title: Platelet-rich plasma versus focused shock waves in the treatment of jumper's knee in athletes.
abstract: BACKGROUND
  Tendinopathies represent a serious challenge for orthopaedic surgeons involved in treatment of athletes.
  
  
  OBJECTIVE
  To compare the effectiveness and safety of platelet-rich plasma (PRP) injections and focused extracorporeal shock wave therapy (ESWT) in athletes with jumper's knee.
  
  
  METHODS
  Randomized controlled trial; Level of evidence, 1.
  
  
  METHODS
  Forty-six consecutive athletes with jumper's knee were selected for this study and randomized into 2 treatment groups: 2 autologous PRP injections over 2 weeks under ultrasound guidance (PRP group; n = 23), and 3 sessions of focused extracorporeal shock wave therapy (2.400 impulses at 0.17-0.25 mJ/mm(2) per session) (ESWT group; n = 23). The outcome measures were Victorian Institute of Sports Assessment-Patella (VISA-P) questionnaire, pain visual analog scale (VAS), and modified Blazina scale. A reviewer who was blinded as to the group allocation of participants performed outcome assessments before treatment and at 2, 6, and 12 months after treatment. Nonparametric tests were used for within-group (Friedman/Wilcoxon test) and between-group (Kruskal-Wallis/Fisher test) testing, and the significance level was set at .05.
  
  
  RESULTS
  The 2 groups were homogeneous in terms of age, sex, level of sports participation, and pretreatment clinical status. Patients in both groups showed statistically significant improvement of symptoms at all follow-up assessments. The VISA-P, VAS, and modified Blazina scale scores showed no significant differences between groups at 2-month follow-up (P = .635, .360, and .339, respectively). The PRP group showed significantly better improvement than the ESWT group in VISA-P, VAS scores at 6- and 12-month follow-up, and modified Blazina scale score at 12-month follow-up (P < .05 for all).
  
  
  CONCLUSIONS
  Therapeutic injections of PRP lead to better midterm clinical results compared with focused ESWT in the treatment of jumper's knee in athletes.
authors: Physical Medicine and Rehabilitation Unit, Sant'Andrea Hospital, Via di Grottarossa 1035-1039, Rome, Italy 00189. mariovetrano@gmail.com
authors: Mario
authors: M
authors: Vetrano
authors: Anna
authors: A
authors: Castorina
authors: Maria Chiara
authors: MC
authors: Vulpiani
authors: Rossella
authors: R
authors: Baldini
authors: Antonio
authors: A
authors: Pavan
authors: Andrea
authors: A
authors: Ferretti
mesh_terms: D000293:Adolescent; D000328:Adult; D001265:Athletic Injuries / Q000628:therapy*; D005260:Female; D006801:Humans; D007718:Knee Injuries / Q000628:therapy*; D008297:Male; D010147:Pain Measurement; D053657:Platelet-Rich Plasma; D011795:Surveys and Questionnaires; D052256:Tendinopathy / Q000628:therapy*; D016896:Treatment Outcome; D014464:Ultrasonic Therapy; D055815:Young Adult