C1 lateral mass screws are best placed beneath the posterior arch, parallel with the arch in the sagittal plan. The entry point is the medial border of the neural arch at its junction with the lateral mass. Straight ahead screw direction is safe in the axial plane, but up to 20 degrees of medial angulation will increase the safety margin from the vertebral artery foramen, and this technique avoids vertebral artery damage and optimizes lateral mass screw purchase. We suggest that this is the preferred method of entry into the lateral mass of C1.
Spinal manipulative therapy performed by chiropractors is increasingly common in the United Kingdom. Spinal epidural haematoma is a rare complication of such physical therapy but when identified represents a neurological emergency. We describe the case of a 64 year-old man who presented with a dense hemiplegia due to a spinal epidural haematoma following cervical spine manipulation performed for acute neck pain. The clinical features and surgical management of the case are discussed and we stress the importance of recognition of chiropractic manipulation as a potential cause of neurological sequelae and discuss the potential pitfalls of such therapy as it becomes more widespread.
Osteoradionecrosis is a rare but recognised complication of radiotherapy. Cases have been described in the cervical spine following treatment for head and neck malignancies up to 25 years after administration of radiotherapy. We present a rare case of osteoradionecrosis affecting the L5 and S1 vertebral bodies in a 58-year-old woman who presented with low back pain 25 years after undergoing a hysterectomy with adjuvant radiotherapy for cancer of the cervix.
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