PURPOSE: To evaluate the clinical features, imaging characteristics, surgical options, and clinical outcomes of @entity1 with @entity3799 ( @entity3799 ) caused by single-level vertebral spontaneous fusion (SLVSF). METHODS: Sixteen consecutive @entity1 with SLVSF who underwent anterior surgery were included in this study and 38 @entity1 with @entity3799 caused by @entity528 were enrolled as a control group. Demographic features, clinical presentations, imaging characteristics, surgery strategy, Nurick grade, Japanese Orthopedic Association (JOA) score, @entity717 ( @entity717 ), and complications were evaluated. RESULTS: There were significant differences between the two groups in the mean age and the average duration of @entity4048 . There was no significant difference between the two groups in length of cervical spine. In the SLVSF group, 13 @entity1 had upper segment translational instability and none had rotational instability. Pre- and postoperative Nurick grades were 2.94  0.77 and 2.19  0.54 in the SLVSF group, and 2.97  0.72 and 2.16  0.64 in the control group. Pre- and postoperative JOA scores were 9.25  2.02 and 11.69  1.62 in the SLVSF group, and 9.87  2.58 and 12.53  2.69 in the control group. Pre- and postoperative @entity717 values were 28.5  7.75 and 15.56  5.51 in the SLVSF group, and 16  6.13 and 11.29  4.58 in the control group. CONCLUSIONS: @entity1 with SLVSF have necks of normal lengths, which can be used to distinguish this disorder from @entity11375 . There are three main features of SLVSF: (1) @entity509 at both of the spontaneously fused vertebral bodies; (2) a major pathological feature of translational instability of the upper vertebra to the fused level; and (3) severe @entity4048 . Anterior surgery has a good therapeutic effect for @entity1 with cervical SLVSF.

XXXX caused by single-level vertebral spontaneous fusion.

@entity1 :: ('9606', 'Species') :: ['Patients', 'patients'] @entity11375 :: ('MESH:D007714', 'Disease') :: ['Klippel-Feil syndrome'] @entity509 :: ('MESH:C538429', 'Disease') :: ['hypoplasia'] @entity3799 :: ('MESH:D002575', 'Disease') :: ['Cervical spondylotic myelopathy', 'CSM'] @entity4048 :: ('MESH:D019547', 'Disease') :: ['neck pain'] @entity717 :: ('MESH:D009069', 'Disease') :: ['NDI', 'neck disability index'] @entity528 :: ('MESH:D009410', 'Disease') :: ['spinal degeneration']
@entity3799 :: (MESH:D002575,Disease) :: ['Cervical spondylotic myelopathy']
