Hemiparesis resulting from an unusual C1 fracture: A case report and literature review.

BACKGROUND: Jefferson fractures are burst fractures involving both the anterior and posterior arches of C1. They typically result from axial compression or hyperextension injuries. Most are stable, and neurological deficits are rare. They are often successfully treated with external immobilization, but require surgery (e.g., fusion/ stabilization). CASE DESCRIPTION: An 89-year-old male presented with a left-sided hemiplegia following a trivial fall. The cervical computed tomography scan revealed a left-sided displaced comminuted C1 fracture involving the arch and lateral mass. The MR revealed posterior cord compression and focal myelomalacia. Six months following an emergent C1-C3 decompression with occiput to C4 instrumented fusion, the patient was neurologically intact and pain-free.
CONCLUSION: An 89-year-old male presented with a left-sided hemiplegia due to a Type 3/4 C1 Jefferson fracture. Following posterior C1-C3 surgical decompression with C0-C4 instrumented fusion, the patient sustained a complete bilateral motor recovery. Copyright:

INTRODUCTION

Jefferson fractures are burst fractures involving both the anterior and posterior arches of C1; they account for 2–13% of all cervical fractures.[6,7] Although they classically result from traumatic axial compression/hyperextension injuries, violent rotation of the head and neck may also rarely contribute to/cause these C1 lesions.

The majority of C1 fractures are stable (e.g., with unruptured transverse ligaments) in neurologically intact patients and can be treated with external immobilization alone.[2] Alternatively, unstable C1 fractures and those with accompanying neurological deficits may require decompression/fusion surgery (e.g., occiput C0–C2).

Here, we present an 89-year-old male, who following trivial trauma, sustained a left-sided C1 Jefferson fracture, resulting in hemiplegia. This was successfully managed with a C1–C3 surgical decompression and C0–C4 instrumented fusion.

CASE REPORT

Following a trivial fall, an 89-year-old right handed male with hypertension, chronic renal failure, and orthostatic hypotension, acutely presented with a flaccid left-sided hemiplegia. He complained of severe neck pain, a limited range of cervical motion, and left lower extremity Lhermitte’s signs (e.g., “electric-like/lightening sensations”). On examination, he was hemiplegic in the left upper (0/5) and lower extremity (1/5) (e.g. the right sided weakness was mild (4/5) in these distributions) and had intact sensory and sphincter function. After 1 hour in the emergency room, his left upper extremity paralysis improved to a 1–2/5 strength level.

Radiologic imaging

The cervical CT revealed a displaced comminuted C1 arch fracture on the left that involved the left lateral mass of C1 there was an accompanying diathesis of 10 mm [Figures 1 and 2]. There were also multiple bone fragments in the spinal canal. A single fracture of the posterior arch of C1 was also noted on the right side (e.g., diathesis of 3 mm), accompanied by an additional fracture of the left occipital condyle. The CT angiogram did not reveal a vertebral artery dissection, and/or thrombosis. The MR posterior cord compression at the C1 level; there was also focal myelomalacia and/or a high intrinsic cord signal (T2W study) with severe cord compression at C3/4 [Figures 3 and 4].

Figure 1:

Preoperative cervical axial computed tomography scan demonstrating C1 fracture pattern of the anterior and posterior arches, involving also the right lateral mass.

Figure 2:

Preoperative coronal computed tomography scan demonstrating the C1 fracture pattern of the lateral mass.

Figure 3:

Preoperative cervical axial magnetic resonance imaging demonstrating cord compression from the fracture pattern with myelomalacia.

Figure 4:

Preoperative sagittal magnetic resonance imaging short-TI inversion recovery sequence demonstrating myelomalacia at C1 and severe stenosis at C3/4 level.

Surgery

The patient underwent an emergent C1–C3 laminectomy with occiput (CO)–C4 instrumented fusion. Under fluoroscopy, bilateral C1 lateral mass screws, bilateral C2 pars interarticular screws, and C4 lateral mass screws were applied; no C3 lateral mass screws could be placed due to technical interference from the C2 screw heads. Occipital plates/rods were placed bilaterally from C0-C4 [Figures 5 and 6].

Figure 5:

Lateral cervical X-ray done postoperatively at 6 months’ time showing intact hardware.

Figure 6:

Open mouth view X-ray done postoperatively at 6 months’ time showing reduction of C1C2 lateral mass displacement.

Postoperative course

Immediately postoperatively, the patient regained strength in both his upper and lower extremities (4/5). He was discharged to a rehabilitation facility 14 days later without any residual deficits. Six months postoperatively, his neck pain resolved, and X-rays showed no subsequent instrument-related complications.

DISCUSSION

C1 atlas factures can be divided into five different types based on the fracture location patterns[1] [Table 1]. The classical Jefferson fracture, Type III, is a four part fracture, where both the anterior and the posterior arches are fractured twice. Note, C1 fractures with two or three fracture parts may also occur.

Table 1:

Jefferson classification.

Here, the initial CT scan showed a fracture of the left lateral mass involving the anterior arch, and a single fracture of the right-sided posterior arch. There was also an associated left occipital condyle fracture. This constituted a Type 3/4 C1 fracture [Figure 1].

Neck pain is the most common presentation for C1 Jefferson fractures, as these fractures typically do not present with neurological deficits; the large diameter of the spinal canal is further widened by the centrifugal displacement of the fragments.[3] As such, a high degree of suspicion for a C1 fracture must be maintained, especially when a patient presents with a trivial trauma and neck pain.

The integrity of the transverse ligament determines the stability of Jefferson fractures.[7] Although nonoperative management may be appropriate with slight C1 displacement in the presence of an intact transverse ligament, unstable Jefferson fractures typically warrant surgery. Surgical options include C1–C2 fixation, with occipitocervical fusion reserved for those with the most complex findings. Although there have been reports of direct fixation of C1 only,[4] pseudoarthrosis is not a viable option in our opinion. Our case of an unstable Type III fracture involving both anterior, posterior, and lateral mass is cited to have a 33.3% prevalence of nonunion with either operative and nonoperative management.[5] Furthermore, with ongoing compression both the C1–C2, and C3–C4 levels, the patient warranted a multilevel (C1–C3) posterior cervical decompression with occipitocervical fusion (C0–C4).

CONCLUSION

After a fall, an 89-year-old male presented with a Type 3/4 C1 Jefferson fracture that resulted in an acute left-sided flaccid hemiplegia. Following a C1–C3 laminectomy and CO–C4 fusion, the patient fully recovered.