Safety and Preliminary Efficacy of iEVs Injection in Treating Lateral Epicondylitis of Humerus

Inclusion Criteria: * Diagnosed with lateral epicondylitis by clinical symptom examination and MRI or ultrasound, without obvious tendon tear; * Unilateral lateral elbow pain lasting for more than 12 weeks; * Pain is provoked by at least 2 of the following methods, with a pain VAS score exceeding 3: maximum grip strength, palpation of the lateral epicondyle of the elbow and surrounding area, resisted dorsiflexion of the wrist or middle finger, or stretching of the forearm extensor muscles under a pain-free grip state; * Having received physical therapy or non-steroidal anti-inflammatory drug treatment with poor efficacy; * Individuals with independent behavioral capacity, who have signed the informed consent form themselves. Exclusion Criteria: * Complaints of ipsilateral muscle pain caused by other reasons in the past 6 months; * Presence of ipsilateral neurogenic, inflammatory, or systemic joint diseases; * A history of previous lateral epicondylitis (LET) surgery in the past 6 months; * Subjects deemed unsuitable for participating in the trial due to other conditions, as judged by the researcher; * MRI showing that the injury has involved the lateral collateral ligament, with concurrent cartilage damage.