Acquired spondylolysis after implantation of a lumbar ProDisc II prosthesis: case report and review of the literature.
ABSTRACT A case of acquired lumbar spondylolysis following lumbar disc arthroplasty L5-S1 in an 40-year-old woman and review of the literature.
To present and discuss a case of acquired lumbar spondylolysis after implantation of an artificial disc L5-S1 that may have impaired a good clinical result requiring additional posterior lumbar instrumentation and fusion in order to improve understanding of this condition and to propose an effective method of surgical management.
Lumbar disc arthroplasty is a possible surgical option for patients with degenerative disc disease. Acquired spondylolysis is a rare but known complication of spinal fusion but has never been described as a consequence of mobile disc arthroplasty. The authors present the first case in the literature who developed this complication.
A 40-year-old woman with severe osteochondrosis L5-S1 and discogenic lumbar back pain underwent implantation of an artificial disc. Surgery and postoperative course were uneventful and the patient improved significantly as for back pain and mobility. Eighteen months after surgery, the patient was again admitted to our outpatient clinic for back pain that had slowly increased over time.
The radiologic workup showed a new spondylolysis L5 without a spondylolisthesis. Because of unsuccessful conservative treatment, the patient underwent posterior lumbar instrumentation and fusion L5-S1, leading to a significant pain reduction and a good clinical outcome.
Spine surgeons should be aware of the possibility of lumbar disc arthroplasty to induce acquired spondylolysis impairing good clinical results.
- SourceAvailable from: William D Harrison
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- "In one case of pedicle fracture with no dislocation conservative management was suitable . In all of the polyethylene inlay dislocations there was no attempt to revise the TDR and an interbody fusion was required in each case     . The mechanism of dislocation has been attributed to an unusual bilateral pars fracture, usually in the L5 vertebra, which causes spondylolisthesis and instability of the prosthesis. "
ABSTRACT: Study Design. Case report. Objective. To identify a safe technique for salvage surgery following complications of total disc replacement. Summary of Background Data. Lumbar total disc replacement (TDR) is considered by some as the gold standard for discogenic back pain. Revision techniques for TDR and their complications are in their infancy. This case describes a successful method of fixation for this complex presentation. Methods and Results. A 48-year-old male with lumbar degenerative disc disease and no comorbidities. Approximately two weeks postoperatively for a TDR, the patient represented with acute severe back pain and the TDR polyethylene inlay was identified as dislocated anteriorly. Subsequent revision surgery failed immediately as the polyethylene inlay redislocated intraoperatively. Further radiology identified bilateral pedicle fractures, previously unseen on the plain films. The salvage fusion of L5/S1 reutilized the anterior approach with an interbody fusion cage and bone graft. The patient was then turned intraoperatively and redraped. The percutaneous pedicle screws were used to fix L5 to the sacral body via the paracoccygeal corridor. Conclusion. The robust locking screw in the percutaneous screw allowed a complete fixation of the pedicle fractures. At 3-year followup, the patient has an excellent result and has returned to playing golf.11/2013; 2013:676017. DOI:10.1155/2013/676017
Conference Paper: Computer simulation of vacuum breakdown induced by hypervelocityimpact[Show abstract] [Hide abstract]
ABSTRACT: Computer simulation of hypervelocity interaction of copper needle-like projectiles (with velocities in range: 10-15 km/s) with thin copper electrodes in a vacuum under different applied voltages (1-30 kV) and external circuit parameters was produced by using a two-dimensional thermoelectrohydrodynamical code. The nonlinear plasma-emissive processes-the generation and dynamics of so called cathode and anode ectons-are numerically investigatedDischarges and Electrical Insulation in Vacuum, 1996. Proceedings. ISDEIV., XVIIth International Symposium on; 08/1996