Abstract
PurposeTo verify the effectiveness of detecting medial meniscus posterior root tears (MMPRTs) using weight-bearing posterior-anterior (PA) radiographs.Materials and methodsTwenty-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.ResultsThe MTE–MFC distance was greater and the MJS width was smaller in Group A than Group B (7.7 ± 1.7 mm versus 6.0 ± 1.24 mm and 3.2 ± 0.8 mm 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 ± 1.1 mm versus 1.8 ± 1.5 mm, respectively; P < 0.05).ConclusionsMMPRTs 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 evidenceIV
Highlights
Medial meniscus posterior root tears (MMPRTs) disrupt the continuity of the circumferential fibers, leading to loss of hoop tension, loss of load-sharing ability, abnormal rotation of the tibia, and unacceptable peak pressures [1,2,3,4]
MMPRTs increase the MTE–medial femoral condyle (MFC) distance and decrease the medial joint space (MJS) width, with these measurements correlating to the medial meniscus extrusion (MME)
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
Summary
Medial meniscus posterior root tears (MMPRTs) disrupt the continuity of the circumferential fibers, leading to loss of hoop tension, loss of load-sharing ability, abnormal rotation of the tibia, and unacceptable peak pressures [1,2,3,4]. These pathological characteristics lead to degenerative arthritic changes in the knee joint [1, 3]. Radiographs obtained while weight bearing with knee flexion may provide a more reliable assessment of an MMPRT than those taken in an extended position. If tibiofemoral subluxation can be evaluated using radiographic examination, positive findings on weight-bearing radiography could provide a persuasive and expedient preliminary method for early detection of an MMPRT
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