Introduction. Fibula shortening with an intact anterior tibiofibular ligament (ATFL) and medial ligament instability causes lateral translation of the talus. Our hypothesis was that the interaction of the AITFL tubercle of the fibular with the tibial incisura would propagate lateral translation due to the size differential. Aim. To assess what degree of shortening of the fibular would cause the lateral translation of the talus. Methodology. Twelve cadaveric ankle specimens were dissected removing all soft tissue except for ligaments. They were fixed on a specially-designed platform within an augmented ankle cage allowing tibial fixation and free movement of the talus. The fibula was progressively shortened in 5mm increments until complete ankle dislocation. The medial clear space was measured with each increment of shortening. Results. The larger AITFL tubercle interaction with the smaller tibial incisura caused a significant increase in lateral translation of the talus. This occurred in most ankles between 5–10mm of fibular shortening. The medial clear space widened following 5mm of shortening in 5 specimens (mean=2.0725, SD=±2.5338). All 12 specimens experienced widening by 10mm fibula shortening (Mean=7.2133mm, SD=±2.2061). All specimens reached complete dislocation by 35mm fibula shortening. Results of ANOVA analysis found the data statistically significant (p<0.0001). Conclusion. This study shows that shortening of the fibula causes a significant lateral translation of the talus provided the ATFL remains intact. Furthermore, the interaction of the fibula notch with the ATFL tubercle of the tibia appears to cause a disproportionate widening of the medial clear space due to its differential in size. Knowledge of the extent of fibula shortening can guide further intervention when presented with a patient experiencing medial clear space widening following treatment of an ankle fracture

Objectives

Overlap between the distal tibia and fibula has always been quoted to be positive. If the value is not positive then an injury to the syndesmosis is thought to exist. Our null hypothesis is that it is a normal variant in the adult population.

Determination of ankle stability is straightforward when the injury involves both the medial and lateral malleolus. However it can be challenging when the medial injury involves the deltoid ligament. Radiographic diagnosis of ankle instability highly depends on the measurement of medial clear space. As the shape of talus has been postulated akin to a trapezoid, the medial clear space may be influenced by the portion of talus occupying the mortise. Hence the medial clear space may be influenced by the position of the ankle. We sought to evaluate the impact of ankle plantarflexion and division of the deltoid ligament on the medial clear space. For the study 10 fresh-frozen cadaveric lower limbs were used. Mortise radiographs were taken at neutral, 15 and 30 degrees of plantarflexion and neutral external rotation. These measurements were repeated after dividing the deltoid ligament. To ensure consistent ankle position, the ankle was placed in a specially constructed rig, which recreated the above positions. The medial clear space and talar tilt were measured. Differences in the means between the groups were determined with the paired ‘t’ test and ANOVA within the groups. Statistical significance was set a p-value of 0.05. Increasing the plantarflexion from neutral to 30 degrees in both groups resulted in increase in the medial clear space and talar tilt. The mean increase in medial clear space became statistically significant at 30 degrees when compared to neutral. Between the groups there was a significant difference in medial clear space at 30 degrees plantarflexion. Dividing the deltoid ligament also had a significant effect on talar tilt. Plantarflexion has an influence on the medial clear space in ankle mortise views therefore pre and post ankle fixation radiographs must be interpreted with caution

Supination-external rotation (SER) fractures of the ankle may present with a medial ligamentous injury that is not apparent on the initial radiographs. A cadaver gravity-stress view has been described, but the manual-stress view is considered to be the examination of choice for the diagnosis of medial injuries. We prospectively compared the efficacy of these two examinations. We undertook both examinations in 29 patients with SER fractures. Of these, 16 (55%) were stress-positive, i.e. and had widening of the medial clear space of > 4 mm with a mean medial clear space of 6.09 mm (4.4 to 8.1) on gravity-stress and 5.81 mm (4.0 to 8.2) on manual-stress examination, and 13 patients (45%) were stress-negative with a mean medial clear space of 3.91 mm (3.3 to 5.1) and 3.61 mm (2.6 to 4.5) on examination of gravity- and manual-stress respectively. The mean absolute visual analgoue scale score for discomfort in the examination of gravity stress was 3.45 (1 to 6) and in the manual-stress procedure 6.14 (3 to 10). We have shown that examination of gravity-stress is as reliable and perceived as more comfortable than that of manual stress. We recommend using it as the initial diagnostic screening examination for the detection of occult medial ligamentous injuries in SER fractures of the ankle

Introduction: Rotational forces in ankle injuries can present as isolated lateral malleolus fracture with talar shift or ankle subluxation. It results in medial joint space [clear space] widening, and more than 4 mm is considered significant. The extent of medial soft tissue injury and exploration as a routine is always a debate. Aim: To see if medial clear space widening correlate with medial soft tissue injury. Also to evaluate the out come of these fracture fixation. Materials and Methods: Retrospective study on the management of isolated lateral malleolus fractures with significant medial clear space widening. N=40. Patient group A [25] under went only lateral side fixation and in group B [15] had additional medial side soft tissue exploration as a routine based on medial clear space widening. Fractures were Classified based on the Weber’s system. Pre-operative medial clear space measurement was done by 2 independent observer using PACS measurement tool. Intraoperative details for the method of fixation and the medial soft tissue were analysed. Most common method of fixation is Neutralisation plate for the lateral side. In Weber B type 1/3 rd of the cases had both plate on the lateral side and syndesmotic screw fixation. 2/3rd of them had only plate fixation. In Webers C type, only syndesmotic screw in n=3, Plate and screw n=4, only plate in n=9 cases. Radiological measurement of medial clear space average = 9.08mm, range= 5 –22 mm. Less than 50% of the patients only had medial clinical signs. 26.6% had soft tissue (periosteal injury) and only 6.6% had deltoid ligament injury Out come assessment criterias:. The failure of fixation or any on going medial symptoms in group A. – one case of failure of fixation. Final clinical assessment with ankle score (Olerud and Molander score.) at 6 months average (between 3–18 months). No significant difference in the score, on follow up. Conclusion:. Medial clear space does not correlate with any degree of medial soft tissue injury. Exploration is indicated if widening persist after lateral side fixation. Routine exploration of the medial side has no long term impact on the clinical outcome

Aims. To identify a core outcome set of postoperative radiographic measurements to assess technical skill in ankle fracture open reduction internal fixation (ORIF), and to validate these against Van der Vleuten’s criteria for effective assessment. Methods. An e-Delphi exercise was undertaken at a major trauma centre (n = 39) to identify relevant parameters. Feasibility was tested by two authors. Reliability and validity was tested using postoperative radiographs of ankle fracture operations performed by trainees enrolled in an educational trial (IRCTN 20431944). To determine construct validity, trainees were divided into novice (performed < ten cases at baseline) and intermediate groups (performed ≥ ten cases at baseline). To assess concurrent validity, the procedure-based assessment (PBA) was considered the gold standard. The inter-rater and intrarater reliability was tested using a randomly selected subset of 25 cases. Results. Overall, 235 ankle ORIFs were performed by 24 postgraduate year three to five trainees during ten months at nine NHS hospitals in England, UK. Overall, 42 PBAs were completed. The e-Delphi panel identified five ‘final product analysis’ parameters and defined acceptability thresholds: medial clear space (MCS); medial malleolar displacement (MMD); lateral malleolar displacement (LMD); tibiofibular clear space (TFCS) (all in mm); and talocrural angle (TCA) in degrees. Face validity, content validity, and feasibility were excellent. PBA global rating scale scores in this population showed excellent construct validity as continuous (p < 0.001) and categorical (p = 0.001) variables. Concurrent validity of all metrics was poor against PBA score. Intrarater reliability was substantial for all parameters (intraclass correlation coefficient (ICC) > 0.8), and inter-rater reliability was substantial for LMD, MMD, TCA, and moderate (ICC 0.61 to 0.80) for MCS and TFCS. Assessment was time efficient compared to PBA. Conclusion. Assessment of technical skill in ankle fracture surgery using the first postoperative radiograph satisfies the tested Van der Vleuten’s utility criteria for effective assessment. 'Final product analysis' assessment may be useful to assess skill transfer in the simulation-based research setting. Cite this article: Bone Jt Open 2022;3(6):502–509

The most important determinant of treatment of malleolar fractures is stability. Stable fractures have an intact deep deltoid ligament and do not displace with functional treatment. If the deep deltoid/medial malleolar complex is disrupted, the talus is at risk of displacement. We developed clinical criteria for potential instability and applied them to a prospective series of patients. Criteria included: a medial clear space of < 4mm; medial tenderness, bruising or swelling; a fibular fracture above the syndesmosis; a bimalleolar or trimalleolar fracture; an open fracture; a high-energy fracture mechanism. Patients with a medial clear space of < 4mm and none of these criteria were considered to have stable fractures, while those with a medial clear space of > 4mm were considered to have a displaced fracture. We studied 152 consecutive skeletally mature patients with undisplaced, potentially unstable malleolar fractures treated by the senior author between 1st January 1998 and 31st December 2007. Patients were treated in a below-knee walking cast (136 patients) or a functional ankle brace (16 patients) for six weeks. Weight bearing was encouraged throughout. Weight bearing radiographs were obtained at one week and six weeks. Displacement was defined as talar displacement with a medial clear space > 4mm. Demographic, clinical and radiological data were collected prospectively. There were 88 male and 64 female patients, with a median age of 43 years. Criteria for possible instability were: medial tenderness, 115 patients; proximal fibular fracture, 29 patients; bimalleolar fracture, 17 patients; other criteria, 15 patients. Three fractures displaced (risk of displacement 2.0%, 95% CI 0.4–5.7%). All displaced within the first week and were treated by open reduction and internal fixation. One bimalleolar fracture developed a symptomatic medial malleolar non-union which was treated by percutaneous screw fixation (risk of non-union 5.9%, 95% CI 0.1%–28.7%). All the other fractures achieved clinical union by 8 weeks

Stable Weber B fractures are typically treated non-operatively without complications but require close monitoring due to concerns over potential medial deltoid ligament injuries and the risk of delayed talar shift. Following recent evidence suggesting this is unlikely, a functional protocol with early weight bearing was introduced at Glasgow Royal Infirmary (GRI) following a pilot audit. This study aims to evaluate the risk of delayed talar shift in isolated Weber B fractures managed with functional bracing and early weight-bearing, particularly if signs of medial ligament injury are present. We conducted a retrospective review of 148 patients with isolated Weber B fractures without talar shift at presentation that were reviewed at the virtual fracture clinic at our institution between July 2019 and June 2020. The primary outcome was the incidence of delayed talar shift. Secondary outcomes were other complications and adherence to protocol. 48 patients had medial signs present and of these 1 (2%) showed possible talar shift on X-rays at 4 weeks, and was kept under review. This patient had a normal medial clear space at 3 months. No patients with medial signs not documented (n=19) or not present (n=81) had delayed talar shift. 10% of patients (n=15) had at least 1 complication: delayed union (n=2); non-union (n=3); ongoing pain (n=14). Functional bracing with early weight-bearing is a safe, effective protocol for managing isolated Weber B fractures without initial talar shift. This study concludes that the risk of delayed talar shift is low in all patients, with or without medial signs

Introduction. Deformity of knee joint causes deviation of mechanical axis in the coronal plane, and the mechanical axis deviation also could adversely affect biomechanics of the ankle joint as well as the knee joint. Particularly, most of the patients undergoing total knee arthroplasty (TKA) have significant preoperative varus malalignment which would be corrected after TKA, the patients also may have significant changes of ankle joint characteristics after the surgery. This study aimed 1) to examine the prevalence of coexisting ankle osteoarthritis (OA) in the patients undergoing TKA due to varus knee OA and to determine whether the patients with coexisting ankle OA have more varus malalignment, and 2) to evaluate the changes of radiographic parameters for ankle joint before and 4 years after TKA. Methods. We evaluated 153 knees in 86 patients with varus knee OA who underwent primary TKA. With use of standing whole-limb anteroposterior radiographs and ankle radiographs before and 4 years after TKRA, we assessed prevalence of coexisting ankle OA in the patients before TKA and analyzed the changes of four radiographic parameters before and after TKA including 1) the mechanical tibiofemoral angle (negative value = varus), 2) the ankle joint orientation relative to the ground (positive value = sloping down laterally), 3) ankle joint space, and 4) medial clear space. Results. Of the 153 knees, 59 (39%) had radiographic ankle OA. The knees with ankle OA had significantly more varus mechanical tibiofemoral angle preoperatively than those without ankle OA (− 11.9° vs. − 9.3° on average, respectively; P = 0.003). Compared to the preoperative condition, the ankle joint orientation relative to the ground significantly changed after TKA (from 9.0° to 4.8° on average, P<0.001) while ankle joint space and medial clear space did not. Conclusions. Our study revealed that coexisting ankle OA would be common in patients with varus knee OA, particularly in patients with more varus malalignment. TKA also significantly changes the ankle joint orientation relative to the ground which shows more parallel to the ground. However, its effect on ankle joint space and medial clear space seems to be minimal upto 4 years after TKA. Our findings warrant consideration in preoperative evaluations of ankle OA in varus knee OA patients undergoing TKA, and further studies should evaluate prospectively the clinical implications of radiographic change of the ankle joint after TKA

Introduction. Deltoid ligament reconstruction (DLR) is an important factor in the consideration of pes planus deformity. There is little evidence in the literature determining whether DLR could mitigate the risk of patients acquiring flat foot postoperatively following deltoid ligament injury. Aim. Our objective was to establish if there was a difference in pes planus deformity in patients who underwent DLR during their ankle fracture fixation compared to those who did not. Methods. A retrospective analysis of post-operative weight bearing radiographs was performed of patients who underwent ankle fracture fixation. Inclusion criteria were confirmed deltoid instability presurgery without medial malleolar fracture and post operative weightbearing radiographs at least 6 weeks post-fixation. Patients were categorised into no deltoid ligament reconstruction (nDLR) and having DLR. Radiographic pes planus parameters involved Meary's Angle assessment. Other fracture morphology was classified. Results. A total 723 ankle fractures were screened. 122 patients were included for further analysis. There were 94 patients in the nDLR group and 28 patients in DLR group. The mean Meary's Angle was 15.81 (95% CI 14.06, 17.56) degrees in the nDLR group and −.2 (95% CI −3.86, 3.82) in the DLR group. This was statistically significant (p<.001). There was no significant difference in medial clear space measurements (2.90mm v 3.19mm, p = 0.145). There were significantly more pes planus patients in the nDLR than the DLR group (p<.001, 90.5% vs 25%). Conclusion. In this study there was significantly greater pes planus parameters in patients not undergoing DLR. Patients undergoing DLR had on average normal parameters, whilst those not undergoing DLR had on average severe pes planus. The benefits of DLR are not only maintaining ankle stability but maintaining medial arch integrity, and this should be taken into account in a future study on DLR

Purpose. The aim of this prospective study was to determine the usefulness of a gravity stress view in detecting instability in isolated Weber B fractures of the fibula. Materials and methods. We used a standard protocol for patient selection, exclusion, surgery/conservative management and follow-up. Open fractures, fracture dislocations, those with medial/posterior malleolus fractures and those with preliminary X-rays showing a talar shift/tilt were excluded. If the medial clear space increased beyond 4mm on stress radiographs, surgical reduction and fixation of the lateral malleolus was performed. If this remained 4mm or less conservative treatment was undertaken. We followed these patients at 2, 4, 6 and 12 weekly intervals. Results. We recruited 18 patients with isolated Weber B fractures. In 7 patients the medial clear space increased from 4mm to an average of 6.29 mm (Range 5-7mm). 6 of these 7 patients were operated. The medial clear space remained 4mm or less in the remaining 11 patients and were therefore managed conservatively. No complications were noted in either the surgical or the non-surgical group. None of the conservatively managed fractures showed radiological features of instability on follow up. All the 17 patients who were followed up in our hospital had excellent final AOFAS Scores. Conclusion. We conclude that gravity stress views are useful in determining the stability of Weber B fractures of the ankle

Background. The aim of our study was to assess the ability of orthopaedic surgical trainees to adequately assess ankle radiographs following operative fixation of unstable ankle fracture. Methods and results. We identified 26 Supination-External rotation (SER) stage IV fractures, and 4 Pronation-External rotation (PER) stage III fractures treated surgically in our institution. Radiographs were evaluated for shortening of the fibula, widening of the joint space, malrotation of the fibula and widening of the medial clear space. Trainees were shown these radiographs and asked to comment on the adequacy of reduction. They were then given a simple tutorial on assessing adequacy of reduction and asked to reassess these radiographs. The parameters discussed included assessment of medial clear space, drawing of the tibiofibular line, use of the “circle sign” and measurement of the talocrural angle. There was a statistically significant improvement from 64% to 71.4% (P< 0.05) in the radiographs correctly assessed by orthopaedic trainees following a short tutorial on radiographical assessment. Conclusions. Despite the frequency with which junior surgical trainees deal with ankle fractures, there is a lack of awareness on the objective means of adequately assessing ankle fracture fixation. We highlight this deficiency and demonstrate that a short tutorial on radiographic parameters results in improved assessment and better critical analysis of adequacy of reduction following ankle fracture fixation. As with fractures about the wrist, careful assessment of radiographic parameters should be considered standard practice in assessment of adequacy of reduction in fractures about the ankle

Purpose. The anterior inferior tibiofibular ligament (AiTFL) is the primary lateral ligamentous stabilizer of the ankle syndesmosis. Current syndesmosis repair techniques traverse the tibia and fibula, but do not anatomically reconstruct the AiTFL. We compared a novel AiTFL anatomic repair technique (ART) to rigid syndesmosis screw fixation (SCREW). Method. Twelve cadaveric below knee specimens were compared radiographically and using a biomechanical testing protocol. All specimens underwent a CT scan of the ankle joint prior to testing. Next, the AiTFL, interosseous membrane and deltoid ligament were sectioned, and the posterior malleolus osteotomized, to recreate a trimalleolar-equivalent ankle fracture. The posterior malleolus was repaired with the posterior ligamentous insertions intact and functional (PMALL). Ankles were examined under fluoroscopy with an external rotation stress exam and the medial clear space (MCS) measured. Specimens were then randomized to receive either a conventional syndesmosis screw (SCREW), or the novel anatomic repair technique (ART). External rotation stress fluoroscopy was repeated. A second CT was completed and the fibular position compared to the pre-injury CT. Each specimen was then loaded in external rotation until failure using a custom biomechanical jig. Results. The MCS during stress examination increased by 1.04 0.31mm in the PMALL group. MCS increased significantly less at only 0.300.07mm (p=0.002) in the ART group. The SCREW fixation method demonstrated a delta MCS of 0.280.16mm (p=0.008). Post repair CT showed that 33% of specimens were subluxed from the SCREW group compared to 0% for the ART. Mean torque at failure for ART was 24.85.5Nm compared to 16.85.8Nm for SCREW (p=0.01). Conclusion. Repair of the posterior malleolus alone demonstrated a greater than 1mm of medial clear space widening and is not sufficient to re-establish syndesmotic stability. Addition of the ART or SCREW technique restored syndesmotic stability. None of the ART specimens demonstrated fibular subluxation, while 33% of SCREW specimens were subluxed anteriorly on CT. Biomechanical strength of the ART was found to be greater than that of rigid screw fixation

Ankle fractures are the fourth most common fracture requiring surgical management. The deltoid ligament is considered the primary stabilizer of the ankle against a valgus force. The management of the deltoid ligament in ankle fractures is currently a controversial topic no consensus exists regarding repair in the setting of ankle fractures. The purpose of this systematic review is to examine the role and indications for deltoid ligament repair in ankle fractures. A systematic database search was conducted with Medline, Pubmed and Embase for relevant studies discussing patients with ankle fractures involving deltoid ligament rupture and repair. The papers were screened independently and in duplicate by two reviewers. Study quality was evaluated using the MINORs criteria. Data extraction included post-operative outcomes, pain, range of motion (ROM), function, medial clear space (MCS), syndesmotic malreduction and complication rates. Following title, abstract and full text screening, 10 eligible studies published between 1987 and 2017 remained for data extraction (n = 528). The studies include 325 Weber B and 203 Weber C type fractures. Malreduction rate in studies with deltoid ligament repair was 7.4% in comparison to those without repair at 33.3% (p < 0.05). Eleven (4%) of deltoid ligament repair patients returned for re-operation to have implants removed in comparison to eighty three (42%) of those without repair (p < 0.05). There was no significant difference for pain, function, ROM, MCS and complication rates (p < 0.05). The mean operating time of deltoid ligament repair groups was 20 minutes longer than non-repair groups(p < 0.05). Deltoid ligament repair offers significantly lower syndesmotic malreduction rates and reduced re-operation rates for hardware removal when performed instead of transsyndesmotic screw fixation. When compared to non-repair groups, there are no significant differences in pain, function, ROM, MCS and complication rates. Deltoid ligament repair should be considered for ankle fracture patients with syndesmotic injury, especially those with Weber C. Other alternative syndesmotic fixation methods such as suture button fixation should be explored. A large multi-patient randomized control trial is required to further examine the outcomes of ankle fracture patients with deltoid ligament repair

Introduction. The conservative management of stable Weber B fibula fractures remains variable. We thought that the current trend in our institution poses an unnecessary burden on fracture clinics. Methods. We reviewed patients referred with Weber B ankle fractures over an 18 month period. Our inclusion criteria were non-diabetic adults, with isolated stable Weber B fractures. Fractures were deemed stable if they had no evidence of talar shift on initial radiographs (< 5mm medial clear space and < 1mm variation between superior and medial clear spaces). Exclusion criteria were unstable fractures on radiographs, or no local follow-up. Management was reviewed from case notes and radiographs. Primary outcome was the stability of the fracture by the end of treatment. Secondary measures were duration of treatment, number of follow up appointments and radiographs, and complications. Results. 182 cases were reviewed. 82 were excluded leaving 100 patients for follow-up. Mean age was 53 (18–99). Mean number of outpatient appointments was 2.63 (1–6), follow up radiographs was 2.34 (0–6). 74 were treated in a walking boot and 15 in a walking cast for a mean of 6 weeks (4–9) and allowed to full weight-bear. 10 were kept non weight-bearing in a cast for 6 weeks and 1 was partially weight-bearing. Mean follow-up time was 7.3 weeks (1–30). No fractures displaced and one patient developed an ulcer from a cast. Conclusion. Our study suggests that in isolated Weber B fractures, with no radiographic instability on initial presentation, further displacement is unlikely. We propose that these injuries can be treated safely in a removable boot with full weight-bearing for 6 weeks then clinical and radiologic assessment if required. Casting or restricted weight-bearing does not confer any additional advantage. We question the necessity and rationale behind weekly clinical and radiological follow-up for such cases

During surgical reduction of ankle injuries with syndesmotic instability surgeons often use the anteroposterior (AP) and mortise radiographs to assess reduction. Current literature predicts 50% are malreduced mainly in the sagittal plane. Our aim was to develop a radiographic measure based on the lateral view to assess both the normal and abnormal fibula/tibia relationship after simulated syndesmotic malreduction and to evaluate the effect on commonly used AP and mortise measurements. Nine fresh-frozen cadaveric specimens were dissected to the level of the syndesmosis. AP, mortise and talar dome lateral radiographs were obtained before and following syndesmosis division and posterior fibula displacement. On the lateral radiograph a line was drawn (Orthoview) from the anterior border of the fibula bisecting a line drawn from the anterior to posterior lips of the distal tibia. The ratio of the anterior-posterior segments was calculated. Also a line was drawn from the posterior border of the fibula and the distance was measured to the posterior lip of the tibia. At 0, 2, 4 and 6mm of displacement the ratio measured 1.3±0.2, 1.1±0.2, 0.9±0.2 and 0.7±0.2 respectively with all pairwise comparisons being significantly different. Inter- and intra-observer variability varied from substantial to perfect. The only significant medial clear space (MCS) difference was on the mortise view between 0mm (2.0±0.3mm) and 6mm (2.4±0.4mm) displacement. Our new measure of syndesmotic reduction is reproducible and can detect from 2mm of saggital fibular displacement. At maximum fibular displacement the increase in MCS was less than 1mm. This demonstrates standard mortise radiographs are poor at detecting syndesmotic reduction. An interesting observation was in all specimens prior to any displacement, the posterior fibular line always bisected the posterior lip of the tibia or lay just anterior to it, never posterior. This could serve as a useful adjunct for surgeons when assessing syndesmotic reduction intra-operatively

The most important determinant in the treatment of malleolar fractures is stability. Stable fractures have an intact deep deltoid ligament and do not displace with functional treatment. If the deep deltoid/medial malleolar complex is disrupted, the talus is at risk of displacement. Weber (2010) showed that weightbearing radiographs predicted stability in patients with undisplaced ankle fractures. We developed clinical criteria for potential instability and applied them to a prospective series of patients. Criteria included: medial clear space of < 4mm; medial tenderness, bruising or swelling; a fibular fracture above the syndesmosis; a bimalleolar or trimalleolar fracture; an open fracture; a high-energy fracture mechanism. A consecutive, prospectively documented series of 37 patients chose functional brace treatment of potentially unstable fractures. Weightbearing radiographs were performed in the brace before treatment, and free of brace at clinical union (6–9 weeks in all patients). Patients were encouraged to bear full weight and actively exercise their ankles in the brace. All fractures healed without displacement. The risk of displacement was 0% (95% CI 0–11.2%). This preliminary series gives support for the use of weightbearing radiographs to guide treatment of undisplaced ankle fractures

Assessment of stability in ankle fractures is key in deciding the most appropriate mode of treatment. Stress radiographs have been suggested as a potential method for assessing ankle stability in patients with apparently isolated lateral malleolar fractures. Whilst stress radiographs have been found to be both sensitive and specific in cadaveric experiments, recent clinical studies have suggested that a widened medial clear space (MCS) on stress radiographs may not equate to a functionally unstable ankle. We aimed to assess whether patients with an apparently isolated lateral malleolar fracture on presentation but with a positive gravity stress radiograph (GSR) could be successfully managed non-operatively. A prospective study of all patients with lateral malleolar fractures presenting to our orthopaedic trauma department was undertaken. Patients with an oblique distal fibular fracture pattern and no obvious MCS widening on routine radiographs underwent a GSR. Measurements of the radiographic MCS and superior clear space (SCS) were made and compared with published criteria. 155 patients were included in the study and treated non-operatively fully weight bearing in either a cast or removable boot. Following fracture union all patients had both anatomical alignment of the ankle mortise and good or excellent function. The MCS of 79% of these patients was found to be greater than 4 mm with 19% greater than 6 mm. All of these patients were successfully managed non-operatively. The currently used criteria for measurements on stress radiographs result in high numbers of false positive cases. This may be leading to unnecessary surgery. Further investigation is required in order to identify other clinical or radiographic criteria that may be of use in the assessment of functional ankle stability after fracture

Objective: 36 patients (male:female= 26:10, mean age 40.6 years) with ankle fractures treated with osteosynthesis including a syndesmotic screw were enrolled in this prospective study. Instability of the distal syndesmosis was proven intraoperatively and then a quadricortical syndesmotic screw was placed. Patients were mobilized with an AirCast. ®. ankle brace and cranes for six weeks, then the syndesmotic screw was removed and patients started full weight bearing. Using the x-rays of the ankle before and after and the CT of both ankles before removal of the syndesmotic screw we evaluated the radiologic results: the syndesmotic interval in the axial cuts, the Espace claire de Chaput (total clear space, TCS) und the medial clear space (MCS). Ventralization of the fibula as a measurement for the position of the fibula in the incisura was defined as the difference between the vertical reference lines of tibia and fibula in the CT. The functional results were evaluated by the scores of Phillips, Olerud/Molander and Weber. Results: The mean axial interval difference was 0.83 mm (range -2.6 – 4.5), in seven case (19.4%) the interval had been over corrected. There was one case of subluxation of the talus (2.8%). In 3 patients (8.3%) the syndesmotic screw had been corrected in a second operation after the first CT, in 2 cases (5.6%) the syndesmotic screw had been placed after there was suspection of syndesmotic insufficiency in the x-rays which had been verified by CT. Mean ventralization of the fibula was 2.3mm (range 0–6.4). Average TCS was 5.3 mm (range 3.0 – 8.8), mean MCS was 3.3 mm (range 1.0 – 8.2). The functional scores showed good to very good results in most patients. Conclusions: Only with CT, the correct placement of the syndesmotic screw can be verified, the syndesmotic interval in the axial cuts can be evaluated and the position of the fibula in the Incisura fibularis can be assesed, therefore CT should be postoperative standard after syndesmotic screw placement. If an ankle fracture has not been treated with a syndesmotic screw, postoperative CT of both ankles should be done in any radiological or clinical suspicion of syndesmotic insufficiency

Objective: 15 patients (male:female= 9:6, mean age 39,5 years) with ankle fractures treated with osteosynthesis including a syndesmotic screw were enrolled in this prospective study. Instability of the distal syndesmosis was proven intraoperatively and then a tricortical syndesmotic screw was placed. Patients were mobilized with an AirCast®e brace and cranes for six weeks, then the syndesmotic screw was removed and patients started full weight bearing. Follow-Up was 21.7 weeks mean after removal of the syndesmotic screw. Using the x-rays of the ankle after and the CT of both ankles before removal of the syndesmotic screw we evaluated the radiologic results: the syndesmotic interval in the fontal and axial cuts, the Espace claire de Chaput (total clear space, TCS) und the medial clear space (MCS). The functional results were evaluated by the scores of Phillips, Olerud/Molander and Weber. Results: The mean frontal interval difference was 0,3 mm und the mean axial interval difference was 0,5 mm, in one case Fall (6,7%) there was a axial interval difference of 2 mm and in one case the interval had been over corrected. There was no subluxation of the talus in any patient. In 3 patients (20%) the syndesmotic screw had been placed in a second operation, after there was suspection of syndesmotic insufficiency in the x-rays which had been verified by CT. After implantation of the screw the CT scan showed regular syndesmotic intervals. Average TCS was 5.3 (range 3.40 – 7,40), mean MCS was 2.2 (range 1.0 – 4.5). Average functional scores were: Phillips 118.53 (range 53 – 135), Olerud/Molander 93 (range 60 – 100) and Weber 2.33 (range 0 – 12). Conclusions: Only with CT, the correct placement of the syndesmotic screw can be verified, the syndesmotic interval in the axial cuts can be evaluated and the position of the fibula in the Incisura fibularis can be assesed, therefore CT should be postoperative standard after syndesmotic screw placment. If an ankle fracture has not been treated with a syndesmotic screw, postoperative CT of both ankles should be done in any radiological or clinical suspicion of syndesmotic insufficiency