Joost Peerbooms

71 PRP in lateral epicondylitis Table 1 Patient Demographics Corticosteroid Platelet-Rich Plasma P Number 51 49 Age, y 47.3 ± 7.6 46.9 ± 8.4 .797 a Sex: male, female 25, 26 23, 26 .840 b Side: right, left 32, 19 31, 18 .957 b Lost to follow-up 1 3 .700 b Reinterventions 13 5 .970 b α t test. b Chi-square test. The mean patient age was 47 years. There were 48 men and 52 women. The study included 63 patients with lateral epicondylitis on the right elbow and 37 patients with symptoms on the left elbow. The ratio between dominant and nondominant side was according to the literature: 65%. In most cases, the dominant side was involved. 23 The ratio was equally distributed. The activity level of the patients, preintervention and postintervention, has been noted in the DASH score. Eighteen patients needed a reintervention. The patients who needed a reintervention were all scored as nonsuccessful. Between the 2 hospitals, there were no significant differences between the protocol-compliant patients and the reintervention patients ( P = .168). The primary analysis was conducted on a carried-forward principle and involved 100 patients. In total, 18 reinterventions or operations were needed after an average of 5 months (range, 2-6 months). In the PRP group, 3 patients obtained an operation and 2 patients a reinjection with corticosteroids. In the corticosteroid group, 6 patients required an operation, 1 a reinjection with corticosteroid, and 6 a reinjection with PRP after 6 months of follow-up (Table 2). The percentages of reintervention did not depend on age, gender, side, treatment, or preoperative VAS or DASH score. 5