PMID- 26238807
OWN - NLM
STAT- MEDLINE
DCOM- 20170110
LR  - 20220408
IS  - 1873-5800 (Electronic)
IS  - 0968-0160 (Linking)
VI  - 23
IP  - 2
DP  - 2016 Mar
TI  - A new arthroscopic classification of degenerative medial meniscus root tear that 
      correlates with meniscus extrusion on magnetic resonance imaging.
PG  - 246-50
LID - S0968-0160(15)00157-X [pii]
LID - 10.1016/j.knee.2015.07.003 [doi]
AB  - BACKGROUND: To determine a new classification system for medial meniscus root 
      tears (MMRT) based on arthroscopic findings. METHODS: 24 knees (55%) belonged to 
      the nondisplaced or overlapped group, and 20 knees (45%) to the widely displaced 
      group. Absolute meniscal extrusion was defined as distance between outer edge of 
      the articular cartilage of tibial plateau and meniscal outer edge. Relative 
      extrusion was defined as extruded meniscus width divided by entire meniscal 
      width, multiplied by 100. The proportion of knees with major (>3 mm) extrusion 
      were compared in two groups, as were the severity of chondral wear and 
      osteoarthritic change. RESULTS: Absolute (4.6 mm vs. 3.7 mm, P=0.006) and 
      relative (46% vs. 39%, P=0.042) extrusion of the medial meniscus were greater in 
      widely displaced than in nondisplaced or overlapped group. Medial joint space 
      width was significantly narrower in the widely displaced than in the nondisplaced 
      or overlapped group (3.0 mm vs. 4.0 mm, P=0.007). The widely displaced group had 
      a 4 degrees  greater varus deformity, and higher rates of major extrusion (>3 mm), grade 
      III or IV chondral wear in the medial femoral condyle (60% vs. 29%, P=0.039) and 
      medial compartment osteoarthritis (75% vs. 21%, P=0.001) than did the 
      nondisplaced or overlapped group. CONCLUSIONS: Widely displaced MMRT had greater 
      meniscal extrusion and more severe chondral wear and osteoarthritis than did 
      nondisplaced or overlapped MMRT. In this novel classification system, the stage 
      of MMRT severity was associated with tear site displacement. LEVEL OF EVIDENCE: 
      Case series (level IV).
CI  - Copyright (c) 2015 Elsevier B.V. All rights reserved.
FAU - Bin, Seong-Il
AU  - Bin SI
AD  - Department of Orthopedic Surgery, University of Ulsan, College of Medicine, Asan 
      Medical Center, Seoul, Republic of Korea.
FAU - Jeong, Tae-Wan
AU  - Jeong TW
AD  - Department of Orthopaedic Surgery, Korea University, College of medicine, Anam 
      Hospital, Seoul, Republic of Korea.
FAU - Kim, Su-Jin
AU  - Kim SJ
AD  - Department of Emergency Medicine, Korea University, College of medicine, Anam 
      Hospital, Seoul, Republic of Korea.
FAU - Lee, Dae-Hee
AU  - Lee DH
AD  - Department of Orthopaedic Surgery, Samsung Medical Center, Sungkyunkwan 
      University School of Medicine, Seoul, Republic of Korea. Electronic address: 
      eoak22@empal.com.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20150801
PL  - Netherlands
TA  - Knee
JT  - The Knee
JID - 9430798
SB  - IM
MH  - Adult
MH  - Aged
MH  - Arthroscopy/*methods
MH  - Female
MH  - Follow-Up Studies
MH  - Humans
MH  - Magnetic Resonance Imaging/*methods
MH  - Male
MH  - Menisci, Tibial/*diagnostic imaging
MH  - Middle Aged
MH  - Reproducibility of Results
MH  - Retrospective Studies
MH  - Rupture/classification/diagnosis
MH  - Tibial Meniscus Injuries/*classification/diagnosis
MH  - Time Factors
OTO - NOTNLM
OT  - Arthroscopy
OT  - Displacement
OT  - Extrusion
OT  - Medial meniscus
OT  - Root tear
EDAT- 2015/08/05 06:00
MHDA- 2017/01/11 06:00
CRDT- 2015/08/05 06:00
PHST- 2014/11/27 00:00 [received]
PHST- 2015/05/12 00:00 [revised]
PHST- 2015/07/01 00:00 [accepted]
PHST- 2015/08/05 06:00 [entrez]
PHST- 2015/08/05 06:00 [pubmed]
PHST- 2017/01/11 06:00 [medline]
AID - S0968-0160(15)00157-X [pii]
AID - 10.1016/j.knee.2015.07.003 [doi]
PST - ppublish
SO  - Knee. 2016 Mar;23(2):246-50. doi: 10.1016/j.knee.2015.07.003. Epub 2015 Aug 1.