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Comparison of the effectiveness of extensor muscle strengthening exercise by itself, exercise with polydeoxyribonucleotide injection, and exercise with extracorporeal shockwave therapy in lateral epicondylitis: a randomized controlled trial

  • Shim, Bum Jin (Department of Orthopedic Surgery, Chuncheon Sacred Heart Hospital, Hallym University Medical College) ;
  • Seo, Eun-Min (Department of Orthopedic Surgery, Chuncheon Sacred Heart Hospital, Hallym University Medical College) ;
  • Hwang, Jung-Taek (Department of Orthopedic Surgery, Chuncheon Sacred Heart Hospital, Hallym University Medical College) ;
  • Kim, Do-Young (Department of Orthopedic Surgery, Chuncheon Sacred Heart Hospital, Hallym University Medical College) ;
  • Yang, Jae-Shin (Department of Orthopedic Surgery, Chuncheon Sacred Heart Hospital, Hallym University Medical College) ;
  • Seo, Su-Jung (Department of Orthopedic Surgery, Chuncheon Sacred Heart Hospital, Hallym University Medical College) ;
  • Hong, Myung Sun (Department of Radiology, Chuncheon Sacred Heart Hospital, Hallym University Medical College)
  • Received : 2021.05.10
  • Accepted : 2021.07.26
  • Published : 2021.12.01

Abstract

Background: Extensor muscle strengthening exercises with counterforce braces (EX) is a conventional conservative treatment for lateral epicondylitis (LE) of the elbow. In addition, polydeoxyribonucleotide (PDRN) or extracorporeal shockwave therapy (ESWT) has been recently used for LE. Methods: Sixty-three patients with chronic LE participated in this study and randomly allocated in three groups (G1: EX, G2: EX+PDRN injection, and G3: EX+ESWT). All of the three groups were taught to perform EX at the first out-patient department (OPD) visit. Group 2 was injected with 3 mL PDRN (5.625 mg/3 mL), while group 3 received ESWT at the first OPD visit. Visual analog scale pain score, Mayo elbow performance score (MEPS), and ultrasonographic examination were checked before, 6 weeks, and 12 weeks after the treatments. Results: Overall functional scores and ultrasonographic findings in all three groups improved after treatment. The mean MEPS in group 2 improved more than groups 1 and 3 at 6 weeks (G1, 56.9>62.4; G2, 54.3>65.0; G3, 55.7>62.6), and more than group 1 at 12 weeks (G1, 56.9>67.9; G2, 54.3>73.6). The mean common extensor tendon depth (CETD) on ultrasonography in group 2 increased more than groups 1 and 3 at 6 and 12 weeks (6 weeks: G1, 0.385>0.386; G2, 0.332>0.392; G3, 0.334>0.357; 12 weeks: G1, 0.385>0.409; G2, 0.332>0.438; G3, 0.334>0.405 [cm]). Conclusions: PDRN injections combined with EX exhibited a greater improvement in mean MEPS and mean CETD compared to EX only or EX combined with ESWT for LE within the 12 weeks follow-up.

Keywords

Acknowledgement

The authors wish to thank the orthopedic nurses, Yun-Il Choe, Byeong-Yi Choi, and Ye-Rin Yoon for checking the visual analog scale score and Mayo elbow performance score and helping with the ultrasonographic examinations.

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