上下斜方肌不平衡可能导致肩峰下撞击症

jacky

Upper and Lower Trapezius Imbalances May Cause Subacromial Impingement

MARCH 8, 2010 6 COMMENTS

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A new journal article in Physical Therapy in Sport (the journal I recently reviewed) discusses imbalance between upper and lower trapezius muscle activity and the association of subacromial impingement.

The authors studied the EMG activity of the upper and lower trapezius in subjects with and without subacromial impingement.  Results show that subjects with impingement had a greater ratio of upper to trapezius to lower trapezius than the control group.  There was a large difference in group size (16 impingement subjects, 32 control), which is a limitation, I wonder why they choose to include so many controls.

Asymptomatic subjects had a upper trap (UT) to lower trap (LT) ratio of 1.80 while symptomatic subjects had a ratio of 3.15.  What this means is that the upper trapezius is a little more than 3 times more active than the lower trapezius during scapular plane elevation in patients with subacromial impingement.  This was a statistically significant finding.

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