A new distraction arthroplasty device using magnetic force; a cadaveric study

作者：Kamei Goki^*; Ochi Mitsuo; Okuhara Atsushi; Fujimiya Mineko; Deie Masataka; Adachi Nobuo; Nakamae Atsuo; Nakasa Tomoyuki; Ohkawa Shingo; Takazawa Kobun; Eguchi Akio; Katou Tomohiro; Takada Tsuyoshi; Usman Muhammad Andry

来源：Clinical Biomechanics, 2013, 28(4): 423-428.

DOI：10.1016/j.clinbiomech.2013.02.003

• Distraction arthroplasty
• Osteoarthritis
• Cadaver study

Background: It is difficult for an articular cartilage injury to repair spontaneously. There are many procedures for treating cartilage injury, however there is no standard procedure for middle-aged patients who have diffuse knee osteoarthritis, especially of the lateral compartment. Therefore, Ochi developed a new distraction device that uses magnetic power to enlarge a joint space and promote cartilage regeneration with microfracture. The purpose of this study is to evaluate this new distraction arthroplasty system by using the cadaveric knee. %26lt;br%26gt;Methods: This study used ten knees from six cadavers that were embalmed by Thiel%26apos;s methods. The medial and lateral joint space was measured by AP radiographic view before and after distraction, and after weight-bearing to evaluate the joint distraction. The contact pressure of the medial and lateral compartments at the knee extension position by using a prescale film system was measured before and after weight-bearing with a 15 or 30-kg weight-bearing load to evaluate the effectiveness of this device. %26lt;br%26gt;Findings: The lateral joint space significantly increased from the pre-distraction to the post-distraction; however, it did not change significantly between post-distraction and post-weight-bearing. %26lt;br%26gt;With a 15 or 30-kg weight-bearing load, the contact pressure of the lateral compartment significantly decreased from the pre-distraction to the post-distraction. %26lt;br%26gt;Interpretation: The most important advantage of this device is that it maintains a continuous distraction tension and enables almost the full range of motion of the knee. We believe that joint distraction by using magnetic force can be a promising option for cartilage injury in middle-aged patients.

• 出版日期2013-4