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Combined Therapy of Extracorporeal Shock Waves and Etidronate Disodium as a Potential Treatment for Post-traumatic Myositis Ossificans in the Quadriceps Muscle: A Case Report 原, 則行 ハラ, ノリユキ 鈴木, 孝治 スズキ, コウジ 三上, 将 ミカミ, ススム 内田, 淳 ウチダ, ジュン 清藤, 直樹 セイトウ, ナオキ 高橋, 龍尚 タカハシ, タツヒサ Computed tomography EHDP ESWT Indomethacin Heterotopic ossification Objective: To investigate the therapeutic effect of the combination of extracorporeal shock waves (ESWs) and Etidronate sodium (EHDP) on post-traumatic Myositis Ossificans (MO) in the quadriceps muscle. \nCase description: A 26-year-old male ice hockey player complained of left thigh pain and stiffness, 4 weeks after a direct blow to the thigh from the knee of an opponent in a game. A firm mass with tenderness was palpated at the antero-mid area of the Rectus Femoris. Movement of his left knee was restricted to 50 degrees of flexion from full extension. A radiograph showed a lacy pattern of new bone formation in the anterior aspect of the left femur at 4 weeks after the injury. The injury was thus diagnosed as post-traumatic MO in the left quadriceps muscle. Indomethacin was administered for the first 7 days of hospitalization. EHDP was given orally for 3 months. ESW therapy was performed for the treatment of MO without any anesthesia: 3500 pulses at an energy density of 0.03 to 0.36 mJ/mm2 per week, in seven sessions. Pain in the muscle improved with 2 weeks of complete rest with immobilization, and thereafter by moving the knee actively and passively within pain-free limits. A normal range of pain-free motion of the affected knee was achieved in 8 weeks. The athlete then started various rehabilitation exercises, such as stretching and walking. He returned to full sporting activity 5 months after the initial treatment. \nConclusion: Combined therapy of ESW and EHDP was useful for the treatment of post-traumatic MO in the quadriceps muscle. Creative Commons License CC BY-NC-ND 4.0 text application/pdf 2020-02-01 eng journal article VoR https://asahikawa-med.repo.nii.ac.jp/records/6180 10.37421/jppr.2020.05.180 2573-0312 Journal of Physiotherapy and Physical Rehabilitation 5 1 1 5 https://asahikawa-med.repo.nii.ac.jp/record/6180/files/7388.pdf application/pdf 449.7 kB 2021-07-06