Dynamic ultrasound assessment of medial meniscal subluxation in knee osteoarthritis.
OBJECTIVE
Although clinical reports have described medial meniscal subluxation (MMS) in knee OA, few controlled studies have used dynamic US to examine the potential impact of MMS on OA. The aim of this study was to assess MMS in patients with knee OA and in asymptomatic controls by US in different weight-bearing positions.


METHODS
In a cross-sectional controlled study, MMS was evaluated by US in 33 symptomatic OA knees and in 13 control knees in supine neutral and unipodal weight-bearing positions. The reproducibility of US in this setting was assessed and the US measurements were compared between patients and controls.


RESULTS
MMS was observed more frequently in OA knees than in controls in the unipodal weight-bearing position both before (P = 0.014) and after (P = 0.035) walking 50 m. In both OA and control knees, an increase in MMS was observed in the unipodal weight-bearing positions compared with the supine neutral position, but this increase was greater in OA knees than in controls (P < 0.001).


CONCLUSION
Our findings confirm clinical observations that the medial meniscus undergoes significant subluxation in knee OA. The degree of subluxation is greater in weight-bearing than in non-weight-bearing positions. Dynamic US is a reproducible method for the assessment of MMS.
['Acebes|Carlos|C|', 'Romero|Fredeswinda I|FI|', 'Contreras|Maria A|MA|', 'Mahillo|Ignacio|I|', 'Herrero-Beaumont|Gabriel|G|']
D000368:Aged D016001:Confidence Intervals D003430:Cross-Sectional Studies D005260:Female D006801:Humans D015994:Incidence D004204:Joint Dislocations D008297:Male D008592:Menisci, Tibial D008875:Middle Aged D020370:Osteoarthritis, Knee D011379:Prognosis D012016:Reference Values D015203:Reproducibility of Results D018570:Risk Assessment D012720:Severity of Illness Index D018608:Ultrasonography, Doppler D016474:Weight-Bearing
dynamic ultrasound meniscal subluxation knee osteoarthritis