PMID- 26535342
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20151104
LR  - 20200930
IS  - 2325-9671 (Print)
IS  - 2325-9671 (Electronic)
IS  - 2325-9671 (Linking)
VI  - 2
IP  - 7
DP  - 2014 Jul
TI  - Effect of Posterior Horn Medial Meniscus Root Tear on In Vivo Knee Kinematics.
PG  - 2325967114541220
LID - 10.1177/2325967114541220 [doi]
LID - 2325967114541220
AB  - BACKGROUND: Medial meniscus root tear (MMRT) is a recently recognized yet 
      frequently missed meniscal tear pattern that biomechanically creates an 
      environment approaching meniscal deficiency. HYPOTHESIS/PURPOSE: The purpose of 
      this study was to assess the effect of MMRT on tibiofemoral kinematics and 
      arthrokinematics during daily activities by comparing the injured knees of 
      subjects with isolated MMRT to their uninjured contralateral knees. The 
      hypothesis was that the injured knee will demonstrate significantly more lateral 
      tibial translation and adduction than the uninjured knee, and that the medial 
      compartment will exhibit significantly different arthrokinematics than the 
      lateral compartment in the affected limb. STUDY DESIGN: Cross-sectional study; 
      Level of evidence, 3. METHODS: Seven subjects with isolated MMRT were recruited 
      and volumetric, density-based 3-dimensional models of their distal femurs and 
      proximal tibia were created from computed tomography scans. High-speed, biplane 
      radiographs were obtained of both their affected and unaffected knees. Moving 
      3-dimensional models of tibiofemoral kinematics were calculated using model-based 
      tracking to assess overall kinematic variables and specific measures of 
      tibiofemoral joint contact. The affected knees of the subjects were then compared 
      to their unaffected contralateral knees. RESULTS: Affected knees demonstrated 
      significantly more lateral tibial translation than the uninjured contralateral 
      limb in all dynamic activities. Additionally, the medial compartment displayed 
      greater amounts of mobility than the lateral compartment in the injured limbs. 
      CONCLUSION: This study suggests that MMRT causes significant changes in in vivo 
      knee kinematics and arthrokinematics and that the magnitude of these changes is 
      influenced by dynamic task difficulty. CLINICAL RELEVANCE: Medial meniscus root 
      tears lead to significant changes in joint arthrokinematics, with increased 
      lateral tibial translation and greater medial compartment excursion. With 
      complete root tears, essentially 100% of circumferential fibers are lost. This 
      study will further our knowledge of meniscal deficiency and osteoarthritis and 
      provide a baseline for more common forms of medial meniscal injuries (vertical, 
      horizontal, radial), with various degrees of circumferential fiber function 
      remaining.
FAU - Marsh, Chelsea A
AU  - Marsh CA
AD  - Biodynamics Laboratory, University of Pittsburgh, Pittsburgh, Pennsylvania, USA. 
      ; Department of Bioengineering, University of Pittsburgh, Pittsburgh, 
      Pennsylvania, USA.
FAU - Martin, Daniel E
AU  - Martin DE
AD  - Biodynamics Laboratory, University of Pittsburgh, Pittsburgh, Pennsylvania, USA. 
      ; Kaiser Permanente, Napa-Solano, Vacaville, California, USA.
FAU - Harner, Christopher D
AU  - Harner CD
AD  - Biodynamics Laboratory, University of Pittsburgh, Pittsburgh, Pennsylvania, USA. 
      ; Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, 
      Pittsburgh, Pennsylvania, USA.
FAU - Tashman, Scott
AU  - Tashman S
AD  - Biodynamics Laboratory, University of Pittsburgh, Pittsburgh, Pennsylvania, USA. 
      ; Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, 
      Pittsburgh, Pennsylvania, USA.
LA  - eng
PT  - Journal Article
DEP - 20140711
PL  - United States
TA  - Orthop J Sports Med
JT  - Orthopaedic journal of sports medicine
JID - 101620522
PMC - PMC4588528
OTO - NOTNLM
OT  - knee arthrokinematics
OT  - knee kinematics
OT  - medial meniscus
OT  - medial meniscus root tear
COIS- One or more of the authors has declared the following potential conflict of 
      interest or source of funding: This research was funded by a grant from the 
      Western Pennsylvania Chapter of the Arthritis Foundation.
EDAT- 2014/07/01 00:00
MHDA- 2014/07/01 00:01
PMCR- 2014/07/01
CRDT- 2015/11/05 06:00
PHST- 2015/11/05 06:00 [entrez]
PHST- 2014/07/01 00:00 [pubmed]
PHST- 2014/07/01 00:01 [medline]
PHST- 2014/07/01 00:00 [pmc-release]
AID - 10.1177_2325967114541220 [pii]
AID - 10.1177/2325967114541220 [doi]
PST - epublish
SO  - Orthop J Sports Med. 2014 Jul 11;2(7):2325967114541220. doi: 
      10.1177/2325967114541220. eCollection 2014 Jul.