Elbow tendinopathy is a common pathology of the upper extremity that impacts both athletes and workers. Some research has examined the genetic component as a risk factor for tendinopathy, mainly in the lower limbs. A case-control study was designed to test for a relationship between certain collagen gene single nucleotide polymorphisms (SNPs) and elbow tendon pathology. A sample of 137 young adult athletes whose sports participation involves loading of the upper limb were examined for the presence of structural abnormalities indicative of pathology in the tendons of the lateral and medial elbow using ultrasound imaging and genotyped for the following SNPs: COL5A1 rs12722, COL11A1 rs3753841, COL11A1 rs1676486, and COL11A2 rs1799907. Anthropometric measurements and data on participants' elbow pain and dysfunction were collected using the Disabilities of the Arm, Shoulder and Hand and the Mayo Clinic Performance Index for the Elbow questionnaires. Results showed that participants in the structural abnormality group had significantly higher scores in pain and dysfunction. A significant relationship between COL11A1 rs3753841 genotype and elbow tendon pathology was found (p = 0.024), with the CT variant associated with increased risk of pathology.Tendinopathy is a common condition that affects a large portion of the population, making up 30% of all musculoskeletal injuries 1 and being the most prevalent tendon disorder 2 . It is generally defined as an overuse injury resulting in tendon degeneration after a failed early inflammatory healing response 3 , leading to collagen disorientation and disorganization in the absence of classic inflammatory changes, accompanied by pain and dysfunction 4,5 . Tendon homeostasis relies on a dynamic remodeling process influenced by tendon loading and cytokines, among other things. Evidence support the expression and functional involment of pro-inflammatory cytokines such as interleukin-1ß in tissues surrounding mechanically injured tendon 6 . Tendon inflammation and tendinopathy are possible manifestations of a disturbance of this homeostasis. The role of inflammation in tendon healing or failure to heal is complex and not fully understood, but it is known that an initial inflammatory response is required to begin the healing process. On the other hand, cytokines appear to be capable of inducing a failed healing response in several diseases of connective tissue (cartilage, bone, synovial joint) possibly by altering the expression of matrix metalloproteinases 7 . Probably the tendon is no exception, although there are no conclusive data at present on the role of these cytokines in the tendinopathy development 6,7 .The exact incidence of elbow tendinopathy is unknown, but it is estimated to affect 1-3% of adults each year in the lateral elbow 8 and 0.1-0.75% in the medial elbow 9 . It has been reported that the pathogenesis of the medial pathology parallels that of the lateral pathology, with similar patterns of angiofibroblastic degeneration 10 . In athletes, individuals who practice s...