Abstract
Introduction
C1-C2 fusion with instrumentation is an established treatment for C1-C2 instability due to trauma or inflammatory disease. C1-C2 fusion for debilitating occipitocervical pain secondary to C1-C2 osteoarthritis has been reported in a small number of patients. Here we report the successful treatment of three patients that underwent C1-C2 instrumented fusion using a modified Harm's technique for medically refractory occipitocervical pain.
Materials and Methods
Between August 2012 and July 2015, three consecutive patients with debilitating, unilateral occipitocervical pain and radiographic C1–2 osteoarthritis, underwent posterior instrumented C1-C2 arthrodesis using bilateral polyaxial C1 lateral mass and C2 pedicle screw and rod constructs (modified Harms technique). All three patients failed preoperative conservative treatment including therapy, medical management and interventional pain management including facet joint injections. In all three patients, the source of occipitocervical pain was confirmed preoperatively with direct C1-C2 joint injection using 0.5ml of a mixture of 2% lidocaine/0.5% Marcaine/10mg kenalog. All three patients had immediate but temporary relief of their occipitocervical pain from the diagnostic C1-C2 joint injection. Preoperative CT scan confirmed the presence of C1-C2 osteoarthritis on the symptomatic side. Outcome measures include pre and postoperative VAS, patient reported resolution of pain, hospital LOS, EBL and complications.
Results
Each of the three patients surgically treated had complete resolution (100%) of their preoperative occipitocervical pain beginning immediately after instrumented posterior fusion of C1–2. Average VAS improved from 8.3 preoperatively to 0.0 postoperative for the cohort. Average follow up is 33 months. Average age for the group at the time of surgery was 75 years old and the M:F ratio is 1:2. Hospital LOS was 1 day for each patient. EBL was 45ml on average with a range of 15ml - 75ml. There were no postoperative complications.
Conclusions
Instrumented posterior C1-C2 fusion, using a modified Harms technique, is a safe and effective treatment for refractory occipitocervical pain secondary to C1-C2 osteoarthritis. The source of pain should be confirmed preoperatively with both CT scan and diagnostic joint injection.