Table 3.

Summary of patients with craniovertebral junction anomalies

Age (year)/sex	Procedure Executed	ADI (mm)			CL (mm)			WCCL (mm)
		Preoperative	Postoperative	Dt	Preoperative	Postoperative	Dt	Preoperative	Postoperative	Dt
23/female	C1 lateral mass and C2 pedicle screw and rod fixation	4.5	1.4	3.1	+7.3	+5.1	2.2	3.6	−1.5	5.1
50/male	Sub occiput and C2-C3 fixation with foramen magnum decompression by removal of posterior arch of C1	3.4	4.4	−1.0	+6.6	+3.8	2.8	8.6	5.2	3.4
32/male	C1 lateral mass and C2 pedicle screws and rod fixation with C1-C2 spacer placement	5.1	3.8	1.3	+10.6	+6.3	4.3	+6.6	+0.2	6.4
20/male	Reduction of AAD and BI with occipital plate and C2 pedicle screw and rod fixation	5.4	5.2	0.2	+12.9	+11.4	1.5	+3.3	+3.0	0.3
40/female	Reduction of AAD with C1-C2 trans articular fixation	8.4	7.2	1.2	+7.4	+5.2	2.2	+8.9	+7.6	2.3
12/female	Foramen magnum decompression with removal of posterior arch of C1 with C2 pedicle and occipital screw and rod fixation	4.2	3.1	1.1	+7.5	+7.0	0.5	+3.5	−2.9	6.4
7/male	C1 C2 lateral mass pedicle screw and rod fixation with C1-C2 bone graft placement and distraction of joint with removal of posterior arch of C1	8.7	6.7	2.0	−9.9	−15.8	5.9	+12.3	−2.8	15.1
55/male	C1 lateral mass and C2 pedicle screw and rod fixation with C1 C2 joint fusion with bone	4.4	3.2	1.2	−12.4	−13.6	1.2	−8.2	−8.8	0.6
18/female	Foramen magnum decompression with removal of occipitalized C1 posterior arch with cord decompression with C2 trans laminar screw and occipital plate and rod fixation	7.5	5.4	2.1	+9.9	+3.1	6.8	+9.1	−1.8	10.9
20/female	C1-C2 spacer placement with C1 lateral mass and C2 translaminar screw and rod placement	6.3	3.0	3.7	−2.8	−5.6	2.8	−2.4	−11.2	8.8
11/male	Occipital plate with C2 lateral mass screw and rod fixation with C1 C2 fusion using autologous bone	6.9	5.4	1.5	+10.2	+3.9	6.3	+12.0	+5.6	6.4
8/female	Occiput-C2 fixation using rod and screw with bilateral spacer at C1-C2 joint with foramen magnum decompression	7.2	6.5	0.7	−3.6	−11.5	7.9	−6.0	−14.4	8.4
33/male	C1 posterior arch decompression with C1-C2 spacer insertion with sub occiput and C2 pedicle screw and rod fixation	2.2	1.9	0.3	+21.2	+15.3	5.9	−4.9	−4.6	0.3
26/female	Bilateral C1-C2 fixation using C1 lateral mass and C2 translaminar screw and rod placement	8.5	8.3	0.2	−12.2	−14.4	2.3	−5.1	−12.6	7.5
46/male	Foramen magnum decompression with decompression and debulking	1.9	1.8	0.1	+18.5	+9.7	8.8+	+10.0	+9.6	0.4
	Cerebellar tonsils with augmented duroplasty with occiput and C3-C4 fixation using plate screw and rod
19/female	Reduction of AAD and BI with C1-C2 spacer and occipital plate and C2 translaminar screw and screw and rod fixation	7.1	5.1	2.0	+10.2	+6.2	4.0	+8.6	+3.4	2.2
14/male	C1 lateral mass and C2 left pedicle, right pars screws and rods fixation with placement of spacer into right C1-C2 joint	5.8	2.1	3.7	+4.4	+0.4	4.0	−1.2	−4.6	3.4
11/male	Occipital C2 fusion with right C2 pedicle screw and left C2 laminar screw with rod fixation with C1-C2 distraction and autologous bone placement between C1-C2	4.3	3.9	0.4	+7.9	+6.4	1.5	+10.2	+2.4	7.8

+ – Above line; − – Below line; ADI – Atlanto dental interval; CL – Distance between odontoid tip and chamberlain line; WCCL – Distance between Odontoid tip and Wackenheims line; Dt – Distraction achieved; AAD – Atlantoaxial dislocation; BI – Basilar invagination