COVID-19: a catalyst for the digitization of surgical teaching at a German University Hospital.

BACKGROUND: The summer semester 2020, had to be restructured due to the SARS-CoV-2 pandemic and the associated contact restrictions. Here, for the first time, the established lectures in lecture halls and small group seminars could not be conducted in presence as usual. A possible tool for the implementation of medical teaching, offers the use of eLearning, online webinars and learning platforms. At present it is unclear how the SARS-CoV-2 pandemic will affect surgical teaching, how digitization will be accepted by students, and how virtual teaching can be expanded in the future. METHODS: The teaching, which was previously delivered purely through face-to-face lectures, was completely converted to digital media. For this purpose, all lectures were recorded and were available to students on demand. The seminars were held as a twice a week occurring online webinar. The block internship was also conducted as a daily online webinar and concluded with an online exam at the end. At the end of the semester, a survey of the students was carried out, which was answered by n = 192 students with an anonymized questionnaire. The questionnaire inquires about the previous and current experience with eLearning, as well as the possibility of a further development towards a purely digital university. RESULTS: There were n = 192 students in the study population. For 88%, the conversion of classes to web-based lectures represented their first eLearning experience. For 77% of all students, the digitization of teaching led to a change in the way they prepare for class. 73% of the participating students are of the opinion that eLearning lectures should continue to be offered. 54% of the students felt that eLearning lectures made more sense than face-to-face lectures. A purely virtual university could be imagined by 41% of the students. CONCLUSION: The conversion of teaching represented the first contact with eLearning for most students. Overall, the eLearning offering was experienced as positive. Due to the new teaching structure, the way of learning had already changed during the semester. Based on the new eLearning content, the already existing formats can be further expanded in the future. Nevertheless, it turned out that the practical-surgical contents and skills cannot be adequately represented by purely online offers; for this, the development of hybrid practice-oriented teaching concepts is necessary.

[Case-based learning can improve the teaching quality in trauma surgery education : A survey analysis among medical students]. / Fallbasiertes Lernen kann die Lehrqualität im unfallchirurgischen Unterricht verbessern : Eine Umfrageanalyse unter Medizinstudierenden.

BACKGROUND: Medical education has always been challenging for students and teachers. Of growing importance is the promotion of knowledge of correlations and knowledge transfer from theoretical aspects into clinical practice. In order to achieve this aim, student-centered teaching concepts are increasingly being employed in the literature. OBJECTIVE: Can a trauma surgery practical seminar be improved by a case-based teaching concept? MATERIAL AND METHODS: For this purpose, standardized case studies and corresponding teaching materials, such as classification aids and treatment strategies, were made available to the students and lecturers. Using a two-staged evaluation the effects of the modified teaching design could be recorded and statistically analyzed. RESULTS: The seminar was considered to be relevant for the examinations. The teaching by the lecturers was found to be more competent and appeared more motivated. Overall, the seminar was rated better by the students. CONCLUSION: A case-based teaching concept can significantly improve the education in trauma surgery, when correctly and specifically implemented.

Medial Patellofemoral Ligament Reconstruction: Impact of Knee Flexion Angle During Graft Fixation on Dynamic Patellofemoral Contact Pressure-A Biomechanical Study.

PURPOSE: Objective evaluation of the optimal graft tension angle to fully restore patellofemoral contact pressure in reconstruction of the medial patellofemoral ligament (MPFL) in comparison to the native knee. METHODS: Twelve cadaveric knee specimens were fixed in a custom-made fixation device. A sensitive pressure film (Tekscan) was fixed in the patellofemoral joint, and patellofemoral contact pressure was assessed during a dynamic flexion movement from 0° to 90°. The MPFL was cut and measurements were repeated. Reconstruction of the MPFL was performed with the gracilis tendon subsequently fixed in the femur at 15°, 30°, 45°, 60°, 75°, and 90° of knee flexion under controlled tension (2 N). The sequence of the flexion angles was alternated. Pressure measurements were repeated after every fixation of the graft. RESULTS: No significant differences were seen in the overall patellofemoral contact pressure compared to the native knee (P > .05). However, medial patellofemoral pressure showed a significant increased patellofemoral contact pressure after MPFL reconstruction at a knee flexion angle during graft fixation of 15° (P = .027), 45° (P = .050, P = .044), and 75° (P = .039). Moreover, proximal/distal patellofemoral contact pressure revealed a significantly reduced contact pressure at 15° (P = .003), 30° (P = .009), 45° (P = .025), 75° (P = .021), and 90° (P = .022) of flexion distal after MPFL reconstruction compared with the intact knee. Lateral patellofemoral contact pressure was significantly reduced in all performed reconstructions (P < .05). CONCLUSIONS: The flexion angle during graft fixation for MPFL reconstruction did not have a significant impact on the overall patellofemoral contact pressure. However, selective medial, proximal, distal, and lateral patellofemoral contact pressure was significantly altered for all reconstructions. Fixation of the MPFL graft at 60° of flexion was able to most closely restore patellofemoral contact pressure compared with the intact knee. CLINICAL RELEVANCE: Based on the findings of the present study, fixation of the graft in anatomic reconstruction of the MPFL should be considered in 60° of flexion under low tension (2 N) to most closely restore patellofemoral contact pressure compared with the native knee.

Biomechanical evaluation of MPFL reconstructions: differences in dynamic contact pressure between gracilis and fascia lata graft.

PURPOSE: To evaluate the knee kinematics of the intact, MPFL-ruptured and MPFL-reconstructed knee and, moreover, to compare dynamic patellofemoral contact pressure of the gracilis tendon and the fascia lata as an alternative graft option for reconstruction of the MPFL. METHODS: Eight paired human cadaveric knees were fixed in a custom-made fixation device. Patellofemoral contact pressure was assessed during a dynamic flexion movement at 15°-30°-45°-60°-75° and 90° using a pressure-sensitive film (Tekscan). The medial patellofemoral ligament was cut, and measurements were repeated. Finally, reconstruction of the MPFL was performed using the gracilis tendon (group I) or a fascia lata graft (group II). Tunnel localization was performed under fluoroscopic control. Grafts were fixed at 30° of flexion, and pressure measurements were repeated. RESULTS: Incision of the medial patellofemoral ligament significantly reduced patellofemoral contact pressure at 15°, 30° and 45° of knee flexion compared to the intact knee (p < 0.05), whereas reconstruction of the MPFL using either gracilis tendon of the fascia lata was able to restore pressure distributions at 15° and 30° of knee flexion. However, in the hamstring group, reconstruction of the MPFL revealed a significantly reduced contact pressure at 45° of flexion (p = 0.038) compared to the intact knee. In the fascia lata group, a significant reduction in patellofemoral contact pressure was observed after MPFL reconstruction at 45°, 60°, 75° and 90° of knee flexion (p < 0.05). CONCLUSIONS: Anatomic reconstruction of the MPFL with either a gracilis or a fascia lata graft showed comparable patellofemoral pressure distributions which were closely restored compared to the native knee. Therefore, the fascia lata has shown to be a viable alternative to the gracilis tendon for reconstruction of the MPFL. However, anatomic reconstruction of the MPFL may lead to persistently altered patellofemoral contact pressure during knee flexion compared to the native knee independent of the tested graft.

Treatment for displaced proximal humerus fractures: comparison of interlocking plate fixation versus minimal invasive techniques.

BACKGROUND AND PURPOSE: The functional results and the complications following interlocking plate fixation of displaced proximal humerus fractures should be evaluated and compared with those following minimal invasive fixation techniques. PATIENTS AND METHODS: Fifty patients (30 women, 20 men, mean age 62.7 (18-91) years) were treated for a displaced proximal humerus fracture using an interlocking plate fixation (PHILOS®) between 2003 and 2004. The mean follow-up time was 12 (9-36) months. Functional and radiographic results (Constant-Murley and Neer scores) were analyzed and compared with an equivalent historical control group of 53 patients operated for the same fracture types using minimal invasive techniques (K-wires and/or cannulated screws) between 1995 and 1997. According to the OTA/AO classification, there were 15 type A, 18 type B, and 17 type C fractures in the plate fixation group, and 23, 25, and 5 of these types in the control group, respectively. RESULTS: The mean Neer score was 85.9, the mean Constant-Murley score 84, whereas 82.4 and 75.4 for the control group, respectively. Good and excellent results were seen in 78%, whereas in 70% in the control group. The results were dependent upon the fracture's type, sex, and patient's age. Complications were seen in 9 patients, whereas in 16 patients in the control group. INTERPRETATION: Using an interlocking plate, the indication of fixation of displaced proximal humerus fractures had been expanded to type C fractures. The implant failure rate can be reduced. The functional results achieved are better compared with those following minimal invasive techniques.

What are predictors for patients' quality of life after pelvic ring fractures?

BACKGROUND: Data from literature on predictors for patients' quality of life after pelvic ring fractures are conflicting and based on small study populations. QUESTIONS/PURPOSES: We therefore evaluated predictors for health-related quality of life in patients with pelvic ring injuries at a minimum of 1 year postfracture. METHODS: We surveyed 172 patients of the German Pelvic Trauma Registry admitted to four medical centers between February 3, 2004, and May 11, 2011. The median age of the followup cohort was 47 years (range, 8-88 years); 69 of 172 (40%) patients were female. Patients were characterized by a median Injury Severity Score of 17. There were 31 Tile Type A fractures (18%), 77 Type B fractures (45%), and 64 Type C fractures (37%). The incidence of complex fractures and multiple traumas was 34 of 172 (20%) and 116 of 172 (67%), respectively. One hundred twenty-five (73%) patients were treated operatively. We obtained the EQ-5D™ score to assess patients' health-related quality of life. For the analysis of predictors for quality of life, a multivariate linear regression model was built. The median followup was 3 years (range, 1-6 years). RESULTS: The median EQ-5D™ score was 0.78 (interquartile limits, 0.63 and 1.00). Age, complex trauma, and surgery independently predicted the EQ-5D™ score. CONCLUSIONS: We conclude patients with higher age, complex trauma, and surgery had a higher likelihood for a reduced quality of life after pelvic ring injuries.

Compression and contact area of anterior strut grafts in spinal instrumentation: a biomechanical study.

BACKGROUND: Anterior bone grafts are used as struts to reconstruct the anterior column of the spine in kyphosis or following injury. An incomplete fusion can lead to later correction losses and compromise further healing. Despite the different stabilizing techniques that have evolved, from posterior or anterior fixating implants to combined anterior/posterior instrumentation, graft pseudarthrosis rates remain an important concern. Furthermore, the need for additional anterior implant fixation is still controversial. In this bench-top study, we focused on the graft-bone interface under various conditions, using two simulated spinal injury models and common surgical fixation techniques to investigate the effect of implant-mediated compression and contact on the anterior graft. METHODS: Calf spines were stabilised with posterior internal fixators. The wooden blocks as substitutes for strut grafts were impacted using a "pressfit" technique and pressure-sensitive films placed at the interface between the vertebral bone and the graft to record the compression force and the contact area with various stabilization techniques. Compression was achieved either with posterior internal fixator alone or with an additional anterior implant. The importance of concomitant ligament damage was also considered using two simulated injury models: pure compression Magerl/AO fracture type A or rotation/translation fracture type C models. RESULTS: In type A injury models, 1 mm-oversized grafts for impaction grafting provided good compression and fair contact areas that were both markedly increased by the use of additional compressing anterior rods or by shortening the posterior fixator construct. Anterior instrumentation by itself had similar effects. For type C injuries, dramatic differences were observed between the techniques, as there was a net decrease in compression and an inadequate contact on the graft occurred in this model. Under these circumstances, both compression and the contact area on graft could only be maintained at high levels with the use of additional anterior rods. CONCLUSIONS: Under experimental conditions, we observed that ligamentous injury following type C fracture has a negative influence on the compression and contact area of anterior interbody bone grafts when only an internal fixator is used for stabilization. Because of the loss of tension banding effects in type C injuries, an additional anterior compressing implant can be beneficial to restore both compression to and contact on the strut graft.

Osteitis pubis and adductor tendinopathy in athletes: a novel arthroscopic pubic symphysis curettage and adductor reattachment.

INTRODUCTION: Various surgical treatment options have been described in athletes with degenerative osteitis pubis who fail to respond to conservative treatment modalities. Although adductor longus tendinopathy often represents an additional pain generator in chronic groin pain associated with osteitis pubis, this has not been acknowledged in the surgical literature, to our knowledge. We present the results of a novel surgical technique for combined degenerative lesions of the pubic symphysis joint and the adjacent adductor longus tendon in a series of athletes with osteitis pubis. METHODS: During 2009 and 2010, five competitive non-professional soccer players with considerable groin and pubic pain were referred to our clinic, after conservative therapy over a period of at least 12 months had failed. According to our clinical protocol for patients with groin pain, physical examination, pelvic radiographs and arthrography of the pubic symphysis to detect microlesions of the adjacent adductor longus tendons were performed. The patients diagnosed with degenerative osteitis pubis and concomitant lesion of the adductor longus origin were indicated for surgery. Surgery consisted of resection of the degenerative soft and bone tissue and subsequent reattachment with suture anchors. With regard to stability of the symphysis pubis, a two-portal arthroscopic curettage of the degenerative fibrocartilaginous disc tissue was performed. The patients were followed prospectively at medium term with assessment of general pain level (VAS score) and sport activity with pain (NIPPS score) pre- and postoperatively. RESULTS: All patients recovered to full activity sports after an average period of 14.4 weeks. VAS and NIPPS scores markedly improved and overall satisfaction with the postoperative result was high. One intraoperative bleeding occurred, needing revision surgery. None of the patients developed pubic instability due to pubic symphysis curettage in the sequel. CONCLUSIONS: This novel surgical technique combines successfully stability-preserving arthroscopic pubic symphysis curettage with adductor debridement and reattachment in well-selected cases of athletes suffering from degenerative osteitis pubis and concomitant adductor pathology, being refractory to conservative treatment. Diligent preoperative evaluation of the specific pathology will lead to successful outcome.

Experiences in the Use of Motorized Intramedullary Nails after Complex Injuries to the Extremities. / Erfahrungen bei der Anwendung motorisierter Marknägel nach komplexen Extremitätenverletzungen.

The treatment of complex injuries of the extremities after comminuted fractures or non-unions is a challenging area in the field of trauma surgery. Internal, motorized implants nowadays enable a patient-oriented and progressive treatment of these cases. The present article aims to present modern treatment strategies of complex injuries of the extremities, support the use of novel, motorized intramedullary nails and provide experiences for the handling with lengthening nails or transport nails. For this purpose, the preoperative planning including selection of patients, presentation of internal lengthening and transport systems and the most important factors during preparation of the surgery are described. Moreover, critical steps during the implantation of motorized nails and also during potential follow-up interventions are highlighted and the postoperative protocol including precise recommendations for the transport und consolidation phase are provided. Finally, the experiences are illustrated by presentation of the four different cases. The use of internal, motorized implants represents the latest step in the treatment of complex injuries of the extremities. These implants improve the quality of life and the authors recommend its use. However, these implants require a high expertise and adaption of established treatment protocols in these challenging trauma cases. Follow-up analyses with a considerably large number of cases are necessary and the research on implants to solve persisting problems in the area of complex injuries of the extremities has to be pursued intensively.

A novel minimally invasive and press-fit method for symphysiodesis - a biomechanical analysis.

PURPOSE: Does the cylindrical shaped bone block allow a stable construct for the arthrodesis of the pubic symphysis compared to a rectangular shaped bone block. The cylindrical shaped bone block stabilized by a 3.5 symphyseal plate is inferior to the stabilization with an internal fixator. METHODS: This study analyzed the arthrodesis of the pubic symphysis on 24 synthetic pelvises, using a rectangular shaped bone block (control group) or a cylindrical shaped bone block, stabilized with a symphysis locking plate (n = 8) as the standard clinical procedure. Additionally we analyzed the stability using an internal fixator. RESULTS: This study showed that utilizing a cylindrical shaped synthetic bone graft results in a significant higher contact area and compression force compared to the classical rectangular shaped graft. Furthermore, the stabilization with an internal fixator had the tendency for increases of compression force and contact area, yet without a statistical significance, when compared to the plate fixation. CONCLUSION: The novel method of cylindrical symphysis resection and cylindrical bone block implantation allowed an increased biomechanical stability compared to using a classical rectangular bone graft, also resulting in higher contact area. Moreover, this technique would also allow a minimally invasive approach for this purpose, which in turn could preserve perisymphyseal ligaments, thereby improving healing in a clinical context.

Acute management and outcome of multiple trauma patients with pelvic disruptions.

INTRODUCTION: Data on prehospital and trauma-room fluid management of multiple trauma patients with pelvic disruptions are rarely reported. Present trauma algorithms recommend early hemorrhage control and massive fluid resuscitation. By matching the German Pelvic Injury Register (PIR) with the TraumaRegister DGU (TR) for the first time, we attempt to assess the initial fluid management for different Tile/OTA types of pelvic-ring fractures. Special attention was given to the patient's posttraumatic course, particularly intensive care unit (ICU) data and patient outcome. METHODS: A specific match code was applied to identify certain patients with pelvic disruptions from both PIR and TR anonymous trauma databases, admitted between 2004 and 2009. From the resulting intersection set, a retrospective analysis was done of prehospital and trauma-room data, length of ICU stay, days of ventilation, incidence of multiple organ dysfunction syndrome (MODS), sepsis, and mortality. RESULTS: In total, 402 patients were identified. Mean ISS was 25.9 points, and the mean of patients with ISS ≥ 16 was 85.6%. The fracture distribution was as follows: 19.7% type A, 29.4% type B, 36.6% type C, and 14.3% isolated acetabular and/or sacrum fractures. The type B/C, compared with type A fractures, were related to constantly worse vital signs that necessitated a higher volume of fluid and blood administration in the prehospital and/or the trauma-room setting. This group of B/C fractures were also related to a significantly higher presence of concomitant injuries and related to increased ISS. This was related to increased ventilation and ICU stay, increased rate of MODS, sepsis, and increased rate of mortality, at least for the type C fractures. Approximately 80% of the dead had sustained type B/C fractures. CONCLUSIONS: The present study confirms the actuality of traditional trauma algorithms with initial massive fluid resuscitation in the recent therapy of multiple trauma patients with pelvic disruptions. Low-volume resuscitation seems not yet to be accepted in practice in managing this special patient entity. Mechanically unstable pelvic-ring fractures type B/C (according to the Tile/OTA classification) form a distinct entity that must be considered notably in future trauma algorithms.

A novel press-fit minimally-invasive symphysiodesis technique.

OBJECTIVE: Instability of the pubic symphysis often results in a poor outcome and reduced mobility of the patient. In some cases, an arthrodesis of the pubic symphysis is required. Until today, there is no data published how many of these procedures are performed annually and there is also no data about the outcome after this extensive surgery. METHODS: We developed a novel surgical technique to address the arthrodesis of the pubic symphysis in a minimally invasive approach. Therefore, we used for this purpose modified instruments and performed the transplantation of a cylindrical bone substitute into the pubic symphysis, without an extensive approach or dissecting the anterior or posterior symphyseal ligaments. RESULTS: Using this novel technique, a minimally invasive symphysiodesis was achieved in radiological findings, after the procedure. CONCLUSION: Thus, this actually minimally invasive surgical technique seems to be a promising advancement for the arthrodesis of the pubic symphysis.

A novel internal fixation method for open book injuries of the pubic symphysis- A biomechanical analysis.

BACKGROUND: Pelvic fractures in adults are common injuries and account for up to 3.64% of all fractures. Usually, the treatment of open book injuries (Types B1.1 and B1.2 AO-Classification) is open reduction and plate stabilization using dynamic compression plates, with or without interlocking screws. These implants seem to enhance the outcome of such injuries, but also variety of complications occurs. To reduce complications and achieve appropriate reduction and stabilization, this study compared established stabilization techniques to a novel minimally invasive internal fixation method using an internal fixator system that is already being utilized for spinal fractures. METHODS: This study was performed on 32 composite pelvises in a bilateral stance biomechanical model. The pelvises were variously stabilized with an internal fixator, a 4.5 mm dynamic compression plate and a 3.5 mm symphyseal locking dynamic compression plate. The contact area and loading forces were assessed by a sensor film inside the symphyseal gap. FINDINGS: This study showed significantly greater reduction and loading capabilities of the internal fixator compared to the other implants (p < 0.05). There was also significantly greater contact area with the use of an internal fixator compared to the other implants (p < 0.05). The 3.5 mm interlocking plate showed significantly greater contact area compared to the 4.5 mm plate (p < 0.05). INTERPRETATION: The internal fixator that is already proven in spinal surgery is biomechanically superior to conventional implants used in pelvic surgery. The contact area analysis furthermore showed a more physiological loading pattern, which can improve ligamentous healing in a clinical context.

Anterior approaches to the acetabulum: which one to choose?

Surgical treatment of acetabular fractures remains challenging even for experienced surgeons.Whilst the ilioinguinal and the Kocher-Langenbeck approach remain the standard procedures to expose the anterior or posterior aspects of the acetabulum, some modified anterior approaches for the stabilization of the acetabulum have been introduced.This article will provide an overview of approaches to the anterior aspect of the acetabulum and explain the efforts that have been made to improve the surgeon's options for certain fracture modifications, such as fractures with separation of the quadrilateral surface. Cite this article: EFORT Open Rev 2020;5:707-712. DOI: 10.1302/2058-5241.5.190061.

Stabilization of a Type B1.1 Injury in a Morbidly Obese Patient Using an Internal Fixator in a Minimally Invasive Technique: A Case Report.

CASE: In this case report, we present a novel stabilization technique of the pubic symphysis using an internal spinal fixator in a 78-year-old morbidly obese woman having a pelvic disruption type B1.1 (AO classification). We treated the disruption using an internal fixator to reduce the extent of the incision and soft-tissue damage. CONCLUSIONS: The use of an internal fixator, known from percutaneous spinal fixation, for the stabilization of the pubic symphysis in cases of disruption ("open book" injuries) may be an alternative to the standard plate fixation as a novel minimally invasive stabilization technique.

Pelvic fracture in multiple trauma: are we still up-to-date with massive fluid resuscitation?

Until today the mortality of complex pelvic trauma remains unacceptably high. On the one hand this could be attributed to a biological limit of the survivable trauma load, on the other hand side an ongoing inadequate treatment might be conceivable too. For the management of multiple trauma patients with life-threatening pelvic fractures, there is ongoing international debate on the adequate therapeutic strategy, e.g. arterial embolization or pelvic packing, as well as aggressive or restrained volume therapy. Whereas traditional pelvis-specific trauma algorithms still recommend massive fluid resuscitation, there is upcoming evidence that a restrained volume therapy in the preclinical setting may improve trauma outcomes. Less intravenous fluid administration may also reduce haemodilution and concomitant trauma-associated coagulopathy. After linking the data of the TraumaRegister DGU(®) and the German Pelvic Injury Register, for the first time, the initial fluid management for complex pelvic traumas as well as for different Tile/OTA types of pelvic ring fractures could be addressed. Unfortunately, the results could not answer the question of the adequate fluid resuscitation but confirmed the actuality of massive fluid resuscitation in the prehospital and emergency room setting. Low-volume resuscitation seems not yet accepted in practice in managing multiple trauma patients with pelvic fractures at least in Germany. Nevertheless, prevention of exsanguination and of complications like multiple organ dysfunction syndrome still poses a major challenge in the management of complex pelvic ring injuries. Even nowadays, fluid management for trauma, not only for pelvic fractures, remains a controversial area and further research is mandatory.

Reduction and fixation capabilities of different plate designs for pubic symphysis disruption: a biomechanical comparison.

BACKGROUND: Typical stabilisation of pelvic open book injuries consists in plate fixation of the symphysis, leading to many different plate designs and procedures that have evolved. However, implant loosening and development of chronic instability are still evident and represent major complications after plate fixation of the symphysis. The aim of this study was to analyse reduction and fixation capabilities of different classical plate techniques with dynamic compression (DC), prebending or modern interlocking screws. METHODS: Compression injuries (OTA B1.1) were simulated on synthetic composite pelvises. Sensor films placed in the disrupted symphysis allowed assessment of reduction and compression forces, as well as contact characteristics by implants at defined time points under static non loaded conditions. The commercially available steel plates used in our study differed in curved design, prebending and DC- or locking screw capabilities, as narrow large fragment (4.5) or small fragment plates (3.5). RESULTS: DC procedure clearly increased the compressive force in the symphysis and improved the reduction by enhanced contact areas. These effects were preserved to the end of the experiments only when the plates were prebended (10°). Anatomically contoured and prebended 3.5 plates had a similar effect, but the contact area was even more pronounced. Best results were observed using the "3.5 symphyseal plate" with DC-effect medially and locking screws laterally. Purely interlocking screw plates by themselves allowed an optimal contact area, yet failed to preserve the initial compressive reduction force. CONCLUSIONS: The experimental results suggest a biomechanical advantage in using prebended plates for symphysis fixation compared to non-bended plates. Best results with regard to compression and increased contact area can be achieved by anatomically contoured plates with combined DC and locking screw capabilities. These findings are of special interest in pelvic surgery for choosing the right implant in severe displacements, obese patients and symphysiodesis techniques.

Balloon tibioplasty: a useful tool for reduction of tibial plateau depression fractures.

Reduction of the articular surface in displaced tibial plateau fractures is still challenging and may result in joint incongruence, leading to posttraumatic arthrosis. Conventional techniques use bone tamps and similar instruments, which can increase the surgical trauma due to their size. "Balloon tibioplasty" is a novel minimally invasive technique for the reduction of depressed tibial plateau fractures. We successfully applied an inflatable balloon, commercially available from kyphoplasty, to elevate the depressed articular fragments. This technique allowed for reduction of the depressed tibial plateau fragment without classic fenestration of the tibia, thereby minimizing surgical trauma. Furthermore, under fluoroscopic control, optimal centering of the expanding tibioplasty balloon allows a widespread and continuously increasing reduction force to the fracture area. After fluoroscopy or arthroscopic confirmation of reduction of the articular surface, the cavity resulting from tibioplasty was filled with ceramic bone cement through small incisions and fractures were fixed with a small fragment locking T-plate (3.5 mm). Balloon tibioplasty was applied in 5 patients with displaced tibial plateau fractures (OTA type B2/3). No intra- or postoperative complications were observed. This new technique may be a useful tool to facilitate the reduction of select depressed tibial fractures in the future.

Atypical extensive extratemporal hyperpneumatization of the skull base including the cervical spine: case report and review of the literature.

STUDY DESIGN: Case report and clinical discussion. OBJECTIVE: To describe a rare case of hyperpneumatization of the skull base including the cervical spine with the atlas bone. SUMMARY OF BACKGROUND DATA: Initial imaging studies of physically traumatized patients consist of conventional radiographs. An atypical radiolucency is often misdiagnosed as a primary malignancy or a secondary osteolytic metastasis. Further imaging studies may reveal an underlying atypical hyperpneumatization as a very rare benign differential diagnosis. Pathophysiologically, embryological developmental anomalies as well as an elevated pressure to the middle and inner ear are discussed. METHODS: We present a symptomatic 40-year-old man with conventional radiographs, after computed tomography and magnetic resonance imaging examinations. RESULTS: Imaging studies reveal an uncommon radiolucency of the skull base including the atlas bone, free air beneath the mastoid bone, stylomastoid foramen, epidural air adjacent to the atlas bone, and surrounding soft-tissue emphysema. CONCLUSION: Atypical radiolucency may represent a very rare benign hyperpneumatization of the skull base, which may include the craniocervical junction. Because of microfractures of the thinned and consecutive, less stable bones, this also can lead to free air and soft-tissue emphysema, which has not been described previously. Special care should be taken to identify epidural free air because of a possible communication of the epidural space with the external environment. Harmful activities and especially high-speed trauma could result in fractures of the cervical spine due to decreased stability of the hyperpneumatized bones.