate Cut to rough size on band saw Machined to finished size on vertical mill Holes drilled using vertical mill Slots machined using 4 flute 1/4" cutter on vertical mill Surface finished with manual disk grinder to remove all surface imperfections

Manufacturing Process Plan Slider Brackets (2) Cut to rough size on band saw Machined to finished size on vertical mill Holes drilled using vertical mill Slots machined using 4 flute 1/4" cutter on vertical mill Threads hand tapped

Manufacturing Process Plan Pivot Bracket Cut to rough size on band saw Machined to finished size on vertical mill Holes drilled using vertical mill Counter bored holes machined using 4 flute 1/2" cutter on vertical mill

Manufacturing Process Plan Upper Laser Pen Holder Cut to size on band saw Holes drilled using drill press Lower Laser Pen Holder

Manufacturing Process Plan Armature Machined to finished size on vertical mill Holes drilled using vertical mill Slots machined using 4 flute 1/4" cutter on vertical mill

Features & Benefits Adjustable for multiple users Lightweight materials Fully Collapsible Portable while assembled Design is a baseline for future devices

Demonstration of Proprioception Blind fold individual Place the limb into a test position Hold in test position for a few seconds Record angle of test position Return to starting position Patient places limb into the testing position Record angle of repeated attempt

Q and A Session Lee C. Groeneweg, EGR Thomas A. Farley, EGR Steve Brodnicki, SPT Ryane Eno, SPT Mike Terrell, SPT For addt’'l project info: http://www.eod.gvsu.edu/~groenelc/MnfgProcess/EGR367.html