28 juillet 2010 3 28 /07 /juillet /2010 08:32






High-resolution MRI using a microscopy coil for the diagnosis of recurrent lateral patellar dislocation

Yuki IwamaContact Information, Masahiko Fujii1, Hitoshi Shibanuma2, Hirotsugu Muratsu3, Masahiro Kurosaka3, Hideaki Kawamitsu1 and Kazuro Sugimura1

(1)  Department of Radiology, Kobe Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan
(2)  Department of Orthopedic Surgery, Kobe Kaisei Hospital, Kobe, Japan
(3)  Department of Orthopedic Surgery, Kobe Graduate School of Medicine, Kobe, Japan

Received: 21 November 2005  Accepted: 11 January 2006  

Purpose  Magnetic resonance imaging (MRI) has been commonly used for the preoperative evaluation of recurrent lateral patellar dislocation (RLPD).
 The purpose of this study was to determine the usefulness of high-resolution MRI (HR-MRI) with a microscopy coil for diagnosing RLPD.
Materials and methods  The study group consisted of 15 patients with clinically diagnosed RLPD and 10 normal volunteers. All studies were performed on a 1.5-T MR system. First, conventional MRIs of the whole knee joint were obtained using the knee coil. Then HR-MRI scans using a microscopy coil in the medial aspect of the patella were obtained at the level of the superior pole of the patella, targeting the medial patellofemoral ligament (MPFL). The acquired HR-MRIs with RLPD were reviewed concerning the MPFL injury and the patellar injury.
Results  The MPFL was distinguished as a separate ligament, and the layer structure of the patellar cartilage was visualized clearly in all volunteers. The MPFL injury was visualized in 12 cases (87%); it included discontinuity, thickening, and loosening.
The patellar injury was visualized in 11 cases (73%), which included dissecans of the medial margin and cartilage injuries.
 HR-MRI with a microscopy coil provides precise information of the MPFL and patellar cartilage injury for the diagnosis of RLPD.

Key words  High-resolution MRI - Microscopy coil - Recurrent lateral patellar dislocation - Medial patellofemoral ligament




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