Figure 2. Flow of Participants in the Cervical Spondylotic Myelopathy Surgical Trial.

The majority of the 189 patients screened who did not enroll were not eligible. Some were unwilling to complete study questionnaires or to consider randomization. A few ultimately did not choose to have surgery or had their surgery at another institution.

^aOne patient randomized to ventral surgery underwent dorsal fusion surgery.

^bFour patients randomized to dorsal surgery underwent ventral fusion surgery.