Knee Surg Relat Res.  2019 Dec;31(4):e9. 10.1186/s43019-019-0011-5.

Preliminary diagnosis of medial meniscus posterior root tears using the Rosenberg radiographic view

Affiliations
  • 1Department of Orthopaedic Surgery, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan. matino@md.okayama-u.ac.jp
  • 2Department of Orthopaedic Surgery, Iwakuni Clinical Center, 1-1-1 Atagomachi, Iwakuni, Yamaguchi 740-8510, Japan.

Abstract

PURPOSE
To verify the effectiveness of detecting medial meniscus posterior root tears (MMPRTs) using weight-bearing posterior-anterior (PA) radiographs.
MATERIALS AND METHODS
Twenty-three patients were diagnosed with an MMPRT using magnetic resonance imaging (Group A), with 23 matched individuals forming the control group (Group B). The distance between medial tibial eminence and the lateral edge of the medial femoral condyle (MTE-MFC distance) and medial joint space (MJS) width were measured on weight-bearing PA radiographs, with the knee flexed at 45° (Rosenberg view). Absolute medial meniscus extrusion (MME) was measured on magnetic resonance images.
RESULTS
The MTE-MFC distance was greater and the MJS width was smaller in Group A than Group B (7.7 ± 1.7mm versus 6.0 ± 1.24mm and 3.2 ± 0.8mm versus 4.5 ± 0.7 mm, respectively; P < 0.05). The MTE-MFC distance and MJS width correlated with MME (r = 0.603 and 0.579, respectively; P < 0.05), and the extent of MME was greater in Group A than Group B (4.1 ± 1.1mm versus 1.8 ± 1.5 mm, respectively; P < 0.05).
CONCLUSIONS
MMPRTs increase the MTE-MFC distance and decrease the MJS width, with these measurements correlating to the MME. Therefore, measurement of the MTE-MFC distance and MJS width on the Rosenberg view could be a useful preliminary method for the diagnosis of an MMPRT. LEVEL OF EVIDENCE: IV

Keyword

Medial meniscus; Posterior root tear; Meniscal extrusion; Joint space; Rosenberg view; Weight-bearing radiograph

MeSH Terms

Diagnosis*
Humans
Joints
Knee
Magnetic Resonance Imaging
Menisci, Tibial*
Methods
Tears*
Weight-Bearing
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