MIGHTYMITE 4-BAR KNEE INSTRUCTION SHEET 2710 Amnicola Highway Chattanooga, TN 37406 423.624.0946 Fax 423.629.7936 Description MightyMite 4-Bar Knee 30mm Bolt for Pyramid Attachment 20mm Bolt for Slide Attachment 20mm Bolt for 4-Hole Attachment 20mm Bolt for Threaded Attachment Extension Spring Housing Extension Stop Spring, .210” long Extension Stop Spring, .220” long Spring Guide Extension Assist Spring Color Resistance PartNo. Orange Less 61643 Yellow 61644 Green 61645 Blue More 61646 Extension Assist Spring 61643 through 61646 Note: Assembly shown above is part number FC100510, which includes the MightyMite Knee (FC100500) and the Pyramid Attachment (FC100501).

Ischial Mark 5 degree Flexion (In addition to Hip Flexion Contracture) Medial Bisection Plumb Line Socket Bisection Attachment 15mm Anterior More anterior = more stability Knee Center Height Bisect Heel 1/4" Airspace Under Shoe 1/4" Airspace Under Shoe 1) Sagittal Alignment: a) Preflex interface 5 degrees more than measured hip flexion contracture (if any). b) Place ¼” airspace under heel of shoe. c) Find Medial Bisection of interface and use plumb line to project distally. d) Zero pyramid adjustments at ankle. e) Medial Bisection Plumb Line should bisect ankle attachment. f) Centerline of knee...

Proximal Attachment Extension/Flexion Friction Adjustment Proximal Attachment Bolt/ Rotation Adjustment 22mm Tube Clamp Adaptor 4) Adjust Initial Flexion Stability: Extension Assist a) Observe patient in parallel bars and flex knee. Spring Housing b) If more stability is needed, first plantarflex foot slightly. c) If still more stability is required, shift interface anterior. 5) Extension/Flexion Friction Adjustment: a) Set Extension/Flexion Friction Adjustment to limit heel rise and terminal impact. b) Selection of extension assist spring will also affect swing rate. 6) Rotation Adjustments:...

9) Replace/Exchange Urethane Bumper a) Remove the Proximal Adaptor. b) Remove Posterior Link set screw using a 3/32” wrench. c) Hyperflex knee as shown below and push out posterior proximal axle. d) Rotate knee top forward as shown to the right. e) Pry out plunger carefully. f) Remove the urethane spring and slide in the new one. Urethane springs are supplied in two lengths. The longer spring (61697) may be required for high activity levels or where stiffer extension springs are fitted. g) Replace the plunger and rotate the knee top back into hyperflexed position h) Line up the shaft holes and...