USGA Ruling: As of March 31, 2009, the use of these 2.5 or 5.0 degree sloped cushion wedged insoles are included on the List of Equipment Permitted Conditionally for Medical Reasons. They are “Permissible when the local committee authorizes its use under the List of Equipment Permitted Conditionally for Medical Reasons and/or Exception 1 to Rule 14-3.”
The loads on the knee joint in golf heretofore were not a focus of attention. Direct measurement of the loads with a novel electronic knee at the Scripps Institute showed the loads to be surprisingly high even at slow club head speeds. The presumption of higher swing speeds causing greater loads is anticipated. Results showed the benefit of use of soft spikes, Golf Specific shoe insoles to be independently effective in unloading the back knee of the right handed golfer during all phases of the golf swing.
The independent use of an unloader knee brace was not effective, but when used in combination with the Golf Specific insole reduced the force of impact on the lateral compartment of the back knee by 56%.