OBJECTIVE: @entity309 @entity1 may develop a @entity75 ( @entity309 ) that may cause cervical @entity16 . The objective is to characterize clinical and radiographic outcomes after posterior instrumented fusion for @entity309 . METHODS: We retrospectively reviewed all @entity1 who underwent posterior fusions for an @entity309 at a single institution. Both preoperative and postoperative imaging was available for all @entity1 . Anterior or circumferential operations, non-atlantoaxial panni, or prior C1-C2 operations were excluded. Primary outcome measures included Nurick score, Ranawat score (neurologic status in @entity1 with @entity309 ), @entity2070 regression, and reoperation. @entity2070 volume was determined with axial and sagittal views on both preoperative and postoperative radiological images. RESULTS: Thirty @entity1 surgically managed for an @entity309 were followed for a mean of 24.43 months. Nine @entity1 underwent posterior instrumented fusion alone, while 21 @entity1 underwent posterior decompression and instrumented fusion. Following a posterior instrumented fusion in all 30 @entity1 , the @entity2070 statistically significantly regressed by 44.44%, from a mean volume of 1.26cm(3) to 0.70cm(3) (p<0.001), over 8.02 months. The Nurick score significantly improved from 2.40 to 0.60 (p<0.001), but the marginal improvement of 0.20 in the Ranawat score did not reach significance (p=0.312). Six @entity1 (20%) required reoperations over a mean of 13.18 months. Reoperations were indicated for C1 instrumentation failure in four @entity1 and @entity1516 in two @entity1 . CONCLUSION: Following posterior instrumented fusion, the @entity2070 radiographically regressed by 44.44% over a mean of 8.02 months, and @entity1 clinically improved per the Nurick score. The Ranawat score did not improve, and 20% of @entity1 required reoperation over a mean of 13.18 months. The annualized reoperation rate was approximately 13.62%.

Regression of an XXXX following posterior instrumented fusion.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity75 :: ('MESH:D001927', 'Disease') :: ['retrodental lesion'] @entity16 :: ('MESH:D009422', 'Disease') :: ['instability and/or neurological compromise'] @entity2070 :: ('MESH:C537858', 'Disease') :: ['Pannus', 'pannus'] @entity309 :: ('MESH:D001172', 'Disease') :: ['atlantoaxial rheumatoid pannus', 'Rheumatoid', 'rheumatoid arthritis'] @entity1516 :: ('MESH:D011542', 'Disease') :: ['pseudoarthrosis']
@entity309 :: (MESH:D001172,Disease) :: ['atlantoaxial rheumatoid pannus']
