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Table 2 CT Scan Frequency for each Procedure by Year: All Patients at 6 months Follow-up

From: Utilization of CT scanning associated with complex spine surgery

Procedure 2007 2008 2009 2010 2011 2012 2013 2014
Cervical Fusion, n (%) (N = 105) (N = 135) (N = 201) (N = 209) (N = 249) (N = 291) (N = 382) (N = 339)
 No. of Scans 1 81 (77) 107 (79) 142 (71) 156 (75) 174 (70) 214 (74) 297 (78) 274 (81)
  2 17 (16) 18 (13) 40 (20) 39 (19) 47 (19) 53 (18) 64 (17) 48 (14)
  3 * (*) * (*) 11 (5) * (*) 17 (7) 19 (7) 15 (4) 11 (3)
  4+ * (*) * (*) * (*) * (*) 11 (4) * (*) * (*) * (*)
Lumbar Fusion, n (%) (N = 119) (N = 165) (N = 220) (N = 253) (N = 335) (N = 413) (N = 521) (N = 474)
 No. of Scans 1 88 (74) 137 (83) 167 (76) 207 (82) 264 (79) 332 (80) 430 (83) 391 (82)
  2 24 (20) 17 (10) 41 (19) 31 (12) 54 (16) 63 (15) 65 (12) 52 (11)
  3 * (*) * (*) * (*) * (*) * (*) 11 (3) 22 (4) 22 (5)
  4+ * (*) * (*) * (*) * (*) * (*) * (*) * (*) * (*)
Other, n (%) (N = 223) (N = 305) (N = 430) (N = 461) (N = 563) (N = 690) (N = 909) (N = 798)
 No. of Scans 1 169 (76) 246 (81) 317 (74) 358 (78) 420 (75) 528 (77) 722 (79) 646 (81)
  2 39 (17) 37 (12) 84 (20) 70 (15) 96 (17) 117 (17) 134 (15) 99 (12)
  3 * (*) 15 (5) 14 (3) 20 (4) 24 (4) 31 (4) 41 (5) 37 (5)
  4+ * (*) * (*) 15 (3) 13 (3) 23 (4) 14 (2) 12 (1) 16 (2)
Discectomy, n (%) (N = 228) (N = 314) (N = 313) (N = 392) (N = 300) (N = 264) (N = 309) (N = 279)
 No. of Scans 1 154 (68) 243 (77) 233 (74) 281 (72) 224 (75) 196 (74) 242 (78) 214 (77)
  2 56 (25) 55 (18) 55 (18) 78 (20) 53 (18) 51 (19 42 (14) 48 (17)
  3 13 (6) * (*) 14 (4) 21 (5) 11 (4) * (*) 15 (5) * (*)
  4+ * (*) * (*) 11 (4) 12 (3) 12 (4) * (*) * (*) * (*)
Laminectomy, n (%) (N = 249) (N = 325) (N = 419) (N = 475) (N = 577) (N = 695) (N = 809) (N = 774)
 No. of Scans 1 191 (77) 242 (74) 304 (73) 328 (69) 432 (75) 509 (73) 578 (71) 587 (76)
  2 50 (20) 58 (18) 84 (20) 109 (23) 100 (17) 131 (19) 163 (20) 131 (17)
  3 * (*) 13 (4) 17 (4) 27 (6) 35 (6) 32 (5) 38 (5) 29 (4)
  4+ * (*) 12 (4) 14 (3) 11 (2) * (*) 23 (3) 30 (4) 27 (3)
  1. *Patient volumes fewer then 11 are denoted with an asterisk (*) to protect patient privacy