You can have a spring in your step but when it comes to springs in your shoes, that is quite a different matter. Appears the International Association of Athletic Federations(IAAF) and USA Track and Field (USATF) have banned their runners from competing in shoes with springs. The reason one can only assume is they consider that it gives an unfair advantage. An attestation if there ever was one, and will send the message loud and clear to the running fraternity. Talk about shooting yourself in the foot? Any runner who wins a race however governed by either organization's guidelines while wearing Spira running shoes is subject to disqualification. It seems more and more marathon athletes wearing the Spira running shoes are winning. Spira's™ patented WaveSpring™ technology produce insoles which have two metal springs, one near the toe area and the other near the heel.
Traditional shoe midsoles are made of foams, rubber compounds, or polymers but have much less recall than the spring insoles according to invitro tests conducted by Sports Biomechanics,Inc., Michigan State University. WaveSpring™ technology appears to have an infinite fatigue life and will last longer than the shoe. CEO of Spira running shoes has filed an antitrust lawsuit in U.S. District Court, suing the IAAF and USATF for $10 million. He claims their policies governing shoes with spring technologies have fostered a "restraint of competition." He claims a ban on the footwear creates a major marketing problem for Spira which obviously adversely affects his companies earning potetnial. If as it appears in runners' testimonials, Spira shoes effectively dampen shock (and impact on weightbearing joints)during extreme events such as marathion running on hard surfaces, then should it ever be shown the spring shoes reduce the effects of osteoarthosis (wear and tear)on the joints,then governing bodies which prevent athletes from taking all reasonable precautions against risk of damage could open themself to greater liabilites.
The IAAF is already embroiled in controversy over the use of a carbon fibre prosthetic used by South African Paralympic gold medallist Oscar Pistorius. They expect to rule out the double amputee's spring legs which single-amputee rivals believe give him an unfair advantage.