The MRI Classification and Lesion Characteristics of Medial Discoid Meniscus_West China Medical Journal

Authors：

 LiDongming ¹ ,  DengKaihong ²

1. Department of Radiology, Orthopedic Hospital of Sichuan Province, Chengdu, Sichuan 610041, P. R. China;
2. Department of Radiology, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P. R. China;

Corresponding?author：

DengKaihong, Email: dengmx@126.com

Keywords：

Knee joint; Medial discoid meniscus; MRI classification; Lesion

DOI：

10.7507/1002-0179.201600550

Video：

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Objective To discuss the MRI diagnostic criteria, classification and lesion characteristics of medial discoid meniscus of the knee. Methods We retrospectively analyzed the clinical data of all patients who accepted MRI examination of knee from November 2009 to March 2015.Twenty-six of them (28 knees) with medial discoid meniscus were screened out.We measured and analyzed in all cases the ratio of the width of meniscus to that of tibial plateau on coronal slice, and the thickest thickness of the meniscus posterior horn on sagittal slice.All cases were divided into complete and incomplete type according to MRI findings, and then we compared the lesion rate of the two types of medial discoid meniscus. Results Twenty-eight cases were divided into complete type (n=16) and incomplete type (n=12);there were 17 cases of medial discoid meniscal tears, with a lesion rate of 60.7%.The ratio of the width of meniscus to that of tibial plateau on coronal slice was 0.29±0.06, and the thickest thickness of the meniscus posterior horn was (5.31±0.92) mm.The lesion rate of complete type was 81.2%, and 33.3% of the incomplete type.The lesion rate of the complete type was higher than that of the incomplete type, and the difference was statistically significant (P < 0.05). Conclusions Three MRI diagnostic criteria for medial discoid meniscus are 3 or more than 3 consecutive layers discoid meniscus "tie-like" change in sagittal slice, the ratio of the width of meniscus to that of tibial plateau≥0.20, and the thickest thickness of the meniscus posterior horn≥4.40 mm.Medial discoid meniscuses are divided into complete and incomplete type; the lesion rate of complete type of medial discoid meniscus is higher than that of the incomplete type.

Citation： LiDongming, DengKaihong. The MRI Classification and Lesion Characteristics of Medial Discoid Meniscus. West China Medical Journal, 2016, 31(12): 2008-2012. doi: 10.7507/1002-0179.201600550 Copy

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2.	Rohren EM, Kosarek FJ, Helms CA. Discoid lateral meniscus and the frequency of meniscal tears[J]. Skeletal Radiol, 2001, 30(6):316-320.
3.	李東明, 張德洲, 易雪冰, 等.膝關節盤狀半月板分型及撕裂相關性的MRI分析[J].中國中西醫結合影像學雜志, 2013, 11(6):614-617.
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6.	Kaplan EB. Discoid lateral meniscus of the knee joint[J]. J Bone Surg Am, 1957, 39(1):77-87.
7.	Yaniv M, Blumberg N. The discoid meniscus[J]. J Child Orthop, 2007, 1(2):89-96.
8.	Jones R. Specimen of internal semilunar cartilage as a complete disc[J]. Proc R Soc Med, 1930, 23(11):1588-1589.
9.	Smillie IS. Injuries of the knee joint[M]. Edinburgh, London, New York:Churchill Livingstone, 1978:98-103.
10.	Dickason J, Del Pizzo W, Blazina M, et al. A series of ten discoid medial menisci[J]. Clin Orthop Relat Res, 1982, 168(168):75-79.
11.	Elvey M, Konan S, House C, et al. Horizontal cleavage tear of discoid medial meniscus diagnosed on MRI and treated with arthroscopic partial resection[J]. Knee Surg Sports Traumatol Arthrosc, 2011, 19(11):1860-1867.
12.	白正武, 閆新峰, 張明, 等.膝內側盤狀半月板1例報告[J].中國矯形外科雜志, 2005, 13(9):676.
13.	趙志宏, 陳連旭, 苗羽, 等.膝關節內側盤狀軟骨損傷13例病歷分析[J].中國運動醫學雜志, 2012, 31(9):777-780.
14.	Mc Dermott ID, Amis AA. The Consequences of meniscectomy[J]. J Bone Joint Surg, 2006, 88(12):1549-1556.
15.	李東明, 鄧開鴻, 張旸, 等.雙膝關節盤狀半月板MRI分型及損傷特點[J].華西醫學, 2013, 28(12):1854-1857.
16.	陳東陽, 蔣青, 徐志宏, 等.膝關節內側盤狀半月板的診斷與治療2例報道[J].中國運動醫學雜志, 2010, 29(6):706-707.
17.	Ahn J, Choi S, Lee Yong, et al. Symptomatic torn discoid lateral meniscus in adults[J]. Knee Surg Sports Traumatol Arthrosc, 2011, 19(2):158-164.
18.	夏春, 周江南, 陳國能, 等.關節鏡下盤狀半月板的治療[J].中國微創外科雜志, 2002, 2(6):381-382.

1. Berquuist TH.肌肉骨骼系統磁共振成像[M]. 4版.程敬亮, 祁吉, 史大鵬, 譯.鄭州:鄭州大學出版社, 2001:361.
2. Rohren EM, Kosarek FJ, Helms CA. Discoid lateral meniscus and the frequency of meniscal tears[J]. Skeletal Radiol, 2001, 30(6):316-320.
3. 李東明, 張德洲, 易雪冰, 等.膝關節盤狀半月板分型及撕裂相關性的MRI分析[J].中國中西醫結合影像學雜志, 2013, 11(6):614-617.
4. Watanabe M. Arthroscopy of the knee joint[M]. Philadelphia:Lippincott, 1974:145-159.
5. Smillie I. The congenital discoid meniscus[J]. J Bone Joint Surg, 1948, 30B (4):671-682.
6. Kaplan EB. Discoid lateral meniscus of the knee joint[J]. J Bone Surg Am, 1957, 39(1):77-87.
7. Yaniv M, Blumberg N. The discoid meniscus[J]. J Child Orthop, 2007, 1(2):89-96.
8. Jones R. Specimen of internal semilunar cartilage as a complete disc[J]. Proc R Soc Med, 1930, 23(11):1588-1589.
9. Smillie IS. Injuries of the knee joint[M]. Edinburgh, London, New York:Churchill Livingstone, 1978:98-103.
10. Dickason J, Del Pizzo W, Blazina M, et al. A series of ten discoid medial menisci[J]. Clin Orthop Relat Res, 1982, 168(168):75-79.
11. Elvey M, Konan S, House C, et al. Horizontal cleavage tear of discoid medial meniscus diagnosed on MRI and treated with arthroscopic partial resection[J]. Knee Surg Sports Traumatol Arthrosc, 2011, 19(11):1860-1867.
12. 白正武, 閆新峰, 張明, 等.膝內側盤狀半月板1例報告[J].中國矯形外科雜志, 2005, 13(9):676.
13. 趙志宏, 陳連旭, 苗羽, 等.膝關節內側盤狀軟骨損傷13例病歷分析[J].中國運動醫學雜志, 2012, 31(9):777-780.
14. Mc Dermott ID, Amis AA. The Consequences of meniscectomy[J]. J Bone Joint Surg, 2006, 88(12):1549-1556.
15. 李東明, 鄧開鴻, 張旸, 等.雙膝關節盤狀半月板MRI分型及損傷特點[J].華西醫學, 2013, 28(12):1854-1857.
16. 陳東陽, 蔣青, 徐志宏, 等.膝關節內側盤狀半月板的診斷與治療2例報道[J].中國運動醫學雜志, 2010, 29(6):706-707.
17. Ahn J, Choi S, Lee Yong, et al. Symptomatic torn discoid lateral meniscus in adults[J]. Knee Surg Sports Traumatol Arthrosc, 2011, 19(2):158-164.
18. 夏春, 周江南, 陳國能, 等.關節鏡下盤狀半月板的治療[J].中國微創外科雜志, 2002, 2(6):381-382.

West China Medical Journal

The MRI Classification and Lesion Characteristics of Medial Discoid Meniscus

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