PT - JOURNAL ARTICLE AU - George A C Murrell TI - Using nitric oxide to treat tendinopathy AID - 10.1136/bjsm.2006.034447 DP - 2007 Apr 01 TA - British Journal of Sports Medicine PG - 227--231 VI - 41 IP - 4 4099 - http://bjsm.bmj.com/content/41/4/227.short 4100 - http://bjsm.bmj.com/content/41/4/227.full SO - Br J Sports Med2007 Apr 01; 41 AB - Nitric oxide (NO) is a small free radical generated by a family of enzymes, the nitric oxide synthases (NOSs). Following injury to a tendon, NO is induced by all three isoforms of NOS and NOS activity is also upregulated in tendinopathy. In animal models when NOS activity is inhibited by competitive inhibitors of NOS, tendon healing is reduced. When additional NO is added, tendon healing is enhanced. In humans, in three randomised clinical trials, we have shown that NO delivered via a transdermal patch enhances the subjective and objective recovery of patients with tennis elbow, Achilles tendinosis and supraspinatus tendinosis.