Article Figures & Data
Figures
- Figure 1
Five types of lumbar endplates: Type I - Flat endplate; Type II - Posterior hooked endplate; Type III - Concave endplate; Type IV - Convex endplate; Type V - Combined endplates.
- Figure 2
A) Preoperative Type II endplate. (B) Postoperative Type II endplate with anterior positioning of superior L5 endplate due to posterior L5 hook anatomy.
- Figure 3
(A) Preoperative Type IV endplate. (B) Type IV endplate with convex S1 endplate and subsequent lack of endplate coverage.
Tables
Patient Group L3-L4 L4-L5 L5-S1 Total Patients (n = 80) 6 51 62 Single Level (n= 41) 2 12 27 Multilevel (n= 39) 4 39 35 Multilevel (n= 39) 4 39 35 Observer Type I Type II Type III Type IV Type V 1 90/ 82/ 85 16 / 26 / 23 7 / 5 / 5 4 / 4 / 4 2 / 2 / 2 2 87 / 88 / 88 9 / 9 / 6 17 / 15 / 17 4 / 6 / 7 2 / 1 / 1 3 78 / 78 / 66 7 / 9 / 8 19 / 18 / 24 12/ 11 / 20 3 / 3 / 1 Data represents the number of disc levels given that rating at first observation / second observation / third observation
Observer 1 Observer 2 Observed Agreement (n = 119)* Kappa Value (95% CI) Session 1 1 92 (77%) 0.47 (0.32 to 0.62) 2 88 (74%) 0.38 (0.22 to 0.54) 3 86 (72%) 0.41 (0.19 to 0.51) Session 2 1 84 (71%) 0.42 (0.23 to 0.53) 2 83 (70%) 0.48 (0.22 to 0.52) 3 77 (65%) 0.39 (0.10 to 0.40) Session 3 1 83 (70%) 0.48 (0.19 to 0.49) 2 85 (71%) 0.39 (0.22 to 0.52) 3 81 (68%) 0.44 (0.15 to 0.45) Average 84 (71%) 0.42 ↵* Data are given as the number of disc levels, with percentage in parentheses
Observer 1 Observer 3 Observed Agreement (n = 119)* Kappa Value (95% CI) Session 1 1 80 (67%) 0.46 (0.18 to 0.46) 2 85 (71%) 0.41 (0.27 to 0.55) 3 71 (60%) 0.38 (0.15 to 0.39) Session 2 1 76 (64%) 0.37 (0.17 to 0.45) 2 80 (67%) 0.47 (0.23 to 0.51) 3 73 (61%) 0.44 (0.22 to 0.46) Session 3 1 77 (65%) 0.37 (0.18 to 0.44) 2 82 (69%) 0.45 (0.25 to 0.53) 3 73 (61%) 0.37 (0.22 to 0.44) Average 77 (65%) 0.41 ↵* Data are given as the number of disc levels, with percentage in parentheses
Observer 2 Observer 3 Observed Agreement (n = 119)* Kappa Value (95% CI) Session 1 1 88 (74%) 0.47 (0.32 to 0.62) 2 91 (76%) 0.52 (0.37 to 0.67) 3 80 (67%) 0.41 (0.27 to 0.55) Session 2 1 90 (76%) 0.52 (0.37 to 0.67) 2 97 (82%) 0.62 (0.48 to 0.76) 3 85 (71%) 0.48 (0.34 to 0.62) Session 3 1 92 (77%) 0.53 (0.38 to 0.68) 2 94 (79%) 0.57 (0.42 to 0.72) 3 84 (71%) 0.46 (0.32 to 0.60) Average 89 (75%) 0.51 ↵* Data are given as the number of disc levels, with percentage in parentheses
Observations Observed Agreement (n = 119)* Kappa Value (95% CI) P Value Observer 1 1 and 2 98 (82%) 0.60 (0.45 to 0.75) .000 2 and 3 106 (89%) 0.76 (0.64 to 0.88) .000 1 and 3 103 (87%) 0.70 (0.56 to 0.84) .000 Average 102 (86%) 0.69 Observer 2 1 and 2 99 (83%) 0.61 (0.46 to 0.76) .000 2 and 3 107 (90%) 0.76 (0.63 to 0.89) .000 1 and 3 99 (83%) 0.61 (0.45 to 0.77) .000 Average 102 (86%) 0.66 Observer 3 1 and 2 96 (81%) 0.64 (0.51 to 0.77) .000 2 and 3 99 (83%) 0.71 (0.60 to 0.82) .000 1 and 3 91 (76%) 0.60 (0.47 to 0.73) .000 Average 95 (80%) 0.65 ↵* Data are given as the number of disc levels, with percentage in parentheses
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