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Determination of Normal Reference Values for Meniscal Extrusion Using Ultrasonography During the Different Range of Motion: A Pilot, Feasibility Study Publisher Pubmed



Sharafat Vaziri A1, 2 ; Aghaghazvini L3 ; Jahangiri S4 ; Tahami M5 ; Borazjani R6 ; Tahmasebi MN7 ; Rabie H2 ; Mamaghani HJ8 ; Vosoughi F1, 2 ; Salimi M4, 5
Authors
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Authors Affiliations
  1. 1. Fellowship of Knee, Sport and Reconstruction Surgery, Center of Orthopedic Trans-Disciplinary Applied Research (COTAR), Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Department of Orthopaedics and Trauma Surgery, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Department of Radiology, Shariati Hospital, Tehran University of Medical Science, Tehran, Iran
  4. 4. Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran
  5. 5. Bone and Joint Diseases Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
  6. 6. Trauma Research Center, Shahid Rajaee (Emtiaz) Trauma Hospital, Shiraz University of Medical Sciences, Shiraz, Iran
  7. 7. Knee, Sport and Reconstruction Surgery, Knee Surgery Fellowship Program, Orthopaedic Surgery Department, Shariati Hospital and School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
  8. 8. Students' Scientific Research Center (SSRC), Tehran University of Medical Science, Tehran, Iran

Source: Journal of Ultrasound in Medicine Published:2022


Abstract

Objectives: It is essential to know the normal extrusion measures in order to detect pathological ones. In this study, we aimed to define some normal reference values for meniscal extrusion in the normal knees during different ranges of motion. Methods: The amount of anterior and posterior portion of meniscal extrusion among 21 asymptomatic volunteers (42 knees) were tracked in 0, 45, and 90° of knee flexion using an ultrasound machine. The repeated measures analysis of variance (ANOVA) was used to show the interaction between the amounts of meniscal extrusion and the different degrees of knee flexion. Results: The anterior portion of the lateral menisci at full knee extension (0.59 ± 1.40) and the posterior portion of the medial menisci during 90° flexion (3.06 ± 2.36) showed the smallest and the highest mean amount of extrusion, respectively. The normal average amounts of anterior extrusion were 1.12 ± 1.17 and 0.99 ± 1.34 mm for medial and lateral menisci, respectively. The posterior meniscal normal extrusions were significantly increasing in both medial and lateral menisci during the survey (F = 20.250 and 11.298; both P values <.001) as they were measured 2.37 ± 2.16 and 1.53 ± 2.18 mm in order. Conclusions: The medial meniscus can extrude 1.74 ± 1.84 mm normally while this amount was 1.26 ± 1.82 mm for the lateral meniscus. These measures commonly increased with the rising of knee flexion motion. Likewise, the posterior portion showed more extrusion than the anterior portion on both sides. These measures commonly increased with higher knee flexion. © 2022 American Institute of Ultrasound in Medicine.