A shift toward endovascular repair for vascular complications in lumbar disc surgery during the last decade.

BACKGROUND: The purpose of this study is to evaluate 2 patients who underwent endovascular repair directly after acute life-threatening vascular injury complicating lumbar disc surgery, and to update an overview of the literature from 2002 to gain insights into characteristics, diagnosis, treatment, and outcomes of this rare, life-threatening complication. METHODS: PubMed was searched for English language studies on vascular injury (lacerations, arteriovenous fistulas, and pseudoaneurysms) complicating lumbar disc surgery by a posterior approach published from 2002. Two cases from the authors' institute were added to the review. Information on patient characteristics, diagnosis, treatment strategies, and outcomes were extracted by 2 independent reviewers. CASE REPORTS: The first case describes a 54-year-old man who underwent lumbar disc surgery through a posterior approach (L5-S1) and became hypotensive intraoperatively. Angiography revealed an injury of the right internal iliac artery. Bleeding was successfully repaired by endovascular repair (acute balloon occlusion followed by coiling). The second case describes a 51-year-old women who suddenly became hypotensive during L4 through L5 discectomy caused by bleeding from a laceration in the right common iliac artery. Angiography confirmed the diagnosis, and the bleeding was successfully treated through endovascular repair with a covered stent. RESULTS: A total of 56 cases from 34 articles were found in the literature since 2002, including lacerations, arteriovenous fistulas, and pseudoaneurysms. Two cases from the authors' institute were added to the review. Vascular injury was recognized intraoperatively in 36%, and within 24 hours postsurgery in 28%. The common iliac artery was most frequently affected (51%), followed by the iliac vein (23%). All lacerations were detected during surgery, whereas most arteriovenous fistulas and pseudoaneurysms were detected in the long term. Treatment consisted of open surgical repair (57%) or endovascular repair (43%). All patients survived surgery. CONCLUSIONS: Publication bias might play a role in the literature of this area because all cases survived surgery, whereas mortality rates for this condition are high. However, early recognition, diagnosis, and prompt surgical repair are essential to prevent fatal outcomes in vascular injuries complicating lumbar disc surgery. Endovascular repair is a minimally invasive, fast, and efficient treatment modality that is increasingly and preferably used because of its low morbidity and mortality.

Breast milk metal ion levels in a young and active patient with a metal-on-metal hip prosthesis.

Metal-on-metal resurfacing arthroplasty of the hip has been used increasingly over the last 10 years in younger active patients. The dissolution of the metal wear particles results in measurable increases in cobalt and chromium ions in the serum and urine of patients with a metal-on-metal bearing. We measured the cobalt, chromium, and molybdenum ion levels in urine; serum; and breast milk in a young and active patient with a metal-on-metal hip prosthesis after a pathologic fracture of the femoral neck. Metal-on-metal hip prosthesis leads to increasing levels of molybdenum in breast milk in the short-term follow-up. There are no increasing levels of chromium and cobalt ions in breast milk. Besides the already known elevated concentrations in serum of chromium and cobalt after implantation of a metal-on-metal hip prosthesis, we found no increasing levels of chromium and cobalt in urine.

Polyethylene wear and rim fracture in total disc arthroplasty.

BACKGROUND CONTEXT: Polyethylene (PE) has been used in total disc replacements (TDRs) in Europe since the 1980s. However, the extent of surface damage of PE, including rim fracture and wear, after long-term implantation remains poorly understood. PURPOSE: The purpose of this study was to evaluate the magnitude and rate of PE wear and surface damage in TDRs. STUDY DESIGN: TDR components were retrieved from patients undergoing revision TDR surgery and conversion to fusion. PATIENT SAMPLE: Twenty-one implants (SB Charité III; DePuy Spine, Raynham, MA) were analyzed from 18 patients (12 female, 6 male) undergoing TDR revision surgery. The components were implanted between 1.8 and 16.0 years (average: 7.8 years) at L2-L3 (n=1), L3-L4 (n=1), L4-L5 (n=11), and L5-S1 (n=8). They were removed due to pain (in all cases) and were associated with subsidence (n=6), anterior migration (n=2), core dislocation (n=2), lateral subluxation (n=1), wear with wire marker fracture (n=1), end plate loosening (n=2), and osteolysis (n=1). OUTCOME MEASURES: Clinical information was collected from medical records and radiographs. Retrieval analysis included dimensional measurements and assessment of the extent and severity of PE surface damage mechanisms. METHODS: MicroCT scanning was used to identify the presence of internal cracks in the PE core and to scan the geometry of the retrievals. Light microscopy, coupled with white light interferometry, was used to evaluate the surface damage mechanisms at the dome and rim. RESULTS: The dominant wear mechanism was adhesive/abrasive wear at both the dome and rim. End plate penetration (dome wear) ranged from 0.1 to 0.9 mm (average: 0.3 mm), and was correlated with implantation time (Spearman's rho=0.48, p=.03). There was also evidence of macroscopic rim damage, including radial and transverse cracking, fracture, plastic deformation, and third-body damage. End plate penetration measured at the rims ranged from 0.02 to 0.8 mm (average: 0.3 mm). Cracks in the core were oriented transversely in 11 of 21 implants (52%), and radially around the rim in 11 of 21 implants (52%). Radiographic wire marker fracture, observed in 9 of 21 implants (43%), was always associated with deformation, cracking, or fracture of the PE rim. In two cases, a fractured wire marker became lodged in the articulating surface between the PE and the metallic end plate. CONCLUSIONS: This is the first study to quantitatively analyze the long-term PE damage mechanisms in contemporary TDRs. The TDRs displayed surface damage observed previously in both hip and knee replacements. Because of the evidence of increasing wear with implantation time, along with the demonstrated potential for osteolysis in the spine, regular long-term follow-up for patients undergoing TDRs is warranted.

Calcifications in the cuff: take it or leave it?

OBJECTIVES: The aim of this study was to evaluate whether removing the calcifications in the rotator cuff tendons during surgical subacromial decompression improves outcome in patients with calcific tendonitis. METHODS: Two groups of 20 patients with a subacromial impingement syndrome and cuff calcifications were operated on. In group A, patients had an anterolateral acromioplasty according to Neer with excision of calcifications. In group B, the same procedure was performed without additional excision of calcifications. After a minimum follow-up of 3 years the patients were assessed with the disabilities of arm, shoulder and hand score (DASH), the visual analogue scale (VAS) for pain, measurements of range of motion (ROM) in all planes, and satisfaction with treatment. RESULTS: The results for the DASH score, ROM, VAS and satisfaction with treatment showed no significant difference between the two groups. CONCLUSION: The results of our study suggest that removal of calcific deposits with anterolateral acromioplasty does not influence patient outcome. Further prospective studies are needed to determine the optimal surgical treatment for calcific tendonitis.

Chordoma of a thoracic vertebra. A case report.

A 51-year-old woman presented with aspecific clinical symptoms of the thoracic spine. Radiological survey showed a tumour mass at T3-T4. Initial microscopic evaluation was suggestive of renal cell carcinoma metastasis. Lack of a primary tumour and revision of the specimens changed the diagnosis into chordoma.

Relationship of serotonergic antidepressants and need for blood transfusion in orthopedic surgical patients.

BACKGROUND: Several reports of various bleeding problems associated with the use of serotonergic antidepressants have been published. However, no information concerning the effect of these drugs on perioperative blood loss and blood transfusion requirements during orthopedic surgery is available. The objective of this study was to determine the association between use of serotonergic antidepressants and perioperative blood loss and transfusion in orthopedic surgical patients. METHODS: A retrospective follow-up study, using routinely collected hospital and pharmacy data, was conducted among all orthopedic patients undergoing surgery from January 1, 1999, through December 31, 2000. The actual blood transfusion requirements and blood loss during surgery were assessed. Patients were divided into 3 groups for comparison: users of serotonergic antidepressants, users of nonserotonergic antidepressants, and nonusers of antidepressants. The Medical Ethics Committee approved the study protocol, and informed consent was obtained from all patients or their legal relatives. RESULTS: A total of 520 subjects with evaluable data participated in the study. The risk of blood transfusion almost quadrupled for the serotonergic antidepressant group as compared with the nonusers (adjusted odds ratio, 3.71; 95% confidence interval, 1.35-10.18). Patients using nonserotonergic antidepressants had no increased risk (odds ratio, 0.74; 95% confidence interval, 0.10-5.95). CONCLUSIONS: Use of serotonergic antidepressants is associated with an increased risk of bleeding and subsequent need for blood transfusion during orthopedic surgery. The bleeding could be attributed to inhibition of serotonin-mediated platelet activation.

Prospective clinical follow-up after percutaneous vertebroplasty in patients with painful osteoporotic vertebral compression fractures.

PURPOSE: To prospectively assess short-term, midterm, and long-term pain relief in patients with painful osteoporotic vertebral compression fractures (VCFs) treated with percutaneous vertebroplasty (PV). MATERIALS AND METHODS: Visual analog scale (VAS) scores for pain at the treated vertebral level, analgesic use, and satisfaction with outcome were assessed in 112 patients after PV of 168 VCFs. Serial follow-up was performed at 24 hours and 3, 6, and 12 months and in a small number of patients at 1-3 years. Procedure-related complications were evaluated by physical examination and computed tomography of treated levels. RESULTS: After PV, VAS scores for pain at the individual vertebral levels treated and use of analgesic agents were significantly reduced compared with before treatment at every follow-up period. Within 24 hours after the procedure, the decreases in all scores were less compared with scores at later follow-up periods, but this was not significant. The preprocedural mean VAS score was 8.8 (range, 5-10). At follow-up, mean VAS scores ranged from 2.5 to 3.3 (range, 0-10). In the short term after PV, patients used significantly less analgesic drugs and 86% of patients were satisfied with the outcome. At midterm and long-term follow-up, patients used even less analgesic drugs and 95%-100% of patients were satisfied with the outcome of PV. Procedure-related complications with clinical consequences occurred in three patients (2.7%): one patient experienced a cardiovascular reaction, one patient had a pedicle chip fracture, and one had a rib fracture. CONCLUSION: PV of painful osteoporotic VCFs provides significant pain reduction in nearly all treated patients.