Axial computed tomography of pilon fractures

Diagnostic accuracy of fat pad sign, X-ray, and computed tomography in elbow trauma: implications for treatment choices-a retrospective study

Introduction

Identifying skeletal injuries significantly impacts patient outcomes in trauma cases. This study aims to compare the diagnostic accuracy of X-ray (XR) and computed tomography (CT) in detecting elbow fractures among patients presenting at the emergency department (ED). Additionally, the study assesses the potential contribution of the fat pad sign to enhancing the diagnostic accuracy of XR images in identifying elbow fractures. The secondary aim focused on evaluating the precision of XR imaging in determining the necessity for surgical intervention among patients presenting with elbow trauma.

Methods

Conducted retrospectively at an ED within a secondary hospital, this study included patients with elbow trauma between January 1, 2017, and January 1, 2020, who underwent both XR and CT imaging of the elbow joint. Following the application of exclusion criteria, the analysis comprised 183 patients based on remaining image data.

Results

When comparing XR to CT for fracture detection, XR exhibited a sensitivity of 46.9%, specificity of 85.9%, positive predictive value (PPV) of 79.3%, negative predictive value (NPV) of 58.4%, area under the curve (AUC) of 0.664. Considering the fat pad sign in XR as a fracture indicator, the sensitivity is 60.2%, specificity is 81.2%, PPV is 78.7%, NPV is 63.9% and AUC is 0.707. A significant difference was found when comparing the AUCs obtained with and without considering the fat pad sign (p = 0.039). Regarding surgical treatment decision-making, XR showed a sensitivity of 50%, specificity of 100%, PPV of 95%, NPV of 100%, and an AUC of 0.750 when compared to CT.

Conclusion

The findings indicate that XR alone is insufficient for detecting elbow fractures and determining the need for surgical treatment. Incorporating the fat pad sign improves the diagnostic accuracy of XR. In cases where suspicion of fracture is high, considering CT imaging is crucial to avoid missed diagnoses, prevent complications, and guide treatment decisions effectively.

Management of High-Energy Tibial Pilon Fractures

➤ Pilon fractures in the younger patient population are frequently high-energy, intra-articular injuries and are associated with devastating, long-term impacts on patient-reported outcomes and health-related quality of life, as well as high rates of persistent disability.➤ Judicious management of associated soft-tissue injury, including open fractures, is essential to minimizing complications. Optimizing medical comorbidities and negative social behaviors (e.g., smoking) should be addressed perioperatively.➤ Delayed internal fixation with interval temporizing external fixation represents the preferred technique for managing most high-energy pilon fractures presenting with characteristically substantial soft-tissue trauma. In some cases, surgeons elect to utilize circular fixation for these scenarios.➤ Although there have been treatment advances, the results have been generally poor, with high rates of posttraumatic arthritis, despite expert care.➤ Primary arthrodesis may be indicated in cases with severe articular cartilage injury that, in the opinion of the treating surgeon, is likely unsalvageable at the time of the index management.➤ The addition of intrawound vancomycin powder at the time of definitive fixation represents a low-cost prophylactic measure that appears to be effective in reducing gram-positive deep surgical site infections.

Differences in Pilon Fractures According to Ipsilateral Fibular Injury Patterns: A Clinical Computed Tomography-Based Mapping Study

Background

Preoperative verification of fracture morphology is essential for determining the definitive fixation strategy in the management of a pilon fracture. This study aimed to determine the correlation between fibular injury patterns and fracture morphologies and introduce clinical implications.

Methods

Computed tomography scans of 96 pilon fractures were retrospectively analyzed and divided into three types: intact fibula, simple fracture, and multifragment fracture. The principal fracture line and comminution zones were illustrated on a plafond template and diagrammatized on a 6 × 6 grid using PowerPoint software as fracture mapping. Correlations between fibular injury patterns and fracture morphologies, including comminution zones and principal fracture lines, were analyzed.

Results

The thickest comminution zone was most often located in the anterolateral quadrant. According to fibular injury patterns, the comminution zone of the multifragment group was placed two grids more lateral than that of other groups. Lateral exits of the principal fracture line in the multifragment group were much more concentrated within the fibular incisura.

Conclusions

In pilon fractures, a more complex fibular fracture pattern was related to the valgus position. Moreover, the articular fracture pattern of pilon fractures differed according to coronal angulation and fibular fracture pattern. These differences should influence the operative approach and placement of the plate.

Pilon fractures: Consensus and controversy

Pilon fractures are complex injuries that require an individualized approach to treatment to avoid complications and achieve good outcomes. Staged open reduction internal fixation remains the gold standard for most cases to achieve anatomic articular reduction while minimizing soft tissue complications and infection. Careful preoperative planning based on computed tomography dictates the surgical approach for reduction. A subset of cases may be amenable to early definitive or provisional open reduction and internal fixation based on fracture pattern. In some cases of severe articular comminution where reconstruction is not possible, primary ankle arthrodesis may be a good alternative.

The Influence of Computerized Tomography Imaging on Treatment of Periprosthetic Proximal Femur Fractures

Introduction Periprosthetic femur fractures (PPFF) are increasing in incidence and management of such injuries requires a specialized skill set combined with detailed knowledge of component design. To assist with planning, computed tomography (CT) can be used pre-operatively to give a surgeon more information. No study to date has shown the utility of obtaining preoperative CT. The goal of this study is to show that CT is a useful diagnostic adjunct and report any differences in how subspecialties such as orthopedic traumatologists and arthroplasty surgeons use it. Methods Seventeen PPFF cases met our inclusion criteria. They were shown to six faculty, three trauma and three arthroplasty surgeons. They viewed the plain radiographs and then CTs. After each they filled out the same questionnaire that included their assessment of diagnosis and proposed treatment plan both before and after access to CT imaging. Fleiss and Cohen kappa were used to compare inter- and intra-observer reliability. Results The interobserver kappa values (k) in diagnosis were 0.348 pre- and 0.371 post-CT, while trauma and arthroplasty were 0.328 to 0.260 and 0.821 to 0.881 respectively. The interobserver reliability in treatment was 0.336 pre- and 0.254 post-CT, while trauma and arthroplasty were 0.323 to 0.288 and 0.688 to 0.519. For intraobserver the average k for diagnosis and treatment were 0.818 and 0.671. Broken down by subspecialty they were 0.874 and 0.831 and 0.762 and 0.510 for trauma and arthroplasty. There were 11 diagnostic and 24 treatment changes. Conclusion CT provides diagnostic changes 10% and treatment changes 24% of the time. However, it does not lead to greater agreement among the surgeons on either. Arthroplasty uses CT more to guide both their treatment and the diagnosis, and they agree more than trauma surgeons. Most of the treatment changes come from adding or removing a plate, and the most common diagnostic change was shared by A to B1 and B2 to B3. This suggests fracture extension and bone stock are better evaluated by CT.

Computed Tomography Scan Architectural Measurements in Adult Foot and Ankle Surgery: A Narrative Review for Orthopaedic Trainees

CT scan plays an important role in adult foot and ankle surgery. Plain radiographs are usually the first-line imaging modality for assessing foot and ankle bone and joint architectural abnormalities. However, despite the fact that a CT scan is more expensive and associated with higher radiation exposure, it offers better imaging quality for the assessment of bony lesions in orthopaedics and trauma. Evidence has shown that more accurate measurements can be obtained from a CT scan compared to plain radiographs. Weight-bearing multi-detection CT scanning goes the extra mile by providing a more detailed assessment, especially for intra-articular fractures, and mirrors the real-life foot and ankle dynamics compared to conventional non-weight-bearing CT scans. It also has a relatively lower radiation dose compared to conventional CT scans. CT scan is the best modality for assessing bony lesions whereas MRI is better for soft tissue pathology. An understanding of the role of CT scan in the anatomical assessment of the foot and ankle will help improve communication between orthopaedic surgeons, radiologists, and radiographers. A thorough understanding of when to use a CT scan compared to the other imaging modalities will also lead to better surgical outcomes, reduced cost, and reduced risk from radiation exposure. This review article analyzes the role of CT in assessing relevant radiographic architectural measurements for diagnosis and surgical planning in adult foot and ankle surgery.

Open Reduction and Internal Fixation of a Partial Articular (OTA-43B) Pilon Fracture Through a Direct Anterior Approach

We present the management of an OTA-43B Pilon fracture with a depressed plafond fragment, medial comminution, and displacement of the Chaput fragment. The patient was initially managed with external fixation to gain initial reduction of the pilon fracture and to allow the soft tissues to heal. As demonstrated, the extensile anterior approach can be modified and used to see the anteromedial and anterolateral tibial plafond so an anatomic reduction could be obtained. Also detailed is the reduction and fixation strategy and soft tissue closure, all of which plays a critical role in the outcome.

Roles of Trauma CT and CTA in Salvaging the Threatened or Mangled Extremity

Extremity arterial injuries account for up to 50% of all arterial traumas. The speed, accuracy, reproducibility, and close proximity of modern CT scanners to the trauma bay have led to the liberal use of CT angiography (CTA) when a limb is in ischemic jeopardy or is a potential source of life-threatening hemorrhage. The radiologist plays a critical role in the rapid communication of findings related to vessel transection and occlusion. Another role of CT that is often overlooked involves adding value to surgical planning. The following are some of the key questions addressed in this review: How does CTA help determine whether a limb is salvageable? How do concurrent multisystem injuries affect decision making? Which arterial injuries can be safely managed with observation alone? What damage control techniques are used to address compartment syndrome and hemorrhage? What options are available for definitive revascularization? Ideally, the radiologist should be familiar with the widely used Gustilo-Anderson open-fracture classification system, which was developed to prognosticate the likelihood of a functional limb salvage on the basis of soft-tissue and bone loss. When functional salvage is feasible or urgent hemorrhage control is required, communication with trauma surgeon colleagues is augmented by an understanding of the unique surgical, endovascular, and hybrid approaches available for each anatomic region of the upper and lower extremities. The radiologist should also be familiar with the common postoperative appearances of staged vascular, orthopedic, and plastic reconstructions for efficient clinically relevant reporting of potential down-range complications. Online supplemental material is available for this article. ^©RSNA, 2022.

Management of Pilon Fractures-Current Concepts

Tibial pilon fractures were first described by Étienne Destot in 1911. He used the French word “pilon” (i.e., pestle), to describe the mechanical function of the distal tibia in the ankle joint. This term has further been used to portray the mechanism involved in tibial pilon fractures in which the distal tibia acts as a pestle with heavy axial forces over the talus basically causing the tibia to burst. Many different classification systems exist so far, with the AO Classification being the most commonly used classification in the clinical setting. Especially Type C fractures are extremely difficult to manage as the high energy involved in developing this type of injury frequently damages the soft tissue surrounding the fracture zone severely. Therefore, long -term outcome is often poor and correct initial management crucial. In the early years of this century treatment has evolved to a two–staged protocol, which nowadays is the gold standard of care. Additional methods of treating the soft tissue envelope are currently being investigated and have shown promising results for the future. The aim of this review is therefore to summarize protocols in managing these difficult fractures, review the literature on recent developments and therefore give surgeons a better understanding and ability to handle tibial pilon fractures.

[Retrospective study of 50 cases of tibial pilon fractures in adults at the Department of Orthopedics of the University Hospital Center Habib Bourguiba, Sfax, Tunisia]

Tibial pilon fractures are polymorphic fractures posing therapeutic and prognostic challenges. The purpose of this study is to examine the epidemiological profile of these fractures and to assess our findings from an anatomical and functional point of view. We collected data fom 50 medical records of patients treated for tibial pilon fractures and monitored over the period 2004-2013 at the Orthopedic-Trauma Department of the Habib Bourguiba University Hospital in Sfax. Functional outcomes were assessed using the Ankle-Hindfoot score. Radiological findings were used to determine fracture healing. Treatment was based on internal osteosynthesis in 30 cases, external fixation in 11 cases and on a combination of both techniques in 9 cases. At the end of this study, functional outcomes were good and very good in 36 cases. Thirty cases of fracture healing were reported, with 18 cases of vicious callus and two cases of pseudosteoarthritis. Therapeutic management of tibial pilon fractures is difficult in some cases. Solid osteosynthesis with anatomical reduction is the only therapeutic option to secure a satisfactory functional outcome.

CT mapping for complex tibial pilon fractures: Understanding the injury pattern and its relation to the approach choice

OBJECTIVE

To map OTA/AO type 43C3 tibial pilon fractures by means of computed tomography and analyze the difference between varus and valgus fractures. We hypothesized that valgus fractures are less frequent than varus, and the affected zones of the tibial pilon are different among the patterns.

MATERIAL AND METHODS

Retrospective, cross-sectional, observational study, using images of 73 computed tomographies of patients who had presented OTA/AO type 43C3 tibial pilon fractures. The radiographs and computed tomography were subdivided into two groups: varus and valgus fractures. Also, the presence or absence of fibula fractures. Both groups were subdivided into eight zones: four lateral to the pilon and four medial.

RESULTS

The distribution of total affected zones is significantly different in the male and female subgroups (p = 0.027). The incidence of cases in zone 1 is significantly different in varus and valgus displacement subgroups (p = 0.002). In the patients with valgus displacements, 61.9% of the fractures affect zone 1; in the patients with varus displacements, only 25.8% of the fractures affect zone 1. In the patients without fibula fracture, 58.3% of the fractures affect zone 2; in the patients with fibula fracture, 24.6% of the fractures affect zone 2.

CONCLUSION

The typical profile of the patient with a pilon fracture is age ranging from 27 to 57 years, male, with fibular fracture, and the injury affecting two or three pilon zones, with zones 6, 1, and 3 being the most affected ones. There is no typicality regarding the valgus or varus fracture displacement, although a difference was found in zone 1.

Weight-Bearing CT Scan After Tibial Pilon Fracture Demonstrates Significant Early Joint-Space Narrowing

BACKGROUND

Posttraumatic osteoarthritis (PTOA) is a common and early sequela of tibial pilon fractures resulting in substantial long-term disability. New approaches are needed to objectively and reliably quantify early disease progression in order to critically assess the impact of interventions aimed at preventing or mitigating PTOA. Weight-bearing computed tomography (WBCT) scans provide a means for measuring joint space while the ankle is in a loaded, functional position. We assessed the interrater and intrarater reliability of a standardized, regional method to quantify joint-space loss following tibial pilon fracture compared with the uninjured contralateral ankle.

METHODS

We prospectively enrolled 20 patients with intra-articular tibial pilon fractures that were surgically treated at 1 of 2 level-I trauma centers. Six months after injury, bilateral ankle WBCT scans were obtained. Joint space was measured by 4 reviewers at 9 discrete regions of the tibiotalar articulation on sagittal images. Measurements were repeated by reviewers 2 weeks later. To characterize the measurement method, interrater correlation coefficient estimates and test-retest reproducibility were calculated.

RESULTS

The mean tibiotalar joint space was 21% less in the injured ankles compared with the contralateral uninjured ankles (p < 0.0001). The middle-lateral and middle-central regions of the joint demonstrated the greatest decrease in joint space between injured and uninured ankles. The interrater correlation coefficient of the measurement technique was 0.88, and the test-retest reproducibility was 0.80, indicating good reliability and reproducibility of the method.

CONCLUSIONS

We developed a simple, standardized, and reliable technique to quantify tibiotalar joint space following tibial pilon fracture on WBCT. Significant loss of joint space is seen 6 months after the injury. This tool can be used to longitudinally quantify loss of joint space following pilon fracture and assess the impact of interventions to reduce PTOA.

A New Classification System for Pilon Fractures Based on CT Scan: An Independent Interobserver and Intraobserver Agreement Evaluation

BACKGROUND DATA

A new pilon fracture classification system based on CT scan data was recently published, showing almost perfect interobserver and intraobserver agreement among the authors who developed it. However, an independent assessment has not been done.

OBJECTIVE

To do an independent agreement evaluation of the new pilon fracture classification system with physicians with different levels of expertise in the management of pilon fractures.

METHODS

Seventy-one cases of acute pilon fracture were retrospectively collected. Fractures were classified by six evaluators (three foot and ankle surgeons and three orthopaedic surgery residents) using CT scans according to the morphological grading of the new pilon fracture classification system developed by Leonetti et al. Cases were presented to the same evaluators in a random sequence after a 6-week interval to determine intraobserver agreement. The kappa coefficient (κ) was used to determine agreement among evaluators.

RESULTS

The interobserver agreement was substantial regarding the main fracture type (I, II, III, or IV), with an overall κ value of 0.69 (0.65 to 0.72). When including the II and III subtypes, the overall agreement was still substantial, with a κ value of 0.61 (95% confidence interval: 0.58 to 0.64). The intraobserver agreement was substantial when considering the main fracture categories (I, II, III, or IV), with a κ value of 0.78 (confidence interval: 0.72 to 0.84), and full agreement at the type level was observed in 76% (324/426) of evaluations. There was no notable difference between the foot and ankle surgeons and orthopaedic surgery residents in the interobserver and intraobserver agreement.

CONCLUSION

The new classification system demonstrated substantial interobserver and intraobserver agreement between evaluators with different levels of expertise in the management of pilon fractures. Prospective studies should be done to evaluate its prognostic value and utility in clinical practice.

Does Surgical Approach Influence the Risk of Postoperative Infection After Surgical Treatment of Tibial Pilon Fractures?

OBJECTIVES

To determine whether a particular surgical approach or combination of approaches is a risk factor for infection.

DESIGN

Retrospective review.

SETTING

Two Level-1 trauma centers.

PATIENTS/PARTICIPANTS

Five hundred ninety pilon fractures in 581 patients (66% male) with a median age of 45 years were identified.

INTERVENTION

Open reduction internal fixation of pilon fractures.

MAIN OUTCOME MEASURES

Postoperative deep surgical site infection and risk factors for postoperative deep infection.

RESULTS

The most common primary surgical approach was medial (54%), followed by anterolateral (25%), anteromedial (11%), posterolateral (8%), and posteromedial (2%). A dual approach to the distal tibia was used in 18% of the cases. The overall deep infection rate was 19%. There was no association between primary surgical approach and development of infection (P = 0.19-0.78). Independent risk factors for infection were smoking (hazard ratio, 2.1; P < 0.001) and need for soft tissue coverage (hazard ratio, 6.9; P < 0.001).

CONCLUSIONS

Surgical approach does not appear to be a significant risk factor for postoperative infection after open reduction internal fixation of distal tibial pilon fractures. When treating tibial plafond fractures, surgeons should select the approach they feel best addresses the specific fracture pattern.

LEVEL OF EVIDENCE

Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.

Three-dimensional computed tomography reconstruction improves the reliability of tibial pilon fracture classification and preoperative surgical planning

PURPOSE

In the present study, we aimed to evaluate the impact of two-dimensional multi-planar computed tomography (2D-MP-CT) scans and three-dimensional surface rendering computed tomography reconstruction (3D-SR-CT) on the inter- and intra-observer reliability of four commonly used classification systems for tibial pilon fractures, and on the reliability and validity of surgical treatment planning for fracture fixation.

METHODS

Four observers evaluated computed tomography images of 35 cases with pilon fractures according to the classifications of Rüedi and Allgöwer, AO/OTA, Topliss, and Tang, and recommended a surgical treatment plan, including the surgical approach, implant position, and need for bone graft augmentation. Fractures were first evaluated using 2D-MP-CT, followed by 3D-SR-CT. We calculated the Kappa values for the correlation between the fracture classifications, types of surgical approaches, implant positions, and bone graft recommendations by the observers. Furthermore, we assessed the correlation between the treatment plans recommended by the observers and the actual surgical procedure performed.

RESULTS

All classifications showed poor inter-observer reliability and moderate intra-observer reliability with 2D-MP-CT scans. The inter-observer reliability of the Rüedi and Allgöwer, AO/OTA, and Tang classifications improved to moderate, whereas the intra-observer reliability of the AO/OTA classification improved to good with additional 3D-SR-CT. The correlation between the suggested and the actually performed surgical approaches was poor with 2D-MP-CT, but improved to moderate with 3D-SR-CT. The suggested plate positions showed a moderate correlation with the actually performed plating; although the correlation improved significantly, it remained moderate with 3D-SR-CT.

CONCLUSION

The use of 3D-SR-CT reconstruction can improve the reliability of the Rüedi and Allgöwer, AO/OTA, and Tang classifications. Furthermore, three-dimensional imaging enables a more valid planning of the surgical approach and implant position.

[Modified staging strategy in treatment of type C3 Pilon fractures]

OBJECTIVE

To investigate the safety, feasibility, and effectiveness of modified staging strategy in treatment of type C3 Pilon fractures.

METHODS

The clinical data of 23 patients with type C3 Pilon fractures treated with modified staging strategy between January 2012 and January 2018 was retrospectively analyzed. There were 14 males and 9 females with an average age of 47.9 years (range, 22-61 years). Twenty-three cases were high-energy injuries, including 11 cases of traffic accidents and 12 cases of falling from height. One case was an open fracture of Gustilo type ⅢA with no obvious sign of infection on the wound after early treatment. The remaining patients were closed fractures. The time from injury to admission was 3-40 hours with an average of 16.4 hours. The preoperative pain visual analogue scale (VAS) score was 7.22±1.17 and American Orthopaedic Foot and Ankle Society (AOFAS) score was 0. The flexion and plantar flexion activities of ankle joint were (1.13±0.26) and (4.79±0.93)°, respectively. Twenty-two patients had a tibiofibular fracture. In the first-stage operation, the posterior approach was used to reduce the posterior column fracture and the external stent was temporarily assisted. After the soft tissue crisis was removed, the final fracture reduction and internal fixation was performed through the anterior approach in the second-stage operation.

RESULTS

All 23 patients were followed up 12-84 months with an average of 26.6 months. The waiting time before the first-stage operation was 4-47 hours with an average of 23.4 hours. The interval between the two stage operations was 6-11 days with an average of 7.9 days. The first-stage operation time was 60-90 minutes with an average of 67.8 minutes; the second-stage operation time was 110-160 minutes with an average of 124.1 minutes. The hospital stay was 15-28 days with an average of 23.5 days. One patient (4.35%) had a tourniquet paralysis symptom after the second-stage operation, and two patients (8.7%) had delayed anterior incision healing. The other patients had incision healing without early complications. The radiographic review showed that the quality of articular surface reduction was excellent in 19 cases, good in 2 cases, and poor in 2 cases, with an excellent and good rate of 91.3%. At last follow-up, the fractures healed with no bone nonunion and malunion; the different degrees of osteoarthritis occurred in 7 cases. At last follow-up, the VAS score was 0.89 ±0.88 and the AOFAS score was 81.3±7.8. The flexion and plantar flexion activities of ankle joint were (10.23±5.05) and (20.97±3.92)°, respectively, and the differences between pre- and post-operation were significant ( P<0.05).

CONCLUSION

The midified staging strategy can not only provide a template for articular surface reduction for the second-stage anterior surgery, but also improve the quality of the reduction. It can also reduce the interval between the two operations and the operation time of the second-stage operation through the first-stage posterior fascial decompression, and can obtain satisfactory effectiveness.

Influence of reduction quality on functional outcome and quality of life in treatment of tibial plafond fractures: a retrospective cohort study

Background

The aim of the study was to evaluate the impact of reduction quality, using intraoperative 3D imaging, on quality of life and functional outcome in the operative treatment of tibial plafond fractures.

Methods

A group of patients with tibial plafond fractures was re-examined. The operative treatment was performed between September 2001 and October 2011. The follow-up examination was at least 2 years after the final surgical procedure. Final reduction result was assessed intraoperatively using a mobile 3D C-arm. A categorization with regard to descriptive parameters as well as type and size of joint surface irregularities was performed. Follow-up results were evaluated using: Olerud and Molander (O & M) score, Short-Form-36 (SF-36) score, movement deficit, Kellgren and Lawrence grade of osteoarthritis, and pain intensity.

Results

34 patients with operatively treated tibial plafond fracture could be re-examined. Reduction quality had the greatest influence on functional result measured by the O & M score (p = 0.001) and the PCS domain of the SF-36 score (p = 0.018).

Significant differences with regard to O & M score (p = 0.000), SF-36 score (p = 0.001 to p = 0.02; without MCS domain), movement deficit (p = 0.001), grade of osteoarthritis (p = 0.005) and pain (p = 0.001) could be verified under consideration of the reduction quality. The group with the anatomically more accurate reduction also showed a better result for clinical follow-up and quality of life. Furthermore, it is not the type of joint surface irregularity that is always decisive, but rather the size.

Conclusions

Despite other relevant factors, it appears that reduction quality –which can be analyzed with intraoperative 3D imaging– plays the most important role in postoperative quality of life and functional outcome. Corrections should therefore be performed on joint surface irregularities with a size above 2 mm.

Impact of two- and three-dimensional computed tomography use on intraobserver and interobserver reliabilities of pilon fracture classification and treatment recommendation

BACKGROUND

Two-dimensional (2D) and three-dimensional (3D) computed tomography (CT) have been increasingly used in various intra-articular fractures including pilon fracture. However, no study has investigated intraobserver and interobserver reliabilities of pilon fracture classification using 3D CT images.

HYPOTHESIS

(1) Intraobserver and interobserver agreements of fracture classifications and treatment recommendations will improve by using 2D CT images compared to using plain radiographs only; (2) agreements will improve by adding 3D CT images compared to adding 2D CT images; and (3) agreements of orthopedic residents rather than specialists will be influenced more by imaging modality.

MATERIALS AND METHODS

Ten orthopedic specialists and 10 residents completed a survey to classify the fractures according to the Rüedi-Allgöwer and AO/OTA classifications and to select treatment options using 25 pilon fracture images. The survey was conducted using plain radiographs, with 2D and 3D CT images introduced 3 and 6weeks later, respectively. Kappa coefficients were calculated to determine reliabilities.

RESULTS

Intraobserver reliabilities for fracture classifications in specialists significantly improved by using 2D images compared to using plain radiographs only. Addition of 3D CT did not significantly improve intraobserver reliabilities compared to those with 2D CT. Use of 2D CT images significantly improved overall interobserver agreement of both classifications, with the improvement being greater for residents. Use of 3D CT images did not improve the interobserver reliability of both classifications. Overall interobserver reliabilities for treatment recommendations did not significantly differ according to the imaging modality. However, interobserver agreement among residents significantly improved from slight agreement using radiographs only to fair agreement using 2D CT images.

DISCUSSION

Intraobserver and interobserver reliabilities of pilon fracture classification and treatment recommendations did not improve between using 3D and 2D CT. Using 2D CT images improved the intraobserver and interobserver reliabilities of the fracture classifications in specialists and the interobserver reliabilities of the fracture classifications and the treatment recommendations in residents.

LEVEL OF EVIDENCE

IV, case control study.

Pilon Fractures: Challenges and Solutions

Pilon fractures include a wide range of complexity. The timing and type of definitive fixation is dictated by the soft tissue injury and energy imparted to the fracture. One should have a low threshold for staged protocols and delayed definitive fixation to avoid complications. Proper radiographs and advanced imaging should be obtained for an exacting diagnosis and preoperative planning. Diligent management of the soft tissue and anatomic restoration of the articular surface, length, rotation, and axial alignment with stable fixation to the diaphysis should be obtained once feasible. Intramedullary implants with percutaneous articular fixation for simple or extra-articular patterns provide good results with little soft tissue insult in the zone of injury. Minimally invasive plate osteosynthesis techniques can help mitigate some concerns with soft tissue compromise while obtaining good articular alignment. Locking or conventional plating with lag screw fixation is used for complex articular injuries with or without fibular fixation. External fixators are generally used for temporizing measures but can be utilized as definitive fixation when indicated. There is a role for acute fusion in severely comminuted, osteoporotic, or arthritic fractures in patients with poor healing potential. This article outlines the diagnostic workup and treatment of these vexing injuries with solutions to challenges that arise.

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Traction radiographs versus CT in the evaluation of fracture morphology and consecutive treatment decisions in OTA/AO 43C3 fractures

BACKGROUND

Standard radiographs are limited in the evaluation of fracture characteristics and preoperative planning of OTA/AO 43C3 fractures. Therefore, CT imaging is an accepted as a useful method. CT is however expensive and has high radiation, and traction radiographs could be an alternative. This study aimed to compare fracture fragment and comminution zone visualization between traction radiographs and CT and any potentially resulting differences in consecutive treatment and surgical approach recommendations.

METHODS

Twenty orthopaedic surgeons assessed traction radiographs and CT images of 12 OTA/AO 43C3 type fractures. Each observer was required to identify the anterolateral, posterolateral, and medial malleolus fragments and the lateral, central, and medial shoulder comminution zones. They then had to recommend treatment (nonoperative, ORIF, closed reduction and external fixation, percutaneous screw fixation, or primary tibiotalar arthrodesis) with the best surgical approach (medial, anterolateral, posterolateral, posteromedial, or combined). Intra- and interobserver reliability, correct identification of fracture fragments and comminution zones on both images, and consistency of treatment recommendations and surgical approaches were analyzed.

RESULTS

The agreement of each observer's assessment of the presence or absence of specific fracture fragments and comminution zones was substantially increased for CT as compared to traction radiographs, particularly for the posterolateral (p = 0.000) and anterolateral fragment (p = 0.000), and the lateral (p = 0.000), central (p = 0.000), and medial shoulder comminution zone (p = 0.000). The interobserver reliability when assessing the three fracture fragments and comminution zones on the traction radiographs was moderate, whereas it was substantial when assessing these characteristics on CT. The medial malleolus fragment was more often correctly identified on traction radiographs than CT images (p = 0.001). The ability to correctly identify lateral, central, and medial shoulder comminution zones was higher for CT than traction radiographs (p = 0.000). The treatment and surgical approach recommendations after traction radiograph and CT evaluation were similar (p < 0.05).

CONCLUSIONS

Traction radiographs may be a useful alternative to CT imaging in the preoperative planning of pilon fracture repair. Despite less reliable fracture fragment and comminution zone identification on traction radiographs, treatment recommendations and surgical approach were not influenced.

Ultralow-Dose CT (REDUCTION Protocol) for Extremity Fracture Evaluation Is as Safe and Effective as Conventional CT: An Evaluation of Quality Outcomes

OBJECTIVES

To assess clinical and hospital quality outcomes of patients receiving the previously reported Reduced Effective Dose Using Computed Tomography In Orthopaedic Injury (REDUCTION) imaging protocol.

DESIGN

Retrospective Chart review.

SETTING

Level I Trauma Center and affiliated Tertiary Care Hospital Center.

PATIENTS/PARTICIPANTS

Fifty patients who received this protocol for acute traumatic fracture evaluation and met the inclusion criteria were compared with a cohort of 50 patients matched for age and fracture type who previously received conventional CT scanning for acute traumatic fracture evaluation.

INTERVENTION

Reduced Effective Dose Using Computed Tomography In Orthopaedic Injury (REDUCTION) protocol for diagnostic fracture evaluation.

MAIN OUTCOME MEASURES

Estimated effective radiation doses were calculated and compared using Digital Imaging and Communications in Medicine (DICOM) information from all included studies. Patient outcomes between groups were compared with time to fracture union as the primary outcome. Secondary outcome measures included the presence of complication defined as infection, malunion, nonunion, failure of nonoperative treatment, painful implants, and implant failure. Other secondary quality outcomes that were recorded included readmission within 30 days and hospital length of stay. Functional quality measures included joint range of motion. Statistical analyses were conducted to identify significant differences between cohorts (significance designated as P < 0.05).

RESULTS

Patient characteristics between cohorts were not significantly different with respect to age, sex, body mass index, comorbidities, injury mechanism, or injury location. Fractures of the elbow, hip, knee, and foot/ankle were evaluated. Mean clinical follow-up was 9.5 ± 4.9 months for the REDUCTION cohort and 12.4 ± 5.3 months for the conventional CT cohort. Mean estimated effective dose for all REDUCTION scans was 0.15 milliSieverts (mSv) as compared to 1.50 mSv for the conventional CT cohort (P = 0.037). Preoperative diagnosis was confirmed intraoperatively in 49/50 cases in the REDUCTION cohort compared with 48/50 cases in the conventional CT cohort (P = 0.79). Outcomes including time to union, range of motion, complications, readmission, treatment failure, reoperation, and length of stay were not significantly different between groups.

CONCLUSIONS

The REDUCTION protocol represents ultralow-dose CT developed for minimizing radiation exposure to patients presenting with traumatic fractures. This protocol resulted in a 10-fold reduction in radiation exposure. No difference in clinical or hospital quality outcomes was detected between patients who received this protocol as compared to those receiving automated dose CT. The REDUCTION protocol is a safe and effective method of performing CT for extremity fractures with significantly reduced radiation risk.

LEVEL OF EVIDENCE

Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.

Effect of CT on Management Plan in Malleolar Ankle Fractures

BACKGROUND

Conventionally ankle fractures have been classified using plain radiographs. Because of complex 3-dimensional anatomy and complexity of injuries, plain radiographs may not always be able to clearly depict the complete fracture pattern. There is a paucity of studies regarding the utility of computed tomography (CT) scanning in malleolar ankle fractures (MAFs). Hence, we conducted this study to further understand the role of the CT scan in MAFs.

METHODS

A prospective study of 56 consecutive malleolar ankle fractures was conducted. In the first evaluation by a team of 3 observers, a management plan was made based on plain radiographs. All patients received a CT scan evaluation with a standard protocol. The second evaluation by the same team included formulating an operative plan based on the CT.

RESULTS

In 13 (23.2%) cases, the management plan changed after CT evaluation. In most of the cases, the change in the management plan included an alteration in fixation of the posterior malleolus followed by lateral malleolus in 4 cases. Most of the changes took place in AO 44 type C followed by types B and A. Maximum change was noted in trimalleolar fractures followed by bimalleolar and unimalleolar. The most common morphological characteristic fracture identified on CT scan that was not evident on plain radiography was Chaput fracture in 17 cases.

CONCLUSION

CT scan evaluation of MAFs changed the management plan in a significant number of cases, especially if the fractured fragment included a posterior malleolus, AO type C, and/or if 2 or more malleoli were fractured as noted on plain x rays.

LEVEL OF EVIDENCE

Level IV, case series.

The role of computed tomography scans in diaphyseal femur fractures following gunshot injuries: A survey of orthopaedic traumatologists

The objective of this study was to analyze if the addition of CT changed the management of femoral shaft fractures caused by gunshot wounds when compared to those managed with plain radiography alone.

METHODS

A multiple-choice, single-answer electronic survey was created to compare utility of advanced imaging when treating femur fractures resulting from gunshot injury. A total of ten femoral shaft fracture cause by gunshot injuries were selected for an online survey to be administered to orthopeaedic traumatologists. The survey compared the use the of fixation device and surgical planning before and after the CT scan.

RESULTS

A total of 99 surveys were initiated, of which 82 were completed. For proximal shaft fractures, 37% of experts reported that a CT scan should be ordered based on the radiograph alone, prior to reviewing the CT. After reviewing the CT, 5% of experts reported that they would have performed a "major" change, and 10% reported that they would have performed a "minor" change. 4% of surveyors would have changed their decision regarding ordering a CT. For distal femoral shaft fractures, 42% of experts selected that a CT scan would have been ordered prior to reviewing the CT. After reviewing the CT, 2% would have performed a "major" change, and 8% would have performed a "minor" change in management. 5% of surveyors would have changed their decision regarding ordering a CT.

CONCLUSION

Our study demonstrated that CT scans are relatively unlikely to cause major changes in fracture management of gunshot-induced fractures of femoral shaft.

Pilon fractures: A new classification system based on CT-scan

Actually, pilon fractures are classified according to AO and Ruedi Allgower classification systems based on X-rays. These classifications are less reproducible and do not provide necessary information for proper surgical planning. Aim of the study is to (1) propose a new classification system based on CT scan; (2) to check the prognostic value of this classification and (3) to evaluate its reliability and (4) reproducibility. We retrospectively reviewed 71 cases of pilon fracture. All fractures were classified according to AO, Ruedi Allgower and new proposed classification system by 5 surgeons. Clinical and radiographic evaluation were performed at a mean follow-up of 36 months. Cohen's K value was calculated in order to evaluate the interobserver and intraobserver agreement. Sixty-four of 71 fractures healed. Average AOFAS score was 91,7±7,8 in the Type I of new classification proposed, 87,7±7,8 in the Type II, 82±18,6 in type III, and 67,2±20,9 in type IV. Using the AO classification system the average K weighted value among the five reviewers was 0,51; using Ruedi Allgower classification it was 0,50 and using the new classification system it was 0,88 (p<0.0005). This study demonstrated that the new classification system is prognostic, reliable and reproducible. Moreover it provides a new treatment-oriented classification for this challenging fracture which affect the quality of life of the patients more than chronic diseases like diabetes and coronaropathy or pelvic fractures.

Radiographic Detection of Marginal Impaction in Supination-Adduction Ankle Fractures

BACKGROUND

The purpose of this study was to describe the incidence of plafond impaction in supination-adduction type II (SAD-II) ankle fractures and assess the accuracy of plain radiographs in detecting plafond impaction and predicting planned operative management compared to computed tomography (CT).

METHODS

Patients with SAD-II ankle fractures were retrospectively identified. All SAD-II plain radiographs were reviewed (120 fractures) and compared to CT images (55 fractures). For each plain radiograph or CT scan, 3 orthopedic surgeons were asked the following questions: (1) Is there impaction of the tibial plafond? (2) Does the impaction require direct visualization and articular reduction? The incidence of plafond impaction and the preoperative plan were calculated separately for plain radiographs and CT scans. The accuracy of plain radiographs was calculated using responses from corresponding CT imaging as the gold standard. Change in preoperative management decisions after reviewing CT images was also calculated.

RESULTS

In 120 SAD-II ankle fracture plain radiographs, marginal impaction of the plafond was visualized in 61% of fractures. The diagnosis of impaction using plain radiographs was correct in 84% of fractures when compared to CT imaging, resulting in a 91% positive predictive value (PPV) and a 55% negative predictive value (NPV). Plain radiographs were able to predict planned operative management after review of CT imaging with an 87% PPV and 75% NPV.

CONCLUSION

The majority of SAD-II ankle fractures involved marginal impaction of the tibial plafond. Plain radiographs were accurate in diagnosing impaction when it was present, but were not accurate in ruling out impaction. In the presence of impaction, CT likely will not change planned operative management.

LEVEL OF EVIDENCE

Level III, comparative series.

Intra-articular fractures of the distal tibia: Current concepts of management

Results of the treatment of intra-articular fractures of the distal tibia have improved significantly during the last two decades.Recognition of the role of soft tissues has led to the development of a staged treatment strategy. At the first stage, joint-bridging external fixation and fibular fixation are performed. This leads to partial reduction of the distal tibial fracture and allows time for the healing of soft tissues and detailed surgical planning.Definitive open reduction and internal fixation of the tibial fracture is performed at a second stage, when the condition of the soft tissues is safe. The preferred surgical approach(es) is chosen based on the fracture morphology as determined from standard radiographic views and computed tomography.Meticulous atraumatic soft-tissue handling and the use of modern fixation techniques for the metaphyseal component such as minimally invasive plate osteosynthesis further facilitate healing. Cite this article: EFORT Open Rev 2017;2:352-361. DOI: 10.1302/2058-5241.2.150047.

Optimizing Radiation Dose in Computed Tomography of Articular Fractures

OBJECTIVES

To determine whether a substantially lowered radiation protocol would provide satisfactory information for the surgeon, using the distal tibia as a model.

METHODS

Eleven adult cadaveric distal tibia specimens were used to create Orthopaedic Trauma Association (OTA/AO) 43C distal tibia fractures with varying displacements in 2 planes. Each specimen was scanned at 3 modified protocols, which were then subsequently read by both qualified attending orthopaedists and midlevel residents. Observer reliability was evaluated, as well as confidence levels of identifying fracture pattern and treatment protocols.

RESULTS

On average, there was less than a millimeter of variability in the measured gap to true gap as a whole (mean = 0.74 mm, P < 0.0001). With regard to measurements in gap, pattern, and treatment plans, no significant difference was found between CT images acquired with standard (110 mAs) compared with medium (60 mAs; mean 0.0 mm, P = 1.0; k = 0.14, P = 0.56; k = 0.38, P = 0.13, respectively) and low protocols (45 mAs; mean 0.01 mm, P = 0.95; k = 0.24, P = 0.32; k = 0.31, P = 0.13, respectively). Furthermore, no significant difference was found in measuring step-off across standard, medium, and low radiation dose (0.21 mm, P = 0.46; 0.28 mm, P = 0.39; -0.16 mm, P = 0.48, respectively).

CONCLUSION

The results of this study show no significant difference when evaluating current standard and low-dose CT scans using less than one-half the amount of exposure. This suggests that in complex extremity fractures, a new CT protocol may potentially be used. Our initial data show promise that we may retain satisfactory imaging to formulate a treatment plan while also reducing the collective radiation burden to the population.

Evaluation of Fibular Fracture Type vs Location of Tibial Fixation of Pilon Fractures

BACKGROUND

Comminuted fibular fractures can occur with pilon fractures as a result of valgus stress. Transverse fibular fractures can occur with varus deformation. No definitive guide for determining the proper location of tibial fixation exists. The purpose of this study was to identify optimal plate location for fixation of pilon fractures based on the orientation of the fibular fracture.

METHODS

One hundred two patients with 103 pilon fractures were identified who were definitively treated at our institution from 2004 to 2013. Pilon fractures were classified using the AO/OTA classification and included 43-A through 43-C fractures. Inclusion criteria were age of at least 18 years, associated fibular fracture, and definitive tibial plating. Patients were grouped based on the fibular component fracture type (comminuted vs transverse), and the location of plate fixation (medial vs lateral) was noted. Radiographic outcomes were assessed for mechanical failures.

RESULTS

Forty fractures were a result of varus force as evidenced by transverse fracture of the fibula and 63 were due to valgus force with a comminuted fibula. For the transverse fibula group, 14.3% mechanical complications were noted for medially placed plate vs 80% for lateral plating ( P = .006). For the comminuted fibular group, 36.4% of medially placed plates demonstrated mechanical complications vs 16.7% for laterally based plates ( P = .156). Time to weight bearing as tolerated was also noted to be significant between groups plated medially and laterally for the comminuted group ( P = .013).

CONCLUSIONS

Correctly assessing the fibular component for pilon fractures provides valuable information regarding deforming forces. To limit mechanical complications, tibial plates should be applied in such a way as to resist the original deforming forces. Level of Evidence Level III, comparative study.

How to Get to the Distal Posterior Tibial Malleolus? A Cadaveric Anatomic Study Defining the Access Corridors Through 3 Different Approaches

OBJECTIVE

Our objective is to review the anatomy and exposure of the posterior column and posterior tibial malleolus (the posterior tibial plafond) by defining the access corridors through 3 different approaches-posteromedial, posterolateral, and modified posteromedial.

METHODS

Cadaveric dissection with percentage of posterior tibial malleolus exposed, and strain gauge measurements to evaluate traction on the neurovascular bundle.

RESULTS

The 3 different approaches are applicable for exposure of different portions of the distal posterior tibial malleolus. Strain gauge measurements reveal the least traction on the flap containing the neurovascular bundle with the modified posteromedial approach (7.0 N) compared with the posteromedial (21.5 N) and posterolateral (16.8 N) approaches. Exposure of the posterior tibial malleolus was greater with the modified posteromedial approach (91%) compared with the other 2 approaches (posteromedial = 64%, posterolateral = 40%).

CONCLUSIONS

Depending on the location of the principal fracture fragments, particularly in high energy ankle and pilon fractures, each of the posterior approaches has its indication, with the modified posteromedial approach revealing more of the posterior anatomy than the other 2 approaches. The latter approach places the least traction on the flap containing the neurovascular bundle.

High-energy pilon fractures management: State of the art

High-energy pilon fractures are challenging injuries. Multiple options are described for the definitive surgical management of these fractures, but there is no level I evidence for optimal management. The current management and recommendations for treatment will be reviewed in this article.

Anatomical reduction of the fracture, restoration of joint congruence and reconstruction of the posterior column with a correct limb axis minimising the soft-tissue insult are the key points to a good outcome when treating pilon fractures.

Even when these goals are achieved, there is no guarantee that results will be acceptable in the mid-term due to the frequent progression to post-traumatic arthritis.

In high-energy fractures with soft-tissue compromise, a staged treatment is generally accepted as the best way to take care of these devastating fractures and is considered a local ‘damage control’ strategy.

The axial cuts from the CT scan images are essential in order to define the location of the main fracture line, the fracture pattern (sagittal or coronal) and the number of fragments. All of this information is crucial for pre-operative planning, incision placement and articular surface reduction.

No single method of fixation is ideal for all pilon fractures, or suitable for all patients. Definitive decision making is mostly dependent on the fracture pattern, condition of the soft-tissues, the patient’s profile and surgical expertise.

Cite this article: Tomás-Hernández J. High-energy pilon fractures management: state of the art. EFORT Open Rev 2016;1:354-361. DOI: 10.1302/2058-5241.1.000016.

Primary Arthrodesis for Tibial Pilon Fractures

Staged primary ankle arthrodesis is a viable option for high-energy pilon fractures that are nonreconstructible, in patients with delay in treatment or multiple medical comorbidities, or in patients with peripheral neuropathy. Small retrospective series demonstrate high union and low wound complication rates, although further studies are needed to determine the long-term results. Ankle arthrodesis offers decreased complication rates while eliminating the potential of posttraumatic ankle arthritis pain.

The use of ultra-low-dose CT scans for the evaluation of limb fractures

Aims

To evaluate whether an ultra-low-dose CT protocol can diagnose selected limb fractures as well as conventional CT (C-CT).

Patients and Methods

We prospectively studied 40 consecutive patients with a limb fracture in whom a CT scan was indicated. These were scanned using an ultra-low-dose CT Reduced Effective Dose Using Computed Tomography In Orthopaedic Injury (REDUCTION) protocol. Studies from 16 selected cases were compared with 16 C-CT scans matched for age, gender and type of fracture. Studies were assessed for diagnosis and image quality. Descriptive and reliability statistics were calculated. The total effective radiation dose for each scanned site was compared.

Results

The mean estimated effective dose (ED) for the REDUCTION protocol was 0.03 milliSieverts (mSv) and 0.43 mSv (p < 0.005) for C-CT. The sensitivity (Sn), specificity (Sp), positive predictive value (PPV) and negative predictive value (NPV) of the REDUCTION protocol to detect fractures were 0.98, 0.89, 0.98 and 0.89 respectively when two occult fractures were excluded. Inter- and intra-observer reliability for diagnosis using the REDUCTION protocol (κ = 0.75, κ = 0.71) were similar to those of C-CT (κ = 0.85, κ = 0.82). Using the REDUCTION protocol, 3D CT reconstructions were equivalent in quality and diagnostic information to those generated by C-CT (κ = 0.87, κ = 0.94).

Conclusion

With a near 14-fold reduction in estimated ED compared with C-CT, the REDUCTION protocol reduces the amount of CT radiation substantially without significant diagnostic decay. It produces images that appear to be comparable with those of C-CT for evaluating fractures of the limbs. Cite this article: Bone Joint J 2016;98-B:1668-73.

Computed Tomography Assessment of Peroneal Tendon Displacement and Posteromedial Structure Entrapment in Pilon Fractures

OBJECTIVES

To determine the proportion of (1) peroneal tendon displacement (PTD) and posteromedial structure entrapment (PMSE) cases in a sample of pilon fractures, (2) missed diagnoses of PTD and PMSE on computed tomography (CT) by radiologists and attending orthopaedic trauma surgeons, and PTD and PMSE cases by (3) OTA/AO classification, and (4) fibular fracture.

DESIGN

Retrospective cohort review.

SETTING

Regional level 1 Trauma Center.

PATIENTS/PARTICIPANTS

Two hundred patients treated between July 2008 and November 2014.

INTERVENTION

Axial and reconstructed CT images were used in bone and soft tissue windows to identify PTD and PMSE.

MAIN OUTCOME MEASUREMENTS

Medical charts were reviewed to identify OTA/AO fracture classification, the presence of concomitant fibular fracture, whether radiologist CT interpretation noted PTD or PMSE, and whether attending orthopaedic trauma surgeons' operative notes mentioned recognition of and management of PTD or PMSE.

RESULTS

From the retrospective review of CT, PTD was identified in 11.0% and PMSE in 19.0% of all pilon fractures. Of the 22 patients with PTD, 59.1% sustained a concomitant fibular fracture and 90.9% sustained a 43-C fracture. Patients with PTD sustained more 43-C fractures (90.9% vs. 62.9%) but significantly fewer fibular fractures (59.1% vs. 80.3%; P = 0.023) than patients without PTD. Of the 38 patients with PMSE, 81.6% sustained a fibular fracture and 86.8% sustained a 43-C fracture. PMSE was more common in patients with 43-C fractures (86.8% vs. 61.1%). The final preoperative radiologist CT interpretation commented on PTD and PMSE in 50.0% of cases.

CONCLUSIONS

Higher energy pilon fractures (43-C) are associated with higher incidence of PMSE and PTD. Concomitant fibula fracture may play a protective role in PTD in the setting of pilon fractures. Both attending radiologists and attending orthopaedic trauma surgeons frequently fail to recognize the diagnoses of PTD and PMSE.

LEVEL OF EVIDENCE

Prognostic level III. See Instructions for Authors for a complete description of levels of evidence.

Impact of Intraoperative Cone Beam Computed Tomography on Reduction Quality and Implant Position in Treatment of Tibial Plafond Fractures

BACKGROUND

The intraoperative assessment of the articular surface in displaced intra-articular distal tibia fractures can be challenging using conventional fluoroscopy. The aim of the study was to determine the frequency and the method of intraoperative corrections of fracture reductions or implant placements during open reduction, internal fixation by using cone beam computed tomography (CT) after conventional fluoroscopy.

METHODS

Displaced intra-articular distal tibia fractures were retrospectively analyzed from August 2001 until December 2011. The fractures were classified according to the standards of the AO/OTA as type B or C and treated with open reduction and internal plate fixation. After primary reduction using conventional fluoroscopy, an additional cone beam CT scan was used to determine the alignment of the joint line and the implant position. The number of intraoperative revisions of the primary reduction due to the use of cone beam CT was analyzed.

RESULTS

A total of 143 patients with an intra-articular tibial plafond fracture were included in the analysis. In 43 patients (30%), an intraoperative correction was performed after the cone beam CT scan. In 34 (24%) of these cases, intraoperative correction was required because of inadequate joint line reduction. Nine (6%) corrections were required as a result of a malposition of the implant. The revision rate did not differ by fracture classification.

CONCLUSION

Despite its acceptance as the standard method of imaging, intraoperative conventional fluoroscopy for the assessment of implant positioning and fracture reduction of tibial plafond fractures is limited. The intraoperative utilization of cone beam CT provided additional information for the surgeon to detect insufficient reduction or implant malposition.

LEVEL OF EVIDENCE

Level III, retrospective comparative series.

Ability of modern distal tibia plates to stabilize comminuted pilon fracture fragments: Is dual plate fixation necessary?

OBJECTIVES

The purpose of this study was to examine the screw trajectory of ten commercially available distal tibia plates and compare them to common fracture patterns seen in OTA C type pilon fractures to determine their ability to stabilize the three most common fracture fragments while buttressing anterolateral zones of comminution.

HYPOTHESIS

We hypothesized that a single plate for the distal tibia would fail to adequately stabilize all three main fracture fragments and zones of comminution in complex pilon fractures.

METHODS

Ten synthetic distal tibia sawbones models were used in conjunction with ten different locking distal tibia plate designs from three manufacturers (Depuy Synthes, J&J Co, Paoli, PA; Smith & Nephew, Memphis, TN; and Stryker, Mawa, NJ). Both medial and anterolateral plates from each company were utilized and separately applied to an individual sawbone model. Three implants allowing variable angle screw placement were used. The location of the locking screws and buttress effect 1cm above the articular surface was noted for each implant using axial computed tomography (CT). The images were then compared to a recently published "pilon fracture map" using an overlay technique to establish the relationship between screw location and known common fracture lines and areas of comminution. Each of the three main fragments was considered "captured" by a screw if it was purchased by at least two screws thereby controlling rotational forces on each fragment.

RESULTS

Three of four anterolateral plates lacked stable fixation in the medial fragment. Of the 4 anterolateral plates used, only the variable angle anterolateral plate by Depuy Synthes captured the medial fragment with two screws. All four anterolateral plates buttressed the area of highest comminution and had an average of 1.25 screws in the medial fragment and an average of 3 screws in the posterolateral fragment. All five direct medial plates had variable fixation within anterolateral and posterolateral fragments with an average of 1.8 screws in the anterolateral fragment and an average of 1.3 screws in the posterolateral fragment. The Depuy Synthes variable angle anterolateral plate allowed for fixation of the medial fragment with two screws while simultaneously buttressing the zone of highest comminution and capturing both the anterolateral and posterolateral fragments with five and three screws respectively. The variable angle anteromedial plate by Depuy Synthes captured all three main fracture fragments but it did not buttress the anterolateral zone of comminution.

CONCLUSION

In OTA 43C type pilon fractures, 8 out of 10 studied commercially available implants precontoured for the distal tibia, do not adequately stabilize the three primary fracture fragments typically seen in these injuries. Anterolateral plates were superior in addressing the coronal primary fracture line across the apex of the plafond, and buttressing the zone of comminution. None of the available plates can substitute for an understanding of the fracture planes and fragments typically seen in complex intra-articular tibia fractures and the addition of a second plate is necessary for adequate stability.

LEVEL OF EVIDENCE

Level IV.

Late results after a new therapeutic protocol for soft tissue management in the treatment of tibial pylon fractures

The prospective study targets the tibial pylon fractures admitted in our clinic, to which a new treatment protocol was applied, consisting of two surgical steps, assessing in the end the results achieved at the discharge of the patient and later follows up. The study group consist of 196 patients (198 fractures), in the period 2012-2015.

The average evaluation time was of 16 months. The average age of the patients was 46.5 years (19-83 years), this type of fracture especially affecting active people. The etiology was dominated by high falls (109 cases), most of them being work related accidents. The most frequently applied osteosynthesis principle was staged osteosynthesis which consisted of first stage fibula semitubular plate osteosynthesis and external fixator tibia pylon, followed by minimally invasive or limited approach locked plate tibia pylon fixation. (64.14%) Olerud and Molander clinical score at more than one year after the last surgical intervention highlights good results: excellent results in the amount of 37% to 15% in the first lot, good results 52% to 29%, moderate success 7% to 39% and poor 4% to 17%.

Two stage surgery protocol with external fixation in emergency and minimally invasive internal fixation with locked plate performed after the dissappearance of the local edema, as the second surgical step, allows anatomically correct articular reconstruction without skin complications, with decrease of arthitic late complications.

Staged treatment of pilon fractures

AIM

To evaluate outcomes following staged anterolateral plating of pilon fractures.

METHODS

Over a 5 year period, patients with pilon fractures received four treatment regimens (staged anterolateral plating, staged medial plating, definitive external fixation, early total care). We defined five outcomes (reduction, soft tissue complications, infection, non-union, malunion) and assessed the outcome of fractures treated by these interventions.

RESULTS

Staged anterolateral plating or staged medial plating achieved comparable reduction and soft tissue complications. Staged medial plating had higher infection rates, malunion and non-union rates.

CONCLUSIONS

Staged anterolateral plating is superior to staged medial plating in the management of pilon fractures.

Management of high-energy tibial pilon fractures

Tibial pilon fractures result from high-energy trauma unlike usual ankle fractures. Their management provides numerous challenges to the orthopaedic surgeon including obtaining anatomic reduction of articular surface and the management of associated soft tissue injuries. This article aims to review major advances and principles that guide our practice today. We also discuss a treatment algorithm based on a staged approach to the fracture: initial spanning external fixation followed by definitive fixation.

Complications and early results after operative fixation of 68 pilon fractures of the distal tibia

Background and aims

In this cohort study, we present comprehensive injury specific and surgical outcome data from one of the largest reported series of pilon fractures of the distal tibia treated in a UK tertiary referral centre.

Methods and results

A series of 68 closed pilon fractures were retrospectively reviewed from case notes, plain radiographs and computed tomography imaging. Patient demographics, injury and fracture patterns, methods and timing of fixation and clinical and radiological outcomes were assessed over a mean follow-up period of 7.7 months (1.5–30). Overall, deep infection occurred in 1.6% with superficial infection and wound breakdown occurring in 6.3% of cases. Rates of nonunion and malunion were 7.8%. Radiological posttraumatic arthritis was present in 26.6%, which was symptomatic and requiring orthopaedic management in 9.4%. Further surgery for all causes occurred in 26.6% of cases.

Conclusion

Fixation of these complex fractures in subspecialist units can achieve overall low rates of wound complications, with definitive fixation of selected fractures within 48 h of initial presentation achieving comparable results to those fixed in a delayed fashion. However, this injury continues to have a significant overall complication rate with a high chance of developing early posttraumatic arthritis and of requiring further surgery.

The use of plain radiographs in the classification of distal radius fractures

INTRODUCTION

Classification systems guide surgical planning. We reviewed the accuracy of interpreting plain radiographs to classify distal radius fractures.

METHODS

Pre-operative radiographs of 24 consecutive distal radius fractures were classified using Frykman and AO methods. Classification was repeated intra-operatively under direct vision for comparison.

RESULTS

Mean age of the patients was 51 years. Pre-operative Frykman scores and AO grades were underestimated, compared with intra-operative visual classification (p < 0.001). One over-estimate occurred, while only 3 of 24 cases were classified correctly pre-operatively.

CONCLUSION

Sensitivity of radiographs to classify Frykman or AO grades was 12.5%, indicating interpretation using plain radiographs alone is often inadequate.

Entrapped posteromedial structures in pilon fractures

OBJECTIVES

To analyze a patient cohort who sustained a tibial pilon fracture and report the incidence of interposed posteromedial soft tissue structures.

DESIGN

Retrospective cohort review.

SETTING

Regional Level 1 Trauma Center.

PATIENTS/PARTICIPANTS

About 394 patients with 420 pilon fractures treated between January 2005 and November 2011.

INTERVENTION

Each patient's preoperative radiographs and computed tomography (CT) images were reviewed. The axial and reconstructed images were used in bone and soft tissue windows to identify any posteromedial soft tissue structures incarcerated within the fracture.

MAIN OUTCOME MEASUREMENTS

Medical charts reviewed for the presence of preoperative neurologic deficit, separate posteromedial incision, and whether attending radiology CT interpretation noted the interposed structure.

RESULTS

40 patients with 40 fractures (9.5%) had an entrapped posteromedial structure. The tibialis posterior tendon was interposed in 38/40 fractures (95%) and the posterior tibial neurovascular bundle in 4/40 fractures (10%). Preoperative neurologic deficit occurred in 5/40 patients (12%). A posteromedial incision was used in 11/40 fractures (27%). The attending radiology CT interpretation noted the interposed structure in 8/40 fractures (20%).

CONCLUSIONS

In addition to the osseous injuries, CT imaging can demonstrate the posteromedial soft tissue structures. In our series, the tibialis posterior tendon was commonly incarcerated. In some cases, removal of the entrapped structure(s) may not be possible through the more commonly used anterolateral and anteromedial surgical approaches, and a separate posteromedial exposure may be required. Failure to recognize the presence of an interposed structure could lead to malreduction, impaired tendon function, neurovascular insult, and the need for further surgery.

LEVEL OF EVIDENCE

Prognostic Level IV. See Instructions for Authors for a complete description of levels of evidence.