The current trend in kyphosis correction is for “every level” instrumentation to achieve intraoperative stability, correction, fusion and implant longevity. We evaluate the medium term follow up of a low implant density (LID) construct. All patients with adolescent kyphosis (idiopathic or Scheurmann's) on our deformity database were identified. Radiographs and records were analysed for neurological complications, correction and revision. The constructs included were all pedicle screw anchors with multiple apical chevron osteotomies and a proximal and distal “box” of 6 to 8 screws. A four rod cantilever reduction manoeuvre with side to side connectors completed the construct. Kyphosis for any other cause was excluded. Follow up less than 12 months was excluded. 23 patients were identified with an average follow up 27 months (72 to 12 months) and a mean implant density of 1.1 (53.5% of “available” pedicles instrumented). There was 1 false positive neurophysiological event without sequelae (4%). There were no proximal junctional failures (0%). There were no pseudarthroses or rod breakages (0%). There was 1 loss of distal rod capture (early set screw failure) (4%). This was revised uneventfully. There were 4 infections requiring debridement (early series). Average initial correction was 44% (77.7 degrees to 43.5 degrees) with a 1% loss of correction at final follow up (43.5 to 44.0 degrees). The fulcrum bending correction index was 107% (based on fulcrum extension radiographs). 85% of curves had a fulcrum flexibility of less than 50%. The average cost saving compared to “every level “instrumentation was £5700 per case. This paper shows that a LID construct for kyphosis has technical outcomes as good as high density constructs. The obvious limitation of the study is the small number of patients in the cohort. The infection rates have improved with changes to perioperative process in the later series of patients. We do not believe these are a consequence of the construct itself.
The purpose of this study is to investigate what effect cross links have on scoliosis constructs and whether cross links may be used instead of pedicle screws at the apex of the deformity The rotational stiffness of six different construct designs was investigated on scoliotic sawbone models with zero, one or two cross links. In three of the constructs the screws at the apex were removed. Testing was performed to an average torque of 3Nm and ration was detected using electromagnetic motion tracking system. The stiffness in axial rotation of all constructs increased with the number of cross links, however the difference was not statistically significant. In constructs with apical screws the stiffness increased by 3.01% and 12.9% for one and two cross links respectively. In constructs without apical screws the increase was 1.64% and 14.3% for one and two cross links respectively. The total stiffness of the construct increased with the addition of apical screws by 20%, 21.7% and 18.8% for zero, one and two cross links respectively. This increase was statistically significant using a paired t-test (p= 0.01142). On the basis of these results we conclude that the use of cross links in scoliosis correction surgery is not necessary. Pedicle screws positioned at the apex of the scoliosis curve statistically increase the stiffness in axial rotation and are therefore necessary to promote an environment suitable for bony fusion.
Shoulder balance after surgery is one main attribute of the cosmetic outcome. It has been difficult to assess on 2D images. The balance results from the interaction of rib cage, shoulder joint and scapular positions, spinal alignment and rotation, muscle size and co-ordination and pain interaction. Attempts have been made to predict shoulder balance from radiograph measurements. There is no consensus on this. To assess whether T1 tilt has any relation to final shoulder balance after surgery.Introduction:
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To evaluate the effect of intraoperative manoeuvres on the rib hump. Patients with AIS and a thoracic rib hump that underwent a modified Suk technique of scoliosis correction were included. The Scoligauge (Ockenden net) scolimeter app was used to measure the rib hump in Adam's position and the prone position preoperatively. The Scoligauge was used again with the patient prone in theatre, at the end of exposure of the spine, after a 90 degree rod rotation manoeuvre (CD), after a segmental derotation manoeuvre (SDR) and finally at skin closure. The patients were consented for the use of the app on the senior author's mobile device. The device was double bagged for use in theatre.Aim:
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To evaluate the effect of a stiffer rod in normalising thoracic hypokyphosis in adolescent idiopathic scoliosis (AIS). A retrospective review of AIS cases performed at our institution was carried out. In order to reduce variability, the analysis included only Lenke 1 cases which had all pedicle screw constructs, with similar constructs and implant density. Cases that underwent anterior release were excluded. All cases had the same implant (Expedium 5.5, Depuy-Synthes, Raynham, USA). The rod material differed in that some cases had 5.5 titanium, whilst others had 5.5 cobalt chrome. The preoperative and postoperative sagittal Cobb angle was measured.Aim:
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Scheuermann's kyphosis is a fixed round back deformity characterised by wedged vertebrae seen on radiograph. It is known patients presented with a negative sagittal balance before operation. Few studies investigated the outcome after operation, especially the change in the lumbar hyperlordosis. To investigate the change in sagittal profile after correction surgery.Introduction:
Aim:
Pedicle screw constructs (PSC) in scoliosis are a recently established and widely accepted method of managing scoliotic curves posteriorly. There is a perceived improved coronal and rotational correction when compared to other posterior only constructs. With continued use of this method, the authors and deformity surgeons in general have become aware of persistent thoracic hypokyphosis. This review of 3 years of scoliosis cases using PSC looks at four different implant strategies utilised to manage this problem and our current practice. These strategies were: All titanium 5.5 mm rod diameter (Expedium, Depuy spine) All titanium 5.5 mm rod diameter with periapical washers (Expedium, Depuy spine) All titanium 6.0 mm rod diameter (Pangea, Synthes) Titanium pedicle screws with 5.5 mm diameter cobalt chrome rods (Expedium Depuy spine) We have reviewed our outcomes with these strategies with respect to thoracic hypokyphosis. Strategy 1 had the highest rate of hypokyphosis on postoperative radiographs. Strategy 4 seems to have the best correction of coronal and sagittal plane abnormality post operatively. As a consequence, our current practice is the use of titanium pedicle screws and 5.5 mm diameter cobalt chrome rods when managing scoliosis with a pedicle screw construct.
We propose that Total Hip Replacement with correction of fixed flexion deformity of the hip and exaggerated lumbar lordosis will result in relief of symptoms from spinal stenosis, possibly avoiding a spinal surgery. A sequence of patients with this dual pathology has been assessed to examine this and suggest a possible management algorithm. A retrospective study of 19 patients who presented with dual pathology was performed and the patients were assessed with regards to pre and post-operative symptoms, walking distance, and neurological status.Introduction
Materials and methods
To describe the prevalence and incidence of Methicillin-resistant Staphylococcus aureus (MRSA) colonisation during the patient journey for patients admitted to orthopaedic and trauma wards, we carried out a prospective audit at the University Hospital of North Staffordshire NHS Trust, England. The Study Population comprised patients admitted to the trauma and elective orthopaedic wards, with an expected stay of 48 hours or more between March and May 2003. Patients were swabbed for MRSA colonisation on ward admission, transfer to another ward and discharge from hospital. Elective patients undergoing major joint surgery were also swabbed at a pre-operative assessment clinic. Colonised patients were treated depending on individual risk assessment. Five hundred and fifty-nine eligible patients were admitted to hospital. Of these, 323 (101 elective, 192 trauma and 30 non-orthopaedic) patients were included in the study, of whom 28 elective patients (28%), 43 trauma patients (22%), and seven non-orthopaedic patients (23%) were colonised with MRSA at any time during the audit period. Of the 80 patients identified as negative for MRSA colonisation at pre-assessment screening and included in the audit, ten (9.5%) were found to be colonised on admission. There is a high prevalence of MRSA colonisation in patients admitted to the orthopaedic and trauma wards in our setting. A policy of pre-admission screening, though able to identify MRSA carriage does not guarantee that patients are not colonised in the period between screening and admission. Consideration should be given to screening all patients for MRSA who are admitted to an orthopaedic ward.
The average postoperative kyphotic angle was 41.1 degrees (range 25–54 degrees) giving an average correction of 42.2 degrees per patient. The average postop lumbar angle was 51.8 degrees (range 20–70 degrees). The average follow up time was 25.3 months (range 6–60 months). At follow up the kyphotic angle was found to be 42.8 degrees average (range 24–55 degrees) and the lumbar angle was 57.6 degrees average (range 42–70 degrees). This technique is superior as it avoids sudden stretching of the anterior vasculature and possible rupture of the anterior longitudinal ligament (ALL) and provides correction at multiple levels, avoiding build-up of stress at any single level.
Ossification of the posterior longitudinal ligament (OPLL) is a condition found predominantly in the oriental population and is rarely seen in non orientals. OPLL can present with cervical canal stenosis and myelopathy (including central cord syndrome), often following minor trauma. Co-existence of OPLL with diffuse idiopathic skeletal hyperostosis (DISH) is a rare condition and very few reports of such patients exist in literature. Here we report the case of a Caucasian with co-existing DISH and OPLL, presenting with acute central cord syndrome associated with fracture of the ossification. A 64 year old Caucasian farmer was transferred to our spinal unit with weakness in the right upper limb following a road traffic accident. On examination he had hyperaesthesia in both upper limbs and motor power of grade 4 in the right upper limb with a distal motor power of grade 3 in the hand. There was no motor deficit in the left upper limb or lower limbs. Radiographs revealed an ossification of the posterior longitudinal ligament with a break at C2 and C3 levels. He also had exuberant soft tissue ossification in the cervical and thoracic spines, suggestive of diffuse idiopathic skeletal hyperostosis (DISH). He recovered completely in 6 weeks with non operative treatment. Fracture of the posterior longitudinal ligament has not been widely reported, although it is possibly more prevalent than is recognised. We report this case in order to highlight the importance of recognising this condition in non oriental populations and to demonstrate that non operative treatment has a good prognosis.
While previous studies have highlighted possible aetiological factors for adolescent idiopathic scoliosis (AIS), research employing gait measurements have demonstrated asymmetries in the ground reaction forces, suggesting a relationship between these asymmetries, neurological dysfunction and spinal deformity. Furthermore, investigations have indicated that the kinematic differences in various body segments may be a major contributing factor. This investigation, which formed part of a wider comprehensive study, was aimed at identifying asymmetries in lower limb kinematics and pelvic and back movements during level walking in scoliotic subjects that could be related to the spinal deformity. Additionally, the study examined the time domain parameters of the various components of ground reaction force together with the centre of pressure (CoP) pattern, assessed during level walking, which could be related to the spinal deformity. Although previous studies indicate that force platforms provide good estimation of the static balance of individuals, there remains a paucity of information on dynamic balance during walking. In addition, while research has documented the use of CoP and net joint moments in gait assessment and have assessed centre of mass (CoM)–CoP distance relationships in clinical conditions, there is little information relating to the moments about CoM. Hence, one of the objectives of the present study was to assess and establish the asymmetry in the CoP pattern and moments about CoM during level walking and its relationship to spinal deformity. The investigation employed a six camera movement analysis system and a strain gauge force platform in order to estimate time domain kinetic parameters and other kinematic parameters in the lower extremities, pelvis and back. 16 patients with varying degrees of deformity, scheduled for surgery within a week took part in the study. The data for the right and left foot was collected from separate trials of normal walking. CoP was then estimated using the force and moment components from the force platform. Results indicate differences across the subjects depending on the laterality of the major curve. There is an evidence of a relationship between the medio-lateral direction CoP and the laterality of both the main and compensation curves. This is not evident in the anterior-posterior direction. Similar results were recorded for moments about CoM. Subjects with a higher left compensation curve had greater deviation to the left. Furthermore, the results show that the variables identified in this study can be applied to initial screening and surgical evaluation of spinal deformities such as scoliosis. Further studies are being undertaken to validate these findings.
Scheuermann’s disease is defined as thoracic kyphosis greater than 45° with greater than 5° of anterior wedging in 3 consecutive vertebrae. We describe a new technique for the surgical treatment of thoracic kyphosis. Eleven patients were treated in our series. The average preoperative kyphotic angle was 83.3 degrees (58–94 degrees). Multiple posterior closing wedge osteotomy was performed and four rods (two proximal and two distal) were contoured and fixed to pedicle screws and the deformity reduced by the cantilever technique. The average postoperative kyphotic angle was 41.1 degrees (range 25–54 degrees) giving an average correction of 42.2 degrees per patient. The average postop lumbar angle was 51.8 degrees (range 20–70 degrees). The average follow up time was 25.3 months (range 6–60 months). At follow up the kyphotic angle was found to be 42.8 degrees average (range 24–55 degrees) and the lumbar angle was 57.6 degrees average (range 42–70 degrees). We find this technique simple and effective in reducing curves of high magnitude and the curve was maintained in the long term. Our complication rate was comparable to that quoted in literature. This technique is superior as it avoids sudden stretching of the anterior vasculature and possible rupture of the anterior longitudinal ligament (ALL) and provides correction at multiple levels, avoiding build-up of stress at any single level.
An urgent D12 decompression and biopsy of D12 was done with D10-L2 instrumentation. PSA levels were >
500ng/ml.Histopathology showed moderately to poorly differentiated adenocarcinoma with a cribriform pattern. Immunohistochemistry showed a strong staining for PSA consistent with metastatic adenocarcinoma of the prostate. Post-operatively, he regained bladder control and was referred to oncologists for further management.
Sublaminar wiring with posterior instrumentation is one of the methods used when long fusions involving 10 to 12 thoracolumbar levels are required. Classically wires are used at every consecutive level to make the construct as rigid as possible although complications like dural tears, CSF leak, and neurological deficiet have been reported during their passage. We compared the mechanical stability of five specimens of each of the three construct designs by static and fatigue testing to torsional strain on Electro-servo-hydraulic testing machine. In construct A, a contoured Hartshill rectangle was used from T2 to L2, with sub-laminar wires passed at every level. In construct B, every alternate level was wired. In construct C, every alternate level was wired except at the proximal end two consecutive levels were wired. Industrially fabricated spine models were used to prepare these constructs. The intervertebral motion within the construct was measured using FASTRAK magnetic field sensor device. On static testing, no statistically significant difference was found in the rotational displacement of the three construct designs. On fatigue testing, all samples of construct B consistently failed with breakage of the wire at the most proximal level on the left side. But on adding additional wires to the next level (Construct C), all five samples withstood fatigue testing at 300 Newton load to 3 million cycles. Wiring alternate levels instead of every level, does not compromise the stability of the construct provided the most proximal two levels are consecutively wired. This practise would minimise the risk of dural tears and cord damage during wire passage and reduce surgical time, not to mention the economical benefit.