One reason would be a significant loss of motion. I'm not sure if it is the side to side or up and down. I'm sure there are other reasons, just my lay person's knowledge.
judy
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2007 ACDF 4-7
2008 hip , knee scope, hip replacement
2009 thoracic T-5 thru T-11fusion
2009 VATS T7-8, posterior only T11-12. removal of thoracic hard wear
2010 lung surgery
2010 T2-L2 kyphosis correction
2010 Kyphoplasty T-3, T-4
2011 Cervical osteotomy ,revision C4-T5
2011 Foot surgery
2011 Revision fusion T7 thru L4/laminectomy
2012 Hammertoe correction left foot
2012 Revision fusion T-12 thru L5
2012 Revision fusion L4-L5
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