title: Extracorporeal shock-wave therapy for chronic lateral tennis elbow--prediction of outcome by imaging.
abstract: Today the clinical use of extracorporeal shockwave application (ESWA) for the treatment of lateral tennis elbow is hampered by the lack of results from randomized controlled trials and of predictive parameters of clinical outcome. The present prospective study aimed to provide the latter by means of magnetic resonance imaging (MRI). Twenty-three female and 19 male patients with unilateral chronic tennis elbow of the dominant site were clinically examined before and after repetitive low-energy ESWA. MRI was performed before ESWA to evaluate signal intensity changes or contrast enhancement of the common extensor tendon and the lateral epicondyle. After ESWA (mean follow-up period 18.6 months for all patients), clinical evaluation showed a significantly better mean clinical performance after ESWA than before treatment. Interestingly, male patients showed a significantly better mean clinical performance after ESWA than female patients, and male and female patients differed significantly in the signal intensity of the common extension tendon cross-section and tendon thickening on MRI. For female patients, MRI scans could be applied for predicting a positive clinical outcome of ESWA. This study reports the first indication of predictability of positive clinical outcome of the treatment of chronic lateral tennis elbow by ESWA using imaging prior to treatment. This may serve as an important step towards overcoming the therapeutic nihilism with respect to the non-operative management of this condition recently in the literature.
authors.affiliation: Department of Orthopaedic Surgery, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany. markus.maier@ort.med.uni-muenchen.de
authors.forename: M
authors.initials: M
authors.lastname: Maier
authors.forename: M
authors.initials: M
authors.lastname: Steinborn
authors.forename: C
authors.initials: C
authors.lastname: Schmitz
authors.forename: A
authors.initials: A
authors.lastname: Stäbler
authors.forename: S
authors.initials: S
authors.lastname: Köhler
authors.forename: A
authors.initials: A
authors.lastname: Veihelmann
authors.forename: M
authors.initials: M
authors.lastname: Pfahler
authors.forename: H J
authors.initials: HJ
authors.lastname: Refior
mesh_terms: D000328:Adult; D000368:Aged; D002908:Chronic Disease; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008096:Lithotripsy; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D013716:Tennis Elbow / Q000473:pathology* / Q000628:therapy*; D016896:Treatment Outcome