ABSTRACT
Objective To investigate the correlation between subacromial space and acromial shoulder impingement syndrome (SIS).Methods The clinical and imaging data of 40 patients with SIS were collected and retrospectively reviewed.The shape of acromion and tears of rotator cuff of all patients were classified.A cromion-Humerus (A-H) distance was measured.Results Among 40 patients,there were 9 cases of type Ⅰ,12 cases of type Ⅱ,19 cases of type Ⅲ.32 patients had subacromial space narrowing.7 cases had calcification in the supraspinatus tendon and 10 patients had acromioclavicular joint ostcoarthritis.There were 17 cases of type Ⅰ,15 cases of type Ⅱ,18 cases of type Ⅲ of tears of rotator cuff.6 patients had subacromial bursa thickening,5 patients had subacromial-deltoid sac fluid and 10 patients had the joint capsule fluid.2 patients had jointlabrum avulsion,3 patients had the supraspinatus muscle atrophy and 4 patients had Bankart Lesion.There was no significant difference was found in A-H distance measured with X-ray and MRI(P =0.137 0).There was positive correlation between the A-H distance and class of rotator cuff(r =0.545,P =0.000 1).Conclusion There exists some correlation between subacromial space and SIS.The diagnosis and class of SIS can be assessed according to narrowing range of subacromial space.
ABSTRACT
Objective To study the correlation between anatomical measurement and CT measurement of adult occipital thickness so as to provide anatomic evidence for the selection of screw length in occipital-cervical fusion. Methods The occipital thickness was measured on the occipital specimens of 10 normal adults in two ways: direct anatomic measurement and CT measurement. Measurements were made on the basis of the McRac' s line and according to a matrix of 66 points following a grid with one cm spacing. The results of both measurements were statistically analyzed using SPSS 10.0. Results The results of both measurements were highly correlated. The external occipital protuberance was the thickest while the region of cerebellar fossa was the thinnest. The regions two cm lateral to the midline between plane Five and plane Six, one cm lateral to the midline between plane Four and at plane Five, and median between plane Three and plane Four were found to have a thickness of more than eight mm. Conclusions The occipital thickness varies with individuals. CT measurement and direct anatomic measurement are highly correlated. Preoperative CT measurements can be reliable evidence for optimal screw placement before performing occipital-cervical fusions.