This is what MEpedia currently presents:
https://www.me-pedia.org/wiki/Craniocervical_instability#Outcomes.2C_risks_.26_complications
Surgery
When non-invasive treatments for CCI fail to work, occipito-cervical fusion (OCF) can be considered.
[13] OCF is a surgery that aims at a biomechanical stabilization of the craniocervical junction. Patients with objective radiological findings, a clinical picture supportive of the diagnosis, a positive response to traction, and who are significantly impaired may be candidates for this surgery. A common method involves internal fixation of the upper spine to the skull by mechanical rods and screws. (However, rod-wire, rigid rod-screws, occipital hooks and cervical claws are all methods currently in use.
[47]) During surgery, titanium hardware is used to fixate the occiput, axis and atlas (i.e., C0 to C2) while rib graft or cadaver bone graft is used to help the bones fuse together. Wire methods are less biomechanically stable than rod methods and have high rates of dural laceration.
[47] Screw and rod fixation methods have lower complication rates and higher rates of successful fusion.
[48] Fusion rates across all hardware methods range from 89 to 100%.
[47] When cervical instability is present below C2, additional vertebrae may also be fused if the patient is symptomatic.
Outcomes, risks & complications
The outcome of OCF is generally favorable with most patients experiencing symptom relief post-surgery.
[13] The complications of OCF however can be serious
[49] and occur in an estimated 7% to 33% of patients.
[3][48][2][50][47] Common complications include screw failure, wound infection, dural tear and cerebrospinal fluid leakage
[2] In some cases revision surgery is needed to treat infection or to remove hardware. Severe complications can include meningitis and accidental injury of the vertebral artery by misplaced screws.
[51]
A meta-study of 2274 procedures across 22 studies
[47] found the following complication rates:
Complication type Prevalence rate
Hardware failure after fusion non-union 7%
Wound infection 3.8%-11%
Vertebral artery damage 1.3%-4.1%
Dural tears 0% to 4.2%
Meta-studies place the rate of death from fusion surgery at 0-0.6%.
[47][48]
Side effects
OCF causes a substantial reduction in the neck’s range of motion, estimated at approximately 40% of total cervical flexion–extension.
[52]