الفهرس 
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Abstract
Purpose: To assess and compare the clinical and radio- graphical effectiveness of low
versus high, hydraulic pressure arthrocentesis for patient suffering from anterior disc
displacement without reduction.
Patients and Methods: The current study was conducted on twenty patients, all of
them are females ranging from 20 to 50 years (mean 30 years). History, clinical and
radiographic examinations (MRI) were used to select those patients suffering from
anterior disc displacement without reduction (closed lock). The included subjects
underwent MRI after arthrocentesis in not more than two weeks interval. The selected
patients were randomized into two equal groups. The first group included 10 females
(mean age of 30 years) and were treated by single needle arthrocentesis with
application of high pressure during irrigation. While second group involved 10
females (mean age of 31 years) and were treated with single needle arthrocentesis
with application of low pressure during irrigation, follow up was for three months.
Results: Our results revealed significant decrease in pain score at rest at 3 months
follow-up versus preoperative data for group one arthrocentesis (p=0.004), and there
was no statistically significant change for group two arthrocentesis (p=0.157). The
mean of assisted mouth opening showed significant increase through all periods of
follow-up versus preoperative data for group one arthrocentesis (p<0.001). There was
a statistically significant increase in mean of assisted MMO after 1 week, after 1 and 3
months. However, there was non-statistically significant increase in mean of assisted
MMO for group two arthrocentesis.
Conclusion: Adequate treatment results were achieved with application of high
pressure arthrocentesis technique rather than low one. MRI proved that no chance of
recapturing the disc even with application of high pressure technique.