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Low-Intensity Pulsed Ultrasound Enhances Early Healing of Medial Collateral Ligament Injuries in Rats

Department of Orthopaedic Surgery, Kobe University School of Medicine, Kobe, Japan

Nobuzo Matsui, MD, Department of Orthopaedic Surgery, Kobe University School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan.

Objective. To investigate the effect of low-intensity pulsed ultrasound exposure on the healing of injured medial collateral ligaments. Methods. Thirteen male Sprague Dawley rats were used in the study. After surgical transection of the bilateral medial collateral ligaments, the ligament of 1 knee received low-intensity pulsed ultrasound exposure (30 mW/cm² for 20 minutes daily), whereas no ultrasound was applied to the contralateral knee (control side). Eight rats were killed at 12 days after surgery, and 5 rats were killed at 21 days. The bilateral knees of 5 rats were used for mechanical testing at each of the 2 periods, and 12-day specimens of the remaining 3 rats were prepared for the electron microscopic examination. The knees of 5 additional rats were used to obtain mechanical data of the normal uninjured medial collateral ligament. Results. On the 12th day, the low-intensity pulsed ultrasound–treated side exhibited significantly superior mechanical properties when compared with the control side in ultimate load, stiffness, and energy absorption (P < .05). However, the treatment did not afford any mechanical advantage when tested on the 21st day. The mean diameter of the fibril was significantly larger on the treatment side than on the control side (P < .05). Conclusions. Lowintensity pulsed ultrasound exposure is effective for enhancing the early healing of medial collateral ligament injuries.

Key Words: low-intensity pulsed ultrasound • medial collateral ligament • early healing

Abbreviations: LIPUS • low-intensity pulsed ultrasound

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