bluuebunny/crossref_metadata_2025_split huggingface dataset:
Defining Reference Values for the Anatomical Axis of Syndesmosis and Landmark for the Clamp Placement to Minimize Malreduction
Authors: Bhimani Rohan , Ashkani-Esfahani Soheil , Lubberts Bart , Guss Daniel , Kerkhoffs Gino , DiGiovanni Christopher W. , Waryasz Gregory R. 
Published: January 2022

Category: Ankle; Sports; Trauma Introduction/Purpose: Malreduction of the fibula within the incisura is often caused by an eccentric clamp or screw placement and short fibular length. Weightbearing computed tomography (WBCT) has proven to be a reliable method to diagnose syndesmotic instability and can be used as a template to determine the syndesmotic axis and optimal position to place the clamp. We aimed to determine the anatomic axis of the syndesmosis, or the trans-syndesmotic angle (TSA) in healthy individuals on WBCT, and to see if side-to-side and gender based variations exist. We also aimed to determine the clamp's medial tine placement along the trans-syndesmotic axis. Methods: The study group was made up of patient population without ankle injury who underwent bilateral foot and ankle WBCT imaging (n = 100; 200 ankles). Measurements on bilateral WBCT images included: 1) TSA at 1cm, 2cm, and 3cm proximal to tibial plafond, respectively; 2) Medial tine of the clamp positioning at 1cm and 2 cm along the syndesmotic axis. The medial tine clamp position was described in terms of the percentage of anterior to posterior tibial diameter from the anterior cortical boundary. In addition, the aforementioned TSA measurements were compared to historically defined 30 degrees of syndesmotic axis. Paired t-test was used to compare side to side and gender based differences. A p-value < 0.05 was considered statistically significant. Results: In the uninjured healthy population, the mean trans-syndesmotic angles were 17.60, 21.60, and 24.10 at 1cm, 2cm, and 3cm proximal to the tibial plafond respectively. The clamp's medial tine should be positioned 24.7% and 21.3% of the AP tibial cortical distance, posterior to the anterior tibial cortex at 1cm and 2 cm proximal to the tibial plafond. There was no significant side to side or gender based differences for any of the measurements. Additionally, all three weightbearing TSA measurements were significantly larger than the historically defined syndesmotic angle of 30 degrees (p<0.001). Conclusion: Preoperative WBCT imaging provides a reliable template to determine TSA and to plan optimal clamp tine positioning along the syndesmotic axis. Our study has established normal ranges for cross-sectional syndesmotic axis measurements during weight-bearing and established that no differences exist between laterality and gender in patients without syndesmotic injury.
Efficacy of Hook-Type Locking Plate and Cancellous Screw in the Treatment of Displaced Medial Malleolar Fractures in Elderly Patients
Authors: Choi Seung-myung , Cho Byung-Ki 
Published: January 2022

Category: Trauma; Ankle Introduction/Purpose: We aimed to compare the midterm radiologic and clinical results between hook-type LCP and conventional malleolar screws for elderly medial malleolar fractures. We hypothesized that elderly patients treated with the hook- type locking compression plate (LCP) would have better fracture healing and clinical outcomes than those treated with cancellous lag screws, with fewer postoperative complications. Methods: In total, 258 patients treated with a hook-type locking plate (hook LCP group: 121 patients) or partially threaded cancellous lag screws (screw group: 137 patients) over 65 years of age with at least 36 months' follow-up were included in this retrospective study. Radiographic assessments included the union rate and interval to fracture union. Clinical assessment was performed using the American Orthopaedic Foot & Ankle Society (AOFAS) hindfoot score, Olerud and Molander score (OMAS), visual analog scale (VAS) pain score, and postoperative complications. Results: The comminuted fracture rate was higher in the hook LCP group than in the screw group ( p < .001). The interval to fracture union was significantly shorter in the LCP group than in the screw group (10.2 +- 7.0 vs. 12.3 +- 6.7, p =.015). There were no significant differences between the two groups regarding AOFAS, OMAS, and VAS pain scores at the final follow- up. There was a trend toward a lower rate of complications, including revision procedures, in the hook LCP group than in the screw group (19.9% vs. 28.5%, p =.107 and 6.6% vs. 13.9%, p =.074). The overall cost in the hook LCP group was 5.8% lower than that of the screw group despite the higher cost of the hook-type LCP. Conclusion: Hook-type LCP may be an alternative option for treating medial malleolar fractures with comminution in elderly patients.
Patient Reported and Functional Outcomes for Revision Lateral Ankle Ligament Reconstruction
Authors: Dworak Theodora C. , Cohen Bruce E. , Davis W. Hodges , Ellington J. Kent , Jones Carroll P. , Shawen Scott B. , Irwin Todd A. 
Published: January 2022

Category: Sports; Ankle Introduction/Purpose: Despite multiple surgical treatment options for revision lateral ankle ligament reconstruction surgery, few studies describe the functional or patient reported outcomes. The purpose of this study is to describe the patient reported and functional outcomes for patient who required revision lateral ankle ligament reconstruction. Methods: We present follow-up of 26 patients who underwent revision lateral ankle ligament reconstruction between January 2010 and December 2019 at a single institution. Clinical notes and operative reports were reviewed to determine surgical techniques. Patient reported outcomes were completed using the Foot and Ankle Outcome Score (FAOS), Visual Analog Scale Pain, Visual Analog Scale for Ankle Instability, and Visual Analog Scale for Satisfaction. Functional outcome was evaluated with the hop test. Ankle stability was evaluated on physical exam with anterior drawer and inversion stress test. Results: Initial ligament reconstruction consisted of Brostrom (n=15), Brostrom Evans (n=3), Allograft (n=2) and Unknown (n=6). Revision lateral ligament reconstruction consisted of Brostrom (n=15), Brostrom Evans (n=2) and Allograft (n=9). Median follow up time after revision was 22 months. At last follow up, 20 patients (76.9%) had grade 0 inversion stress and anterior drawer test indicating stability. Median FAOS ADL sub score was 97 and median FAOS Symptom sub score was 79. Median VAS Pain was 3, median VAS Instability was 3 and median VAS satisfaction was 9.5. The single-leg hop test (Limb Symmetry Index %) was completed by 18 patients, with median score of 86.4% compared to their non-operative extremity. Six patients had persistent pain, three of which required additional surgery. Conclusion: The high majority of patients that require revision lateral ankle ligament reconstruction maintain a stable ankle on exam and are satisfied with their surgical results. Functional outcomes are similar but not symmetrical to their non-operative extremity.
Correction of Ankle Varus Deformity using Patient Specific Dome Shaped Osteotomy Guides Designed on Weight Bearing CT
Authors: Faict Sebastian , Burssens Arne , Kristian Buedts 
Published: January 2022

Category: Ankle Arthritis; Hindfoot Introduction/Purpose: Dome shaped supramalleolar osteotomies are a well-established treatment option for correcting ankle deformity. However, the procedure remains technically demanding and is limited by a two-dimensional (2-D) radiographic planning of a three-dimensional (3-D) deformity. Therefore, we implemented a weight-bearing CT-scan (WBCT) to plan a 3-D deformity correction using patient specific guides. Methods: A 3-D guided dome shaped supramalleolar osteotomy was performed to correct ankle varus deformity in a cohort of 5 patients with a mean age of 53,8 years (range: 47-58). WBCT images were obtained to generate 3-D models, which enabled a deformity correction using patient specific guides. These technical steps are outlined and associated with a retrospective analysis of the clinical outcome using the EFAS score, Foot and Ankle Outcome Score (FAOS) and Visual Analog Pain scale (VAS). Radiographic assessment was performed using the tibial anterior surface angle (TAS), tibiotalar angle (TTS), talar-tilt angle (TTA), hindfoot angle (HA), tibial lateral surface angle (TLS) and tibial rotation angle (TRA). Results: The mean follow-up was 40,8 months (range 8-65) and all patients showed improvements in the EFAS score, FAOS and VAS (p < 0.05). A 3-month postoperative WBCT confirmed healing of the osteotomy site and radiographic improvement of the TAS, TTS and HA (p<0.05), but the TTA and TRA did not change significantly (p>0.05). Conclusion: Dome shaped supramalleolar osteotomies using 3-D printed guides designed on WBCT, are a valuable option in correcting ankle varus deformity and mitigates the technical drawbacks of free-hand osteotomies.
Prospective Radiographic Assessment of Intraoperative Range of Motion with Total Ankle Replacement
Authors: Gagné Oliver , Bitar Rogerio C. , Kim Jaeyoung , Caolo Kristin C. , Saito Guilherme H. , Cody Elizabeth , Deland Jonathan T. , Ellis Scott J. , Demetracopoulos Constantine A. 
Published: January 2022

Category: Ankle Arthritis Introduction/Purpose: One of the proposed benefits of total ankle replacement, when compared to ankle fusion is the preservation of range of motion (ROM) of the ankle. Preservation of ankle motion may improve quality of life as evidenced by patient-reported outcome measures (PROMs). However, despite improving dorsiflexion intraoperatively during TAR, studies have not demonstrated large improvements in dorsiflexion (DF) at final followup after TAR. The objective of this study was to radiographically evaluate and quantify preoperative, intraoperative ankle dorsiflexion and plantarflexion (PF), compare it to post- operative ankle ROM, and determine the effect of Achilles lengthening (TAL) on preserving dorsiflexion motion that is gained during surgery. Methods: This prospective study compared 111 patients with an average age of 62.3 years who underwent primary total ankle replacement with one of four different implants between March and December 2019. A total of 71 patients (64%) had an associated TAL based on the surgeon's decision. Intraoperative fluoroscopy was utilized by the primary surgeon to document the maximal dorsiflexion and plantar flexion at the end of the case. This was completed after the TAL on a perfect lateral. Standardized weight bearing at maximum ROM positions lateral radiographs were obtained twelve months postoperatively. The change in range of motion was analyzed using a paired t-test with a significance level of 0.05. Results: The cohort's preoperative range was 22.0° (8.1°DF, 14°PF) and was increased to 38.5° intraoperatively (12.7°DF, 25.8°PF) as described in Table 1. Postoperative ROM is 24.9° (11.7°DF, 13.2°PF) which means that 65% of the intraoperative ROM is preserved. Preoperative and intraoperative range of motion was not different between the group that had a TAL compared to no TAL. At the year postoperatively, the dorsiflexion was similar between both groups. The group who did not have a TAL went from 12.8 intraoperatively to 12.2° postoperatively whereas the group who had a TAL went from 12.2° to 11.3° which was statistically equivalent. Conclusion: This study is the first to assess how much ankle range of motion is retained after TAR. Overall, we observed that 65% of dorsiflexion was retained after TAR. TAL as a concomitant procedure did not effect the proportion of dorsiflexion motion that was retained. Additional studies are needed to determine how to best optimize and increase ROM after TAR.
The Adelaide Experience: Short Term Results with the Use of Cartiva Implant
Authors: Genuth Gil , Stavrou Peter , Brown Christopher H. 
Published: January 2022

Category: Midfoot/Forefoot Introduction/Purpose: Hallux rigidus is the most common arthritic condition of the foot. There are only few surgical options that does not require fusing the 1st MTPJ thus allowing motion in the joint. A new first metatarsophalangeal (MTP) joint hemiarthroplasty with a polyvinyl alcohol (PVA) hydrogel implant (Cartiva) has demonstrated pain relief and functional outcomes equivalent to first MTP arthrodesis at 2 and 5 years postoperation in few studies done in North America. We would like to present the Adelaide short term result with the use of this implant. Methods: 40 Patients who underwent first PVA hydrogel MTP hemiarthroplasty in Adelaide by two senior foot and ankle surgeons (C.B and P.S) and by two international foot and ankle fellow (G.G and J.P) between 2017 and 2019 were included in this study. The follow up period was 24 months postoperation. Patients underwent physical examination and radiographic evaluation and completed a pain VAS, the Short-Form-36 (SF-36), and the Foot and Ankle Ability Measure (FAAM) sports subscale and activities of daily living (ADL) subscale. At the time of this study, 40 patients had reached 2 year follow-up. Results: There were no lost to follow up, leaving 40 patients with mean age 63.4 (range, 40.1-79.9) years. Mean follow-up was 24 months (range, 6-30 months). Postoperative active MTP natural joint dorsiflexion and peak MTP dorsiflexion were mean 18.2 (range, 10.0- 30.0) and 29.7 (range, 10.0-45.0) degrees, respectively. Pain VAS, SF-36, FAAM ADL, and FAAM Sports scores demonstrated clinically and statistically significant improvements. Radiographically, no patient demonstrated changes in implant position, implant loosening or subsidence, or implant wear. One implant was removed because of persistent pain 7 months post surgery and was converted to fusion 3 months after the removal of the Cartiva implant. Conclusion: Short term results for the use of Cartiva implant in Adelaide show that functional outcomes improved significantly, pain was reduced significantly, and the implant demonstrated excellent survivorship. Our results are similar for those described in the North American literature
Deep Learning Improves the Accuracy of Weightbearing CT Scan in Detecting Subtle Syndesmotic Instability
Authors: Guss Daniel , Mojahed-Yazdi Reza , Ashkani-Esfahani Soheil , Bhimani Rohan , Waryasz Gregory R. , Kerkhoffs Gino , Lubberts Bart , DiGiovanni Christopher W. 
Published: January 2022

Category: Ankle; Trauma Introduction/Purpose: Weightbearing CT (WBCT) scan provides an ability to compare the ankle joints bilaterally in a 3D manner under physiologic load. According to our recent investigations, 3D volume measurement of the syndesmosis, if measured up to 5cm proximal to the tibial plafond, can detect the instability with an accuracy of 90%, sensitivity of 95.8%, and specificity of 83.3%. However, these values can differ based on the knowledge and experience of the human interpreter. Deep learning, as a subset of machine learning, has shown promising potentials in processing and analyzing images and detecting abnormalities within the images using deep convolutional neural networks (DCNN). Herein, we aimed to assess the accuracy, sensitivity, and specificity of 3D volume WBCT evaluation using DCNN algorithms in patients with subtle syndesmotic instability. Methods: In this study 140 bilateral ankle WBCT scans of patients with subtle syndesmotic instability who were diagnosed intraoperatively were allocated to the patient group. The control group comprised 140 bilateral ankle WBCT images of healthy individuals. We utilized inception V3 model for our DCNN. Data augmentation and transfer learning were used; however, the images were not preprocessed in terms of change in size and resolution. The data were divided as 80:10:10 for training, validation, and test subsets, respectively. The outcome of the study was expressed as sensitivity, specificity, F-score, and the area under the curve (AUC). Results: The performance of our DCNN algorithm showed a sensitivity of 99.41%, specificity of 99.34%, F-score of 99.37%, and 99.99% AUC ( Figure 1 ). The change in loss value of the train data was plateaued after 40 iterations. Axial images were the most appropriate images that were used by the algorithm to detect the instability. Conclusion: In this study we observed that using DCNN in the process of WBCT image interpretation for diagnosis of syndesmotic instability, particularly in subtle cases, makes this modality almost perfect with a very small chance of missing a case. Training a DCNN using a greater number of inputs is still recommended to improve the validity and reliability of this method. Providing a heat map will also help clinicians discover the process of decision-making by these algorithms as DCNNs are sometimes called 'black box'.
Radiographic Evaluation of Isolated Continuous Compression Staples for Akin Osteotomy Fixation
Authors: Horner Kevin , Fiala Kyle , Summerhays Benjamin , Schweser Kyle M. 
Published: January 2022

Category: Bunion; Other Introduction/Purpose: The use of continuous compression implants (nitinol staples) in orthopaedic surgery has increased secondary to advances in metal alloy engineering. Biomechanical studies provide useful data supporting the theoretical use of nitinol staples in the foot and ankle. However, clinical data is limited. The purpose of this study was to determine the overall effectiveness, both clinically and radiographically, of continuous compression implants (nitinol staples) to achieve bony healing in the medially based, closing-wedge osteotomy of the proximal phalanx of the great toe (Akin osteotomy). Methods: A retrospective chart review was performed on 104 patients (107 feet) who underwent an Akin osteotomy using nitinol staples between January 1st, 2018 and February 20th, 2020. The primary outcome variable was radiographic evidence of healing on x-ray. X-rays were independently reviewed by three board-certified foot and ankle surgeons. All investigators were blinded towards the x-rays, and x-rays were randomized in terms of timing from surgery. Each investigator reviewed digital radiographs independently and recorded their radiographic finding responses. Osteotomies were deemed healed if greater than 50% of the osteotomy contained bridging bone. A partially healed osteotomy was defined as some bridging bone, but less than 50% of the overall osteotomy site, and a nonunion was defined as no healing seen radiographically, broken hardware, or loss of reduction. Results: Radiographic union (partial or full) was seen in 95% of Akin osteotomies (96/101) based on our parameters, with no loss of initial reduction. Only 2.8% (3/107) of the patient population had unplanned return to the operating room for reasons associated with the Akin osteotomy: one infection (0.9%), one irritable hardware removal (0.9%), and one traumatic disruption of fixation (0.9%). None of the eligible staples (0/106) were found to be fractured upon radiographic analysis. Smokers and diabetics represented 4.8 and 8.7 percent of the patient population, respectively. Conclusion: Since its inception in 1925, the Akin osteotomy has been described using several types of fixation methods. The results of this retrospective study show that continuous compression implants (nitinol staples) are a viable option for Akin osteotomy fixation, with low rates of complications (2.8%, 3/107) and high healing rates (95%, 96/101). Staples are lower profile, eliminating hardware irritation and potential secondary surgeries, are technically less demanding, and time of application is decreased when compared to other fixation methods. They offer the benefit of continuous compression of the fusion site, as well, and are rigid enough to maintain reduction.
Diagnosis of the Achilles Insertional Tendinopathies by Algometry
Authors: Mansur Nacime S. , Pereira Vinícius F. , Monteiro Cunha Henrique C. , Yamada André F. , Matsunaga Fabio Teruo , Sugawara Tamaoki Marcel J. 
Published: January 2022

Category: Ankle; Hindfoot Introduction/Purpose: Diagnosis of Achilles insertional tendinopathies (AIT) is based on pain by tendon palpation. However, there is no consensus or standard regarding the amount of force to be used during the evaluation. The algometry is a method of measuring the pressure applied in a specific region and can be a method for determining diagnosis values. Goal: To determine a cut-off value for Pain Threshold (PT) in the assessment of AIT. Methods: Design: This is a prospective case-control study of diagnostic accuracy, to develop a diagnostic criterion. Methods: Forty asymptomatic individuals and forty patients with insertional Achilles tendinopathy, matched by age and sex, were evaluated, and submitted to algometry for PT and for Visual Analogical Scale (VAS) levels with 3kg/f at the insertion of the calcaneal tendon by two different evaluators. Inter-observer reproducibility was accessed through the interclass correlation index (ICC). Sensitivity and specificity calculation of PT and of VAS were calculated and plotted on a ROC (Receiver Operator Characteristic) curve. Results: The lowest ICC found was 0.788. Regarding the diagnosis through TP, the 4.08 kg/f mark showed the best relation between sensitivity and specificity (92.5% and 92.5%, respectively). Algometry values lower than 4.08 were considered positive for disease. For the diagnosis of TIA through VAS with 3kg/f, the value of 2.98 was determined (sensitivity of 92.5% and specificity of 97.5%). Conclusion: This study showed that algometry is a reliable method in the assessment of Achilles insertional tendinopathies, having a high intra-observer reproducibility. The painful threshold for establishing the diagnosis of Achilles insertional tendinopathies was 4.08 kg/, with values below this number considered altered.