The best replacement for impingement is rotator cuff tear.

The best alternatives to impingement are rated as following:
★★★★★  rotator cuff tear
★★★  entrapment
★★  piston
★★  slap tear
★★  rotator cuff
★★  frozen shoulder
★★  gas piston
★  secondary impingement
★  rotator cuff tendonitis
★  bursitis
★  bicipital tendonitis
  piston driven
  piston ar15
  gas operated
  torn labrum
  torn rotator cuff

Your alternative for impingement is not listed? Suggest!
Speaking about impingement, one probably shouldn't forget about bursitis.

Other search terms related to impingement and their ratings are:
★★★★★ bursitis
★★★★ labral tear
★★ spur
★★ rotator cuff tear
★ rotator cuff
★ adhesive capsulitis
★ tendonitis
★ acromioclavicular joint
subacromial bursitis
an intact rotator cuff
frozen shoulder
painful arc
labral tair
supraspinatus tendinosis
You have in mind a companion for impingement and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of impingement in all years. Click on graph for more.
impingement
rotator cuff tear
entrapment