Removal versus preservation of the posterior longitudinal ligament in Bryan cervical disc arthroplasty

Background Bryan cervical disc arthroplasty can be used to restore and maintain the mobility and function of the involved cervical spinal segments. The efficiency of posterior longitudinal ligament （PLL） resection in anterior cervical decompression and fusion has been demonstrated. However, no clinical reports have compared PLL removal with preservation in Bryan cervical disc arthroplasty. This study aimed to assess the role of removal of PLL in Bryan cervical disc arthroplasty at an 18-month follow-up.