Aims. The aim of this study was to determine the immediate post-fixation stability of a distal tibial fracture fixed with an intramedullary nail using a biomechanical model. This was used as a surrogate for immediate weight-bearing postoperatively. The goal was to help inform postoperative protocols. Methods. A biomechanical model of distal metaphyseal tibial fractures was created using a fourth-generation composite bone model. Three fracture patterns were tested: spiral, oblique, and multifragmented. Each fracture extended to within 4 cm to 5 cm of the plafond. The models were nearly-anatomically reduced and stabilized with an intramedullary nail and three distal locking screws. Cyclic loading was performed to simulate normal gait. Loading was completed in compression at 3,000 N at 1 Hz for a total of 70,000 cycles. Displacement (shortening, coronal and sagittal angulation) was measured at regular intervals. Results. The spiral and oblique fracture patterns withstood simulated weight-bearing with minimal displacement. The multifragmented model had early implant failure with breaking of the distal locking screws. The spiral fracture model shortened by a mean of 0.3 mm (SD 0.2), and developed a mean coronal angulation of 2.0° (SD 1.9°) and a mean sagittal angulation of 1.2° (SD 1.1°). On average, 88% of the shortening, 74% of the change in coronal alignment, and 75% of the change in sagittal alignment occurred in the first 2,500 cycles. No late acceleration of displacement was noted. The oblique fracture model shortened by a mean of 0.2 mm (SD 0.1) and developed a mean coronal angulation of 2.4° (SD 1.6°) and a mean sagittal angulation of 2.6° (SD 1.4°). On average, 44% of the shortening, 39% of the change in coronal alignment, and 79% of the change in sagittal alignment occurred in the first 2,500 cycles. No late acceleration of displacement was noted. Conclusion. For spiral and oblique fracture patterns, simulated weight-bearing resulted in a clinically acceptable degree of displacement. Most displacement occurred early in the test period, and the rate of displacement decreased over time. Based on this model, we offer evidence that early weight-bearing appears safe for well reduced oblique and spiral fractures, but not in multifragmented patterns that have poor bone contact. Cite this article: Bone Joint J 2021;103-B(2):294–298

The optimal method for the management of neglected traumatic bifacetal dislocation of the subaxial cervical spine has not been established. We treated four patients in whom the mean delay between injury and presentation was four months (1 to 5). There were two dislocations at the C5-6 level and one each at C4-5 and C3-4. The mean age of the patients was 48.2 years (27 to 60). Each patient presented with neck pain and restricted movement of the cervical spine. Three of the four had a myelopathy. We carried out a two-stage procedure under the same anaesthetic. First, a posterior soft-tissue release and partial facetectomy were undertaken. This allowed partial reduction of the dislocation which was then supplemented by interspinous wiring and corticocancellous graft. Next, through an anterior approach, discectomy, tricortical bone grafting and anterior cervical plating were carried out. All the patients achieved a nearly anatomical reduction and sagittal alignment. The mean follow-up was 2.6 years (1 to 4). The myelopathy settled completely in the three patients who had a pre-operative neurological deficit. There was no graft dislodgement or graft-related problems. Bony fusion occurred in all patients and a satisfactory reduction was maintained. The posteroanterior procedure for neglected traumatic bifacetal dislocation of the subaxial cervical spine is a good method of achieving sagittal alignment with less risk of iatrogenic neurological injury, a reduced operating time, decreased blood loss, and a shorter hospital stay compared with other procedures

Introduction. Correction and arthrodesis for cervical kyphosis associated with atetoid cerebral palsy has been considered to be difficult because of their involuntary neck movements and severe deformity. The aim of this study is to evaluate the surgical outcome of midline T-saw laminoplasty and posterior arthrodesis using pedicle screws. Methods. 15 patients were retrospectively reviewed. There were 6 women and 9 men, with a mean age 52.9 years (range 31–71 years). Mean follow-up period was 43 months (range 24–84 months). For clinical evaluation, the Japanese Orthopaedic Association (JOA) score and Barthel index (BI) which shows independence in ADL were used. For radiographic evaluation, change of C2–C7 Cobb angle of sagittal alignment, adjacent segment instability after the surgery were evaluated. Results. The average JOA score improved significantly from 6.2 preoperatively to 10.5 postoperatively. The average BI improved from 44.2 before surgery to 72.5 after surgery. C2–C7 Cobb angle of sagittal alignment measured 12.3 degrees of kyphosis preoperatively and 1.2 degrees of lordosis postoperatively. Solid posterior bony fusion was achieved in all cases. There was two cases of adjacent segmental instability, which required additional surgery. Seven (5.6%) out of the 125 inserted screws showed more than 2mm deviation. However, there were no neurovascular complications during or after surgery in any cases, and all cases maintained strong internal fixation. Conclusion. Midline T-saw laminoplasty and posterior arthrodesis using pedicle screw is a favorable option for the patient with kyphotic deformity associated with atetoid cerebral palsy, as it preserves cervical alignment, and improve neurological status and ADL

BACKGROUND. As life expectancy in the population rises, osteoporotic fractures are seen most frequently in the vertebral column. Percutaneous kyphoplasty is increasingly used for pain reduction and stabilization in these patients, but the efficacy, cost-effectiveness, and safety of the procedure remain uncertain. OBJECTIVE. To clarify whether kyphoplasty has additional value compared with optimum pain treatment in patients with acute vertebral fractures. MATERIALS & METHODS. From January 2004 to June 2009, 122 patients (31 males and 91 females), from 56 to 85 years old (mean age 68.5) were treated for 165 osteoporotic vertebral fractures of the thoracic or lumbar spine (minimum 15% height loss; level of fracture at Th5 or lower; bone oedema on MRI), with back pain for 6 weeks or less, and a visual analogue scale (VAS) score of 5 or more. Twelve patients (15 fractures) were lost at follow-up period and excluded. Patients were randomly allocated to percutaneous kyphoplasty (75 patients) or conservative treatment by computer-generated randomization codes. All fractures were analyzed for improvement in sagittal alignment (Cobb angle, kyphotic angle, sagittal index, vertebral height); and pain relief at 1, 6, 12, 24 months, as measured by VAS score. RESULTS. Percutaneous kyphoplasty resulted in direct and greater pain relief than did conservative treatment; difference in mean VAS score between baseline and 1 month was −6,5 after kyphoplasty and −2.4 after conservative treatment, and between baseline and 1 year was −7.2 after kyphoplasty and −3.8 after conservative treatment. No serious complications or adverse events were reported. Apart from the pain, the patient's ability to ambulate independently and without difficulty, and the need for medications improved significantly (P < 0.001) after kyphoplasty. Vertebral height significantly increased at all postoperative intervals, with 10% height increases in 88% of fractures, in kyphoplasty group at 2 years. There were no severe kyphoplasty-related complications, such as neurological defects, cement leakage or narrowing of the spinal canal whereas additional fractures occurred at the adjacent vertebrae at a rate of 10%. 35% of patients treated conservatively, had limitations in everyday activities the first 6 months, whereas additional fractures occurred at the adjacent vertebrae at a rate of 14%. CONCLUSION. In patients with acute osteoporotic vertebral compression fractures and persistent pain, balloon kyphoplasty is effective and safe. Pain relief after kyphoplasty is immediate, is sustained for at least 2 years, and is significantly greater than that achieved with conservative treatment, at an acceptable cost

BACKGROUND. Osteoporosis with subsequent osteoporotic vertebral compression fractures is an increasingly important disease due not only to its significant economic impact but also to the increasing age of our population. Pain reduction and stabilization are of primary importance with osteoporotic vertebral compression fractures. OBJECTIVE. To compare the efficacy and safety of balloon kyphoplasty and vertebroplasty for the treatment of vertebral compression fractures. MATERIALS & METHODS. From January 2004 to December 2009, 142 patients (32 males and 110 females), from 54 to 84 years old (mean age 67.4) were treated for 185 osteoporotic vertebral fractures of the thoracic or lumbar spine (level of fracture at Th5 or lower), with back pain for more than 8 weeks, and a visual analogue scale (VAS) score of 5 or more. Twenty-two patients (29 fractures) were lost at follow-up period and excluded. Patients were randomly allocated to percutaneous kyphoplasty (64%) or vertebroplasty (36%). All fractures were analyzed for improvement in sagittal alignment (Cobb angle, kyphotic angle, sagittal index, vertebral height). The patients were evaluated using the visual analog scale (VAS) and the Oswestry Disability Score. Radiographs were performed postoperatively, and at 1, 3, 6, and 12 months. RESULTS. The score according to pain, the patient's ability to ambulate independently and without difficulty, and the need for medications improved significantly (P < 0.001) after kyphoplasty or vertebroplasty. No significant difference could be found between both groups for the mean VAS and ODI preoperative and postoperative. Vertebral body height and kyphotic wedge angle of the T-L spine were also improved (p < 0.001); although kyphosis correction seems to be improved better in kyphoplasty than vertebroplasty. The rate of leakage was 12% for kyphoplasty and 32% for vertebroplasty; nevertheless most of the leakage was clinically asymptomatic and the rate of serious problems remained low (pulmonary embolism 0.01% kyphoplasty vs 0.6% vertebroplasty). New fractures in the next 6 months at the adjacent vertebrae were observed ∼ 15% in both groups. More PMMA was used in the kyphoplasty group than in the vertebroplasty group (5.5 +/− 0.8 vs. 4.1 +/− 0.5 mL, p < 0.001). Operation time was longer in balloon kyphoplasty compared to vertebroplasty (mean time 20±5min/vertebral fracture in group B vs 30±5min in group A). CONCLUSION. Both balloon kyphoplasty and vertebroplasty provided a safe and effective treatment for pain and disability in patients with vertebral compression fractures due to trauma or osteoporosis. Balloon kyphoplasty led to an ongoing reduction of fractured vertebrae and was followed by a lower rate of cement leakage

Aims

Postoperative malalignment of the femur is one of the main complications in distal femur fractures. Few papers have investigated the impact of intraoperative malalignment on postoperative function and bone healing outcomes. The aim of this study was to investigate how intraoperative fracture malalignment affects postoperative bone healing and functional outcomes.

Background. The optimal treatment of segmental tibial fractures (STF) is controversial. Intramedullary nailing (IMN) and external fixation (EF) have unique benefits and complications. Aim. To compare outcomes for AO/OTA 42C2 and 42C3 fractures treated using IMN with those treated using EF in a University Teaching Hospital. Methods. Retrospective case note and radiograph review of 31 segmental tibial fractures treated between 2010 and 2017. Results. There were 17 42C2 and 14 42C3 fractures. 17 patients underwent IMN and 14 EF, and were matched for age and gender. 9 fractures in each group were open. Median time to radiological union was 7 months for IMN and 8 months for EF. Revision surgery was needed for 4 IMN patients and 3 EF patients. The mean number of unplanned procedures was 1.46 for IMN and 1.1 for EF (p=0.69). Length of stay was 15.5 days for IMN and 16.2 days for EF (p=0.9). There was one compartment syndrome in each group and 2 cases of deep infection in the IMN group. There was no significant difference in coronal and sagittal plane alignment. Conclusions. Notwithstanding the small numbers and the retrospective design, the results show that the results of IMN may be equivalent to EF. Modern techniques using suprapatellar entry and blocking screws, combined with early plastic surgical coverage in open injuries are likely to have improved outcomes. Implications. Modern IM nailing techniques have produced similar clinical and radiological outcomes to that achieved by external fixation in this series

Electromagnetic navigation versus conventional Total Knee Arthroplasty: Clinical improvements Optical and electromagnetic (EM) tracking systems are widely used commercially. However in orthopaedic applications optical systems dominate the market. Optical systems suffer from deficiencies due to line of sight. EM trackers are smaller but are affected by metal. The accuracy of the two tracker systems has been seen to be comparable1. Recent advancements in optical navigated TKA have shown improved overall limb alignment, implant placement and reduce outliers when compared to conventional TKA2-4. This study is the first RCT to compare EM and conventional TKA. Two groups of 100 patients underwent TKA using either the EM navigation system or the conventional method. Frontal, sagittal and rotational alignment was analysed from a CT scan. Clinical scores including Oxford Knee Score (OKS) and Knee/Function American Knee Society Score (AKSS) were recorded pre-op, and at 3 and 12 months post-op. 3 month data presented includes 180 patients (n = 90). The 12 months data presented includes 140 (n = 70). The two groups had similar mean mechanical axis alignments (EM 0.31o valgus, conventional 0.15o valgus). The mechanical axis alignment was improved in the EM group with 92% within +/-3o of neutral compared to 84% of the conventional group (p = 0.90). The alignment of the EM group was improved in terms of frontal femoral, frontal tibial, sagittal femoral, sagittal tibial and tibial rotation alignment. However, only the sagittal femoral alignment was significantly improved in the EM group (p = 0.04). Clinically, both TKA groups showed significant improvements in OKS and AKSS scores between both pre-op to 3 month post-op and 3 months to 12 months post-op (p<0.001). The OKS and the AKSS knee score for the EM group was significantly better at 3 months post-op (OXS p = 0.02, AKSS knee p = 0.04). However there was no difference between the groups at 12 months. The mean pre-op range of motion (ROM) for both groups was 105o. This decreased to 102o in the EM group and 99o in the conventional group at 3 months. There was a significant improvement at 12 months post-op, EM = 113o (p = 0.012) and conventional = 112o (p = 0.026). There was no significant difference in ROM between the two groups at 3 or 12 months post-op. Therefore the alignment outcome of the EM TKA group was improved compared to the conventional group. The EM group also showed clinical improvements at 3 months post-op however these were not seen again at 12 months post-op. ROM was seen to decrease at 3 months post-op but then significantly improve by 12 month post-op

Intramedullary tibial nailing was performed in ten paired cadavers and the insertion of a medial-to-lateral proximal oblique locking screw was simulated in each specimen. Anatomical dissection was undertaken to determine the relationship of the common peroneal nerve to the cross-screw.

The common peroneal nerve was contacted directly in four tibiae and the cross-screw was a mean of 2.6 mm (1.0 to 10.7) away from the nerve in the remaining 16. Iatrogenic injury to the common peroneal nerve by medial-to-lateral proximal oblique locking screws is therefore a significant risk during tibial nailing.

Between 1996 and 2003 six institutions in the United States and France contributed a consecutive series of 234 fractures of the femur in 229 children which were treated by titanium elastic nailing. Minor or major complications occurred in 80 fractures. Full information was available concerning 230 fractures, of which the outcome was excellent in 150 (65%), satisfactory in 57 (25%), and poor in 23 (10%). Poor outcomes were due to leg-length discrepancy in five fractures, unacceptable angulation in 17, and failure of fixation in one. There was a statistically significant relationship (p = 0.003) between age and outcome, and the odds ratio for poor outcome was 3.86 for children aged 11 years and older compared with those below this age. The difference between the weight of children with a poor outcome and those with an excellent or satisfactory outcome was statistically significant (54 kg vs 39 kg; p = 0.003). A poor outcome was five times more likely in children who weighed more than 49 kg.

In a series of 126 consecutive pilon fractures, we have described anatomically explicable fragments. Fracture lines describing these fragments have revealed ten types of pilon fracture which belong to two families, sagittal and coronal. The type of fracture is dictated by the energy of injury, the direction of the force of injury and the age of the patient.