Aims

The primary aim of this study was to evaluate the performance and safety of magnetically controlled growth rods in the treatment of early onset scoliosis. Secondary aims were to evaluate the clinical outcome, the rate of further surgery, the rate of complications, and the durability of correction.

Aims

Magnetically controlled growing rods (MCGRs) allow non-invasive correction of the spinal deformity in the treatment of early-onset scoliosis. Conventional growing rod systems (CGRS) need repeated surgical distractions: these are associated with the effect of the ‘law of diminishing returns’.

The primary aim of this study was to quantify this effect in MCGRs over sequential distractions.

Aims

We undertook a prospective non-randomised radiological study to evaluate the preliminary results of using magnetically-controlled growing rods (MAGEC System, Ellipse technology) to treat children with early-onset scoliosis.

We assessed the frequency and causes of neurological deterioration in 59 patients with spinal cord injury on whom reports were prepared for clinical negligence litigation. In those who deteriorated neurologically we assessed the causes of the change in neurology and whether that neurological deterioration was potentially preventable. In all 27 patients (46%) changed neurologically, 20 patients (74% of those who deteriorated) had no primary neurological deficit. Of those who deteriorated, 13 (48%) became Frankel A. Neurological deterioration occurred in 23 of 38 patients (61%) with unstable fractures and/or dislocations; all 23 patients probably deteriorated either because of failures to immobilise the spine or because of inappropriate removal of spinal immobilisation. Of the 27 patients who altered neurologically, neurological deterioration was, probably, avoidable in 25 (excess movement in 23 patients with unstable injuries, failure to evacuate an epidural haematoma in one patient and over-distraction following manipulation of the cervical spine in one patient). If existing guidelines and standards for the management of actual or potential spinal cord injury had been followed, neurological deterioration would have been prevented in 25 of the 27 patients (93%) who experienced a deterioration in their neurological status.

Cite this article: Bone Joint J 2015;97-B:527–31.

To determine extent of correction in spinal osteotomy for fixed sagittal plane deformity

Radiographic retrospective cohort analysis using standardised standing whole spine radiographs. Level III evidence

24 patients (14 females/10 males, av. 53.6 yrs) with sagittal plane deformity due to either ankylosing spondylitis (4), idiopathic (12), congenital (1), tumour (2), infectious (1), or posttraumatic (4) aetiologies. Max. 4 yrs follow up

Sagittal balance, lumbar lordosis correction, osteotomy angle, pelvic indices

Chevron (3), pedicle subtraction (17), and vertebral column resection (4) osteotomies were performed with the majority at L3 (9) and L2 (8). The C7-S1 sagittal vertical axis demonstrated a preoperative decompensation averaging 12.0 cm (range -7 to 37) with 55% of patients achieving normal sagittal balance postoperatively. Lumbar lordosis increased from 28.9° (range -28 to 63) to 48.9° (range 12 to 69) (22.3° av. correction). L3 osteotomy angle was largest, average 31° (range, 16 to 47). There were 11 complications comprising; major (1) and minor (1) neurological, junctional kyphosis (3), metalwork problems (2), dural tear (2) and infection (2). Four patients required additional surgery at latest follow-up. Technical outcome was good 11(50%), fair 8(36%), poor 3(14%).

Spinal osteotomy is a very effective technique to correct fixed sagittal imbalance and provide biomechanical stability. The high complication rate mandates a careful assessment of the risk/benefit ratio before undertaking what is a major reconstructive procedure. Most patients are satisfied, particularly when sagittal balance is achieved.

To compare the effect of intraoperative red cell salvage on blood transfusion and cost in patients undergoing idiopathic scoliosis surgery.

Retrospective

37 patients (36 females, 1 male) underwent scoliosis surgery from February 2007 to October 2008. Intraoperative red cell salvage (Group 1) was used. They were compared with 28 patients (23 females, 5 males) operated from January 2005 to December 2006 without the use of cell salvage (Group 2). 36 patients in group 1 had posterior surgery and 1 had anterior surgery. In Group 2, 20 patients had posterior surgery, 7 anterior and 1 patient had anterior and posterior surgery. Both groups were comparable for age, number of levels fused, preoperative haemoglobin and haematocrit values.

Amount of perioperative blood transfusion, costs

14 patients (50%) in group 2 had blood transfusion whereas only 6 (16%) were transfused blood in group 1. Average blood loss in group 1 was 1076 mls (range 315-3000) and 1626mls (419-4275) in group 2. An average of 2 units of packed red blood cells per patient was processed by the cell salvage system. Postoperative haemoglobin, haematocrit and hospital stay were comparable in both groups. Cost analysis shows the use of cell salvage is cost beneficial by £116.60 per case.

The use of red blood cell salvage reduces the amount of blood transfusion and is cost beneficial.

A literature review of bone graft substitutes for spinal fusion was undertaken from peer reviewed journals to form a basis for guidelines on their clinical use.

A PubMed search of peer reviewed journals between Jan 1960 and Dec 2009 for clinical trials of bone graft substitutes in spinal fusion was performed. Emphasis was placed on RCTs. Small and duplicated RCTs were excluded. If no RCTs were available the next best clinical evidence was assessed. Data were extracted for fusion rates and complications.

Of 929 potential spinal fusion studies, 7 RCTs met the inclusion criteria for BMP-2, 3 for BMP-7, 2 for Tricalcium Phosphate and 1 for Tricalcium Phosphate/Hydroxyapatite (TCP/HA). No clinical RCTs were found for Demineralised Bone Matrix (DBM), Calcium Sulphate or Calcium Silicate. There is strong evidence that BMP-2 with TCP/HA achieves similar or higher spinal fusion rates than autograft alone. BMP-7 achieved similar results to autograft. 3 RCTs support the use of TCP or TCP/HA and autograft as a graft extender with similar results to autograft alone. The best clinical evidence to support the use of DBMs are case control studies. The osteoinductive potential of DBM appears to be very low however. There are no clinical studies to support the use of Calcium Silicate.

The current literature supports the use of BMP-2 with HA/TCP as a graft substitute. TCP or HA/TCP with Autograft is supported as a graft extender. There is not enough clinical evidence to support other bone graft substitutes.

This study did not require ethics approval and no financial support was received.

To establish the incidence of litigation in Cauda Equina Syndrome (CES) and the causes of litigation.

Review of 10 years of abbreviated records of the National Health Service litigation authority (NHSLA) (1997-2007) and eight years of medical negligence cases (MNC) reported on by the two senior authors (2000-2008).

Patients who experienced CES and litigated. There were 117 patients in the NHSLA records and 23 patients in the MNC group.

Review of timing of onset, delay in diagnosis, responsible specialist, place, and resulting symptoms

NHSLA cases. 62/117 cases were closed. The responsible specialists were as follows

The commonest failure was delay in diagnosis, and the commonest complications were “neurological”, bladder and bowel.

MNC cases. F:M;17/6. L4/5 13 cases, L5/S1 9 cases. The responsible specialist was orthopaedic (7), other (7) and in 8 cases the opinion was that there was no case to answer. Delay to treatment averaged 6.14 days. 18/23 patients described bowel and bladder symptoms, the information was not available in the remainder.

Litigation is major problem in CES. In most cases orthopaedic surgeons are litigated against, and bowel and bladder symptoms remain the most disturbing cause of litigation. These surgeons are mostly not spinal specialists. In most successful cases of litigation there is considerable delay in diagnosis and management. Where there is incomplete Cauda Equina Syndrome urgent or emergency investigation and treatment is mandatory.

Aim

We report our ten year experience of primary haematogenous non-tuberculous spinal infection.

Background: Clonidine is an 2 adrenoreceptor and imidazoline receptor agonist which has analgesic, sedative and MAC sparing effects. It has been used orally, intravenously (including as an additive to morphine in PCA devices) and epidurally in combination with local anaesthetics and alone. We hypothesised that epidural administration of clonidine without local anaesthesia might provide adequate postoperative analgesia following spinal surgery without centroneuraxial block, and that if the drug’s effect site is spinal then this might be achieved with smaller doses and with fewer side effects than if given systemically.

Method: This randomised controlled trial evaluated the effect of epidural clonidine versus saline on analgesia requirement and pain scores following spinal decompressive surgery. 66 patients were recruited and received a standardized general anaesthetic. At the end of surgery group C received a bolus of 1.5 mcg/kg of epidural clonidine followed by an infusion of 25 mcg/h for 36 to 48 hours. Patients in group P received a similar bolus and infusion of saline. Verbal pain scores, morphine consumption by patient-controlled device (PCA), sedation score, haemodynamic variables and the incidence of PONV were recorded for up to 48 hours.

Results: Pain scores in both groups were low, but significantly lower for the first 6 hours in the clonidine group. Cumulative morphine consumption, used as a proxy for pain perception, was significantly lower in the morphine group throughout the whole period; mean (SEM) at 48 hours 62 (7) mg vs 35 (7) mg.

Conclusion: Epidural clonidine has a useful effect in post operative pain relief following spinal surgery with few side effects.

Aim: To report our ten year experience of primary haematogenous spinal infection.

Method: Retrospective case note review of 42 patients presented to our unit with primary spinal infection between 1995–2005 was carried out. Demographic data, timing and modes of presentation, investigations, and methods of treatment were analysed. Information with regard to Mobility, Domestic circumstances, Oswestry disability index(ODI), Hospital Anxiety and depression score(HAD), Visual Analogue Score (VAS) for pain and coping were obtained. The cost benefit of Home Intravenous Antibiotics Service (HIAS) was also investigated.

Results: Mean age was 59.9 years (1–85) with almost equal gender distribution (M 20: F 22). Axial pain was universal. Pyrexia was seen in 62%. Time from presentation to diagnosis averaged 19days (range 0–172). Sensitivity for MRI and plain x-ray was 100% and 46% respectively. Treatment ranged from intravenous antibiotics alone to combined anterior and posterior surgery depending on the presence or absence of significant collection, neurological deficit and structural threat. Mean duration of intravenous antibiotics was 54 days (range 13–240). At mean follow up of 5.4 years (0.6–10.5) there was no mortality directly related to the infection. Recurrence rate was 14%. Significant past medical history(P=0.001), constitutional symptoms(p=0.001) and pyrexia at presentation(0.001) were positively associated with recurrence.

Mobility score dropped in 34% patients whilst domestic circumstances’ score dropped only in 34%. ODI averaged 18% (range 0–53%). Mean HAD for anxiety and depression was normal for 86% and 93% of patients respectively. VAS for pain averaged 1.3 (range 0–9) and that for distress was 1.8 (range 0–9).

Overall it was calculated that HIAS had saved a total of 940 in-patient days.

Conclusion: Primary spinal infection is a treatable condition. Disease and patient characteristics dictate the management strategy. Although most patients can regain their pre infection mobility and go back to their pre morbid domestic circumstances with little or no pain and psychological sequel, a proportion of patients end up with moderate to severe disability, pain and psychological problems despite successful treatment of the primary infection. Finally, HIAS was cost effective.

Aim: In this study we present our ten year experience of primary spinal infection.

Method: Retrospective case note review of 42 patients who presented to our institution with primary spinal infection between 1995–2005 was carried out. Demographic data and information with regard to timing and modes of presentation, results of radiological and laboratory investigations, and methods of treatment were collected. The financial impact of Home Intravenous Antibiotics Service (HIAS) was also investigated.

Results: Axial pain was the most consistent symptom seen in 100% of the patients. Only 62% had pyrexia at presentation. Major neurological deficit was seen in 10.2%.

Mean duration of symptoms was 25 days (range 1–202). Mean time from presentation to diagnosis was 19 days (range 0–172). Staphylococcus Aureus was the most common organism. Mean duration of Intravenous antibiotics was 60 days (range 13–240) followed by oral antibiotics for mean duration of 65 days (range 0–161). CRP was more reliable in monitoring the disease over time. At mean follow up of 5.4 years (0.6–10.5) there has been no mortality directly related to the infection. With our management there has been 14% recurrence rate. All re- presenting within the first year after initial presentation (Mean 5.5 Months, range 1–11).

HIAS saved a total of 940 in-patient days with a total cost saving of approximately £350,000.00.

Conclusion: In the majority of patients spinal infection can be successfully treated. Disease severity dictates the duration of antibiotic treatment and whether surgery is required. Recurrent infection occurred in a number of patients with more significant past medical history and pre-existing risk factors. Finally, HIAS is extremely cost effective in this group of patients.

Aim: To assess the functional outcome following spinal infection.

Method: 42 patients who had been treated in our unit for primary spinal infection between 1995–2005 were identified. 33 who were still alive at the time of study, were sent postal questionnaires. Average length of follow up was 5.4 years (rang 0.6–10.5). The non-respondents were contacted by phone two weeks later. Overall 29 (88%) were traced.

Results: Mobility score dropped in 10 (34%) patients whilst domestic circumstances’ score dropped only in 1 (3.4%). Oswestry disability score averaged 18% (range 0–53%). 16 (62%) had mild or no disability, 7(27%) had moderate and 3 (12%) had severe disability. Neck disability index in all those with cervical spine infection was between 10–20% indicating mild disability. Hospital anxiety and depression score for anxiety was normal for 25 (86%) and that for depression was normal for 27(93%) patients. Ten point Visual Analogue Score (VAS) for pain intensity when doing the questionnaire averaged 1.3 (range 0–9) with 19 (66%) having no pain, 9 (31%) mild to moderate (1–5 score) and 1 (3%) having severe pain (6–10 score). Mean VAS over one week was 1.8(range 0–9) with 14(48%) having no pain, 13(45%) mild to moderate and 2 (7%) having severe pain. VAS for distress averaged at 1.8 (range 0–9), 22 (76%) patients were coping very well (8–10 score) and poor coping (0–4 score) was seen in 1 (3%).

Conclusion: Most patients after spinal infection return to activities of daily living with little or no pain and psychological sequelae. A proportion of patients however end up with moderate to severe disability, pain and psychological problems despite successful treatment of the primary infection.

To assess whether epidural steroid injection [ESI] is effective in the treatment of nerve root pathology caused by compression in the lumbar spine secondary to either spinal stenosis or disc prolapse, we carried out a prospective randomised controlled trial; patients were randomised either to ESI or Intramuscular steroid injection, with minimum two year follow-up.

Ninety two patients with symptoms, signs and radiological findings consistent with lumbar nerve root compression suitable for surgical decompression.

The main outcome measures were the Oxford Pain Chart over the first month, Oswestry Disability Index, and the need for surgery.

There was a significant reduction in pain early on after ESI compared with controls [p=< 0.004] between 10 and 35 days. There was no difference in the long term between the two groups and the rate of surgery in the two groups was not significantly different. Indeed the rate of surgery was higher in the ESI group than the control group [41% vs.31%] but this was not significant. A second ESI did not change the likelihood that surgery would be required.

Conclusion: ESI is effective for early pain relief for lumbar nerve root compression. However it does not change the natural history of the condition and does not reduce the ultimate need for surgery. It is probably effect to “buy time” in acute sciatica until improvement occurs naturally.

Study design: A prospective comparison of MRI findings with surgical findings in patients presenting to our spinal triage service with a prospective diagnosis of a lumbar disc herniation.

Objective: To investigate consistency between radiologists interpretation of MRI scans, and comparison between MRI and surgical findings, in an attempt to identify those patients suitable for percutaneous treatment.

Background: MRI has assumed a preeminent position in the diagnosis of lumbar disc prolapse.

Methods: 87 consecutive patients presenting with signs and symptoms suggestive of a lumbar disc prolapse that underwent an MRI and based on that a discectomy.

Results: Reliability tests show only fair agreement (k=0.36) between the radiologists and at best only moderate agreement (k=0.41) between the radiologists and surgical findings.

Conclusions: MRI is an excellent tool for diagnosis of a disc prolapse but does not appear to help in classifying discs suitable for percutaneous treatment.

Study design: A prospective comparison of MRI findings with surgical findings in patients presenting to our spinal triage service with a prospective diagnosis of a lumbar disc herniation.

Objective: To investigate consistency between Radiologists’ interpretation of MRI scans, and comparison between MRI and surgical findings, in an attempt to identify those patients suitable for percutaneous treatment.

Background: MRI has assumed a pre-eminent position in the diagnosis of lumbar disc prolapse.

Methods: 87 consecutive patients presenting with signs and symptoms suggestive of a lumbar disc prolapse that underwent an MRI and based on that a discectomy.

Results Reliability tests show only fair agreement (k=0.36) between the Radiologists and at best only moderate agreement (=0.41) between the Radiologists and surgical findings.

Conclusion: MRI is an excellent tool for diagnosis of a disc prolapse. MRI is poor at defining the character of a disc prolapse, and does not appear to help in classifying discs suitable for percutaneous treatment.

Study Design: A six-year retrospective analysis of all instrumented spinal fusions performed in the Nuffield Orthopaedic Centre and the John Radcliffe Hospital.

Objective: To assess the incidence of infection following instrumented spinal fusion, the nature of the infecting organisms and their subsequent management.

Subjects: All patients who had undergone removal of spinal metalwork were analysed for evidence of infection. The indications for removal of metalwork included proven deep infection, refractory postoperative pain or planned removal after thoraco-lumbar fracture.

Outcome Measures: Successful treatment of infection was documented when the patient was asymptomatic and inflammatory markers remained within normal limits following cessation of antibiotic therapy. Failure was documented when the patient had recurrent sepsis, refractory pain following removal of metalwork or died.

Results: 80 spinal infections following instrumented fusions were found between 1997 and 2003. 34 of the infecting organisms were propionibacteria, 19 were coagulase negative staphylococcus, 10 were staphylococcus aureus, 8 were methicillin resistant staphylococcus aureus, 3 were coliforms, 2 were proteus, 2 were diphtheroids, 1 was alpha haemolytic streptococcus and 1 was anaerobic streptococcus. 29 of these infections were polymicrobial. Of 55 patients who had metalwork removed secondary to pain, 20 patients had proven infection postoperatively (36.3%). Preoperative inflammatory markers failed to accurately predict the presence of infection for trauma patients. Our management of infection is removal of metalwork with six intraoperative samples sent for culture and histology specimens, followed by administration of at least six weeks of intravenous or oral antibiotic, depending on the organism and its antibiotic sensitivity. Prolonged treatment is used where inflammatory markers remain raised.

Conclusions: Infection of spinal implants presents different management problems to those which follow infected total joint replacement. The lack of specific clinical, laboratory and radiological findings in patients who are subsequently diagnosed as having infections associated with spinal instrumentation presents a challenging clinical problem. We found the most predictive sign of infection following instrumented fusion of scoliotic spines was postoperative pain. CRP and ESR were unreliable as predictors of infection.

Introduction and Aims: A multicentre trial of 349 patients of candidates for spinal fusion (where both patient and surgeon were uncertain of the outcome) were randomised to either an operation or to an intensive rehabilitation program. Rehabilitation was based on a three-week (15-day) model of exercise therapy and education using cognitive behavioural principles.

Method: The main outcome measures were the Oswestry Disability Index (ODI); Shuttle Walking Test; SF-36 and EuroQol EQ-5D recorded at baseline and six, 12 and 24 months after randomisation. The trial was 90%-powered to show a four-point ODI difference between groups at a= 0.05. Full economic analysis is available.

Results: Patients in both treatment arms made statistically significant improvements on all outcome measures between baseline and two-year follow-up. There was a small difference between the treatment arms favouring surgery on one of the main outcome measures, the Oswestry Disability Index; there were no statistically significant differences between the two treatment strategies for the rest. The difference in the change of score for the ODI was a decrease of 3.2 (C.I -7.3 – 0.9) in favour of surgery (p< 0.1), an improvement of 30 metres on the shuttle walking test in favour of the surgery group (p< 0.2), a difference of 0.01 on the Euroqol (p< 0.9) and an increase of 2.7 points on the SF-36 (p< 0.4).

The surgery results parallel those reported in other trials. At two years, the treatment costs of the surgery arm were approximately twice those of the rehabilitation arm. The costs of the rehabilitation strategy depend on how many patients opt to have surgery after rehabilitation (22% in this trial). This is a comparison of treatment strategies: there was no clinical or statistical difference in outcome between the strategy of spinal fusion and rehabilitation.

Conclusion: Patients randomised to both surgery (spinal stabilisation) and rehabilitation have indicated a treatment effect, but this may be due to natural history. ‘Failed’ non-operative treatment is commonly listed as an indication for surgery, this should only be considered once an intensive rehabilitation program backed by the treating surgeon has been tried.

We have assessed whether an epidural steroid injection is effective in the treatment of symptoms due to compression of a nerve root in the lumbar spine by carrying out a prospective, randomised, controlled trial in which patients received either an epidural steroid injection or an intramuscular injection of local anaesthetic and steroid. We assessed a total of 93 patients according to the Oxford pain chart and the Oswestry disability index and followed up for a minimum of two years. All the patients had been categorised as potential candidates for surgery.

There was a significant reduction in pain early on in those having an epidural steroid injection but no difference in the long term between the two groups. The rate of subsequent operation in the groups was similar.

Objective: To assess whether Webb Morley Instrumentation had satisfactory long term results.

Design: A retrospective review of 52 patients who underwent fusion and instrumentation with Webb Morley Instrumentation between 1991–1997.

Subjects: 52 patients were reviewed, 32 patients with idiopathic scoliosis who underwent isolated anterior fusion, 19 patients with neuromuscular scoliosis who underwent anterior and posterior surgery.

Outcome measures: Preoperative and postoperative radiographs, ISIS scans, and patient review. The in-patient notes were assessed for duration of surgery, blood loss, hospital stay and complications. Correction of Cobb angle and union were assessed.

Results: In the idiopathic group Cobb angle improved by 57%, apical rotation by 36% and tilt angle by 56%. There were no major complications and all united. The implant has a tendency to kyphose the spine, and an average of 7 degrees of kyphosis was seen across the implant. In the neuromuscular group Cobb angle improved by 52%, apical rotation by 21% and tilt angle by 57%. There was one asymptomatic pseudarthrosis, two rod breakages and two posterior rod dissociations. Only one patient complained of significant back pain.

Conclusions: Webb Morley instrumentation offers results as good as most other anterior implant systems. The flexibility of the rods may be a relative advantage, with a high union rate. Although the implant tends to kyphose the spine this has not been a problem clinically at follow-up of 4-11 years. This may help in design of future implants.