On September 27, 2007, employee was working for employer in his role as a traffic police officer, when he responded to a report of an accident on the highway. It was rush hour, so employee parked his police cruiser in the right hand lane about a quarter mile ahead of the accident and activated his lights in order to divert traffic and provide protection for the officers and other personnel working at the accident site. A motorist driving an SUV approached employee's car from the rear and failed to slow down in time; the SUV tipped onto two wheels, hit the embankment or guardrail, then collided with employee's car.
Employee experienced immediate pain in his neck, back, and left shoulder, and received emergency treatment at the North Kansas City Hospital emergency room, where treating physicians diagnosed thoracic and cervical strains. On October 5, 2007, a cervical MRI revealed no changes from an earlier September 2006 MRI. (The September 2006 MRI had included findings of bulging discs at C4-5, C5-6, and C6-7, as well as an annular tear at C6-7.) On October 12, 2007, a left shoulder MRI revealed a change in the appearance of the AC joint with increased fluid and widening. The study also revealed a partial thickness tear of the distal supraspinatus tendon; the radiologist deemed this finding to be unchanged from a prior MRI study of September 2006.
On November 1, 2007, an orthopedic surgeon, Dr. Roger Hood, recommended left shoulder surgery. On November 21, 2007, Dr. Hood performed an open left Mumford procedure and acromioplasty. Dr. Hood found a .5" tear of the rotator cuff, which he repaired. Following the surgery, employee underwent physical therapy for the left shoulder.
Employee continued seeking treatment for ongoing severe neck and left shoulder pain. Treatment included diagnostic studies, physical therapy, prescription pain medications including narcotics, the use of a home traction unit for the neck, and epidural steroid injections. Employee did not experience significant improvement from any of these modalities.
On March 31, 2009, employer sent employee to Dr. Gill Wright for a return to duty exam. Dr. Wright formed a belief that employee's problems were related solely to degenerative disc disease and self limitations, and opined that there was no objective indication that employee could not return to full duty work as a police officer. Employer also sent employee to Dr. Jeffrey MacMillan on April 14, 2009. Dr. MacMillan rated employee's left