Hasil untuk "Orthopedic surgery"

Sagar Deshpande, Prerna Ghodke, Sachin Kale et al.

Steven Bradley Graefe MD, Noel A. Jeansonne MD, Andrew Meister MD et al.

Category: Trauma Introduction/Purpose: Before presenting for an orthopaedic clinical evaluation, patients have access to numerous resources on common orthopaedic injuries, their management, and related procedures. Recently, artificial intelligence (AI)-driven chatbots have provided a platform for patient engagement - encompassing various topics ranging from basic skills modules to detailed literature reviews. ChatGPT (OpenAI), a recently developed AI-based chat model, is one application that has rapidly grown in popularity and has garnered worldwide media attention. Utilizing common language communication, this technology allows patients to engage with an interface that supplies convincing, human-like responses. Given the likelihood that patients may turn to this technology for orthopaedic and preoperative education, we sought to determine whether ChatGPT could effectively answer frequently asked questions regarding ankle fractures. Methods: Frequently asked questions (FAQs) pertaining to ankle fractures were identified through an online search engine (Google). A compilation of commonly encountered questions regarding ankle fractures was generated, followed by a comprehensive review of all identified questions. A final set of twelve questions deemed pertinent and frequently encountered in clinical settings was determined by the authors (N.J.& B.G.). These twelve questions regarding ankle fractures were posed to the chatbot during a conversation thread on January 14th, 2024, without follow-up questions or any repeat queries. Each response was analyzed for accuracy utilizing an evidence-based approach. Three authors (P.J., K.P., & A.M.) board-certified in orthopaedic surgery independently rated each question response from ChatGPT in a blinded, sequential fashion. Ratings were designated as 1. “excellent response not requiring clarification,” 2. “satisfactory requiring minimal clarification,” 3. “satisfactory requiring moderate clarification,” or 4. “unsatisfactory requiring substantial clarification.” Results: None of ChatGPT’s responses received an “unsatisfactory” rating from the authors. Just under half (5/12) of the responses required “minimal clarification,” with 4 “not requiring clarification.” 3 responses were reported to require “moderate clarification.” Although several responses required nuanced clarification, the chatbot’s responses were reported to be generally unbiased and evidence-based. More complex queries were likely to receive ratings “requiring minimal clarification” or “requiring moderate clarification,” including those regarding clinical decision-making, indications for preoperative workup and surgery, benefits and drawbacks, and complications. All participants would consider using ChatGPT to improve their patient education materials and expressed willingness to use ChatGPT to help create future patient education material. Conclusion: The ChatGPT AI chatbot may have the potential to provide evidence-based responses to questions commonly asked by patients regarding ankle fractures. ChatGPT may provide a unique and valuable clinical tool for patient education and establishing a basic understanding of ankle fractures before consultation with an orthopaedic surgeon.

Negin Ghamsarian, Doris Putzgruber-Adamitsch, Stephanie Sarny et al.

A critical yet unpredictable complication following cataract surgery is intraocular lens dislocation. Postoperative stability is imperative, as even a tiny decentration of multifocal lenses or inadequate alignment of the torus in toric lenses due to postoperative rotation can lead to a significant drop in visual acuity. Investigating possible intraoperative indicators that can predict post-surgical instabilities of intraocular lenses can help prevent this complication. In this paper, we develop and evaluate the first fully-automatic framework for the computation of lens unfolding delay, rotation, and instability during surgery. Adopting a combination of three types of CNNs, namely recurrent, region-based, and pixel-based, the proposed framework is employed to assess the possibility of predicting post-operative lens dislocation during cataract surgery. This is achieved via performing a large-scale study on the statistical differences between the behavior of different brands of intraocular lenses and aligning the results with expert surgeons' hypotheses and observations about the lenses. We exploit a large-scale dataset of cataract surgery videos featuring four intraocular lens brands. Experimental results confirm the reliability of the proposed framework in evaluating the lens' statistics during the surgery. The Pearson correlation and t-test results reveal significant correlations between lens unfolding delay and lens rotation and significant differences between the intra-operative rotations stability of four groups of lenses. These results suggest that the proposed framework can help surgeons select the lenses based on the patient's eye conditions and predict post-surgical lens dislocation.

Botao Zhao, Mojtaba Esfandiari, David E. Usevitch et al.

Cooperative robots for intraocular surgery allow surgeons to perform vitreoretinal surgery with high precision and stability. Several robot structural designs have shown capabilities to perform these surgeries. This research investigates the comparative performance of a serial and parallel cooperative-controlled robot in completing a retinal vessel-following task, with a focus on human-robot interaction performance and user experience. Our results indicate that despite differences in robot structure and interaction forces and torques, the two robots exhibited similar levels of performance in terms of general robot-to-patient interaction and average operating time. These findings have implications for the development and implementation of surgical robotics, suggesting that both serial and parallel cooperative-controlled robots can be effective for vitreoretinal surgery tasks.

Jing Shen, Ruiqing Ji, Sai Yao et al.

Objectives Prosthesis awareness is the perception of foreign bodies, which has a critical effect on the function of the prosthetic joint. In total hip arthroplasty (THA), the direct anterior approach (DAA) has more advantages than the posterior approach (PA), including superior rehabilitation outcomes. This study was to evaluate the recovery of “prosthesis awareness” through these two approaches. Methods Three hundred and seventy‐six patients who received THA with either DAA (n = 41) or PA (n = 335) from January 2016 to December 2017 were retrospectively analyzed. The Forgotten Joint Score‐12 (FJS‐12), Harris hip score (HHS), and visual analog scale (VAS) analyses were used to evaluate the recovery of “prosthesis awareness” in these patients 2 weeks, 1, 3, 6, and 12 months after surgery. The student t‐test, Wilcoxon rank sum test, chi‐square test, and MANOVA were used to compare the differences among groups. Results We found that DAA patients had higher FJS‐12 scores than PA patients at 2 weeks (42.15 ± 3.36 vs. 38.09 ± 3.28, p = 0.042), 1 month (49.06 ± 5.14 vs. 41.11 ± 5.21, p = 0.038), and 3 months (53.23 ± 4.07 vs. 48.09 ± 3.71, t = 3.152, p = 0.045). And the recovery rates of FJS‐12 scores in DAA and PA groups at 2 weeks, 1 month, and 3 months after surgery were 75.46% ± 6.04%, 84.05% ± 6.57%, 91.37% ± 7.13%, and 74.14% ± 5.54%, 78.16% ± 6.01%, 88.23% ± 6.42%, respectively. To compare the recovery effects of the two procedures in more detail, we classified the 12 items in FJS‐12 that evaluate different types of gravity center motions into three categories: low‐movement group (LG), middle‐movement group (MG), and high‐movement group (HG). Interestingly, DAA patients had significantly higher HG than PA patients at 2 weeks, 1 month, and 3 months after operation (t = 3.225, p = 0.022 at 2 weeks, t = 3.081, p = 0.041 at 1 month and t = 2.783, p = 0.046 at 3 months), whereas no significant differences were observed in LG‐ and MG‐related items. In addition, there were no significant differences in HHS and VAS scores between DAA and PA patients at 2 weeks (p = 0.102, p = 0.093), or from 1 month to 12 months (each p > 0.05). Conclusions DAA‐mediated THA is superior to PA in terms of prosthesis adaptability and recovery of hip joint motion in the first 3 months after surgery, especially concerning high‐movement gravity center motions.

Teruya Ishibashi, MD, PhD, Tetsuya Tomita, MD, PhD, Masashi Tamaki, MD, PhD et al.

A 75-year-old woman presented with progressive bilateral knee pain and severe genu valgum. She could walk utilizing braces and T-canes, with a 20° flexion contracture and 150° of maximum flexion. During knee flexion, the patella laterally dislocated. Radiographs demonstrated severe bilateral lateral tibiofemoral osteoarthritis and patellar dislocation. She underwent posterior-stabilized total knee arthroplasty without patellar reduction. After implantation, the knee range of motion was 0°-120°. Intraoperative findings revealed that the affected patella was too small, low articular cartilage volume resulted in the diagnosis of nail patella syndrome with the tetrad of nail dysplasia, patella dysplasia, elbow dysplasia, and iliac horn. At the 5-year follow-up visit, she could walk without a brace and had a knee range of motion (10°-135°) with clinically favorable results.

Yuehao Wang, Yonghao Long, Siu Hin Fan et al.

Reconstruction of the soft tissues in robotic surgery from endoscopic stereo videos is important for many applications such as intra-operative navigation and image-guided robotic surgery automation. Previous works on this task mainly rely on SLAM-based approaches, which struggle to handle complex surgical scenes. Inspired by recent progress in neural rendering, we present a novel framework for deformable tissue reconstruction from binocular captures in robotic surgery under the single-viewpoint setting. Our framework adopts dynamic neural radiance fields to represent deformable surgical scenes in MLPs and optimize shapes and deformations in a learning-based manner. In addition to non-rigid deformations, tool occlusion and poor 3D clues from a single viewpoint are also particular challenges in soft tissue reconstruction. To overcome these difficulties, we present a series of strategies of tool mask-guided ray casting, stereo depth-cueing ray marching and stereo depth-supervised optimization. With experiments on DaVinci robotic surgery videos, our method significantly outperforms the current state-of-the-art reconstruction method for handling various complex non-rigid deformations. To our best knowledge, this is the first work leveraging neural rendering for surgical scene 3D reconstruction with remarkable potential demonstrated. Code is available at: https://github.com/med-air/EndoNeRF.

Peter Kvarda, Lukas Heisler, Nicola Krähenbühl MD et al.

Category: Ankle; Ankle Arthritis; Hindfoot; Other Introduction/Purpose: Auto-generated 3-dimensional (3D) measurements based on weightbearing cone-beam computed tomography (CT) scan technology may allow for a more accurate hind- and midfoot assessment. The current study evaluated the reliability and clinical relevance of such measurements in patients with posttraumatic end-stage ankle osteoarthritis. Methods: Seventy-two patients treated at our institution for posttraumatic end-stage ankle osteoarthritis, with available weightbearing conventional radiographs and a cone-beam CT scan, were analyzed. Twenty healthy individuals aged between 40 and 70 years served as controls. Seven variables were measured on the conventional radiographs (2D) and compared to 3D measurements that were based on reconstructions from cone-beam CT scans. The reliability of each measurement was calculated and subgroups formed according to commonly observed deformities. Results: Inter- and intraobserver reliability was superior for 3D compared to 2D measurements. The accuracy of 3D measurements performed on osteoarthritic ankles was similar to 3D measurements performed on healthy individuals. Thirty-three of the 72 included patients (46%) evidenced an inframalleolar compensation of a supramalleolar/intra-articular ankle deformity (78% = varus compensation; 22% = valgus compensation), whereas 24 of those 72 patients (33%) showed no compensation or a further increase of a supramalleolar/intra-articular ankle deformity (67% = varus deformity; 33% = valgus deformity). Conclusion: Auto-generated 3D measurements of the hind- and midfoot are reliable in both healthy individuals and patients with posttraumatic end-stage ankle osteoarthritis. Such measurements may be crucial for a detailed understanding of the location and extent of hindfoot deformities, possibly impacting decision making in the treatment of end-stage ankle osteoarthritis.

Chiranjib Chakraborty, Ashish Ranjan Sharma, Manojit Bhattacharya et al.

The infective SARS-CoV-2 is more prone to immune escape. Presently, the significant variants of SARS-CoV-2 are emerging in due course of time with substantial mutations, having the immune escape property. Simultaneously, the vaccination drive against this virus is in progress worldwide. However, vaccine evasion has been noted by some of the newly emerging variants. Our review provides an overview of the emerging variants’ immune escape and vaccine escape ability. We have illustrated a broad view related to viral evolution, variants, and immune escape ability. Subsequently, different immune escape approaches of SARS-CoV-2 have been discussed. Different innate immune escape strategies adopted by the SARS-CoV-2 has been discussed like, IFN-I production dysregulation, cytokines related immune escape, immune escape associated with dendritic cell function and macrophages, natural killer cells and neutrophils related immune escape, PRRs associated immune evasion, and NLRP3 inflammasome associated immune evasion. Simultaneously we have discussed the significant mutations related to emerging variants and immune escape, such as mutations in the RBD region (N439K, L452R, E484K, N501Y, K444R) and other parts (D614G, P681R) of the S-glycoprotein. Mutations in other locations such as NSP1, NSP3, NSP6, ORF3, and ORF8 have also been discussed. Finally, we have illustrated the emerging variants’ partial vaccine (BioNTech/Pfizer mRNA/Oxford-AstraZeneca/BBIBP-CorV/ZF2001/Moderna mRNA/Johnson & Johnson vaccine) escape ability. This review will help gain in-depth knowledge related to immune escape, antibody escape, and partial vaccine escape ability of the virus and assist in controlling the current pandemic and prepare for the next.

Yuta Nozaki, Masatoshi Sato, Masaaki Suzuki

Every homology cylinder is obtained from Jacobi diagrams by clasper surgery. The surgery map $\mathfrak{s} \colon \mathcal{A}_n^c \to Y_n\mathcal{IC}_{g,1}/Y_{n+1}$ is surjective for $n \geq 2$, and its kernel is closely related to the symmetry of Jacobi diagrams. We determine the kernel of $\mathfrak{s}$ restricted to the 1-loop part after taking a certain quotient of the target. Also, we introduce refined versions of the AS and STU relations among claspers and study the abelian group $Y_n\mathcal{IC}_{g,1}/Y_{n+2}$ for $n \geq 2$.

Jihun Yoon, Jiwon Lee, Sunghwan Heo et al.

Automated surgical instrument localization is an important technology to understand the surgical process and in order to analyze them to provide meaningful guidance during surgery or surgical index after surgery to the surgeon. We introduce a new dataset that reflects the kinematic characteristics of surgical instruments for automated surgical instrument localization of surgical videos. The hSDB(hutom Surgery DataBase)-instrument dataset consists of instrument localization information from 24 cases of laparoscopic cholecystecomy and 24 cases of robotic gastrectomy. Localization information for all instruments is provided in the form of a bounding box for object detection. To handle class imbalance problem between instruments, synthesized instruments modeled in Unity for 3D models are included as training data. Besides, for 3D instrument data, a polygon annotation is provided to enable instance segmentation of the tool. To reflect the kinematic characteristics of all instruments, they are annotated with head and body parts for laparoscopic instruments, and with head, wrist, and body parts for robotic instruments separately. Annotation data of assistive tools (specimen bag, needle, etc.) that are frequently used for surgery are also included. Moreover, we provide statistical information on the hSDB-instrument dataset and the baseline localization performances of the object detection networks trained by the MMDetection library and resulting analyses.

Yashar Zeighami, Mahsa Dadar, Justine Daoust et al.

Overweight and obese individuals tend to have increased brain age, reflecting poorer brain health likely due to grey and white matter atrophy related to obesity. However, it is unclear if older brain age associated with obesity can be reversed following weight loss and cardiometabolic health improvement. The aim of this study was to assess the impact of weight loss and cardiometabolic improvement following bariatric surgery on brain health, as measured by change in brain age estimated based on voxel-based morphometry (VBM). We used three datasets: 1) CamCAN to train the brain age prediction model, 2) Human Connectome Project to investigate whether individuals with obesity have greater brain age than individuals with normal weight, and 3) pre-surgery, as well as 4, 12, and 24 month post-surgery data from participants (n=87) who underwent a bariatric surgery to investigate whether weight loss and cardiometabolic improvement as a result of bariatric surgery lowers the brain age. Our results from the HCP dataset showed a higher brain age for individuals with obesity compared to individuals with normal weight (p<0.0001). We also found significant improvement in brain health, indicated by a decrease of 2.9 and 5.6 years in adjusted delta age at 12 and 24 months following bariatric surgery compared to baseline (p<0.0005). While the overall effect seemed to be driven by a global change across all brain regions and not from a specific region, our exploratory analysis showed lower delta age in certain brain regions at 24 months. This reduced age was also associated with post-surgery improvements in BMI, systolic/diastolic blood pressure, and HOMA-IR (p<0.05). In conclusion, these results suggest that obesity-related brain health abnormalities might be reversed by bariatric surgery-induced weight loss and widespread improvements in cardiometabolic alterations.

Dimitrios-Sokratis Komaris, Cheral Govind, Andrew James Murphy et al.

Abstract Background Dissimilar total knee arthroplasty implant designs offer different functional characteristics. This is the first work in the literature to fully assess the Columbus ultra-congruent mobile (UCR) system with a rotating platform. Methods This is a double-blinded randomised controlled trial, comparing the functional performance of the low congruent fixed (CR DD), ultra-congruent fixed (UC) and UCR Columbus Total Knee Systems. The pre-operative and post-operative functional performance of twenty-four osteoarthritic patients was evaluated against nine control participants when carrying out everyday tasks. Spatiotemporal, kinematic and kinetic gait parameters in walking and stair navigation were extracted by means of motion capture. Results The UC implant provided better post-operative function, closely followed by the UCR design. However, both the UC and UCR groups exhibited restricted post-operative sagittal RoM (walking, 52.1 ± 4.4° and 53.2 ± 6.6°, respectively), whilst patients receiving a UCR implant did not show an improvement in their tibiofemoral axial rotation despite the bearing’s mobile design (walking, CR DD 13.2 ± 4.6°, UC 15.3 ± 6.7°, UCR 13.5 ± 5.4°). Patients with a CR DD fixed bearing showed a statistically significant post-operative improvement in their sagittal RoM when walking (56.8 ± 4.6°). Conclusion It was concluded that both ultra-congruent designs in this study, the UC and UCR bearings, showed comparable functional performance and improvement after TKA surgery. The CR DD group showed the most prominent improvement in the sagittal RoM during walking. Trial registration The study is registered under the clinical trial registration number: NCT02422251 . Registered on April 21, 2015.

V. Travers

Burnout corresponds to a state of exhaustion (emotional, physical, mental) that can result in complete psychological and/or physical breakdown. Burnout is a result of how our society has evolved. A recent phenomenon, it affects all strata of society, all corporations, and all countries. Physicians are not immune to it, whether they are in public or private practice and whether they are residents in training or seasoned practitioners. The orthopedic world is particularly affected because of multiple risk factors such as sustained work demands, increased malpractice lawsuits, patients no longer placing physicians on a pedestal, greater bureaucratic demands from hospitals and large practices, institutional control policies, reduced autonomy and aggressive media. This is a highly topical issue, hence this study. We sought to answer the following questions: What is burnout? Burnout has three components: emotional exhaustion, depersonalization, loss of personal accomplishment. Its manifestations are psychological, emotional and also physical. Six psychosocial risk factors have been described. The most relevant to our specialty are the intensity and complexity of the work, and the substantial emotional requirements. What is the frequency of burnout and the risk factors in the medical field? Burnout affects the healthcare sector, especially surgeons with a mean of 40% rate. All age groups, all types of practices and all countries are impacted. The mean suicide rate among surgeons (13.3%) is double that of the general population. The primary risk factors are physical and emotional overload, growing bureaucracy, the burden of malpractice lawsuits and regulatory bodies. How does burnout impact orthopedic and trauma surgery specifically? The burnout rate has been reported to be 30% to 40%, and greater than 50% in residents. The stress level is graded at more than 8/10 in 31% of us, with 40% of practitioners deeming this current stress level unacceptable. Administrative factors and the regulatory burden are said to be the most difficult to handle; consequently, orthopedic surgeons feel the best when they are operating. How can burnout be prevented and treated? The main elements of individual and collective prevention appear to be stress management seminars where surgeons can share their experiences, hear from others in the same situation and adjust their practices. We believe the priority should be placed on managing the work time and number of patients.

Kyung-Jin Song, Jong-Hyun Ko, Tae-Young Kwon et al.

Mobarakol Islam, Lalithkumar Seenivasan, Lim Chwee Ming et al.

Learning to infer graph representations and performing spatial reasoning in a complex surgical environment can play a vital role in surgical scene understanding in robotic surgery. For this purpose, we develop an approach to generate the scene graph and predict surgical interactions between instruments and surgical region of interest (ROI) during robot-assisted surgery. We design an attention link function and integrate with a graph parsing network to recognize the surgical interactions. To embed each node with corresponding neighbouring node features, we further incorporate SageConv into the network. The scene graph generation and active edge classification mostly depend on the embedding or feature extraction of node and edge features from complex image representation. Here, we empirically demonstrate the feature extraction methods by employing label smoothing weighted loss. Smoothing the hard label can avoid the over-confident prediction of the model and enhances the feature representation learned by the penultimate layer. To obtain the graph scene label, we annotate the bounding box and the instrument-ROI interactions on the robotic scene segmentation challenge 2018 dataset with an experienced clinical expert in robotic surgery and employ it to evaluate our propositions.

İsmail Bülent Özçelik, Hüsrev Purisa, Berkan Mersa et al.

Abstract Objectives: We retrospectively evaluated replantations performed for Tamai type 1 thumb amputations.\r\nMethods: The study included 14 patients (12 males, 2 females; mean age 28 years; range 14 to 40 years) whose replanted thumbs survived following replantation for Tamai type 1 amputations in the distal nail fold of the thumb. Central digital artery anastomosis was performed in all the cases. Four patients with an appropriate vein had a single volar vein anastomosis. Nerve repair could be possible in only three patients. Sensory evaluations were made with the Semmes-Weinstein monofilament test, static and moving two-point discrimination tests, and vibration test. In addition, patients were evaluated with respect to atrophy in the replanted part, nail-bed deformities, and cold intolerance. The mean follow-up period was 11 months (range 6 to 48 months). \r\nResults: The Semmes-Weinstein test was green (range 2.83 to 3.22) in five patients (35.7%), blue (range 3.22 to 3.61) in eight patients (57.1%), and purple (range 3.84 to 4.31) in one patient (7.1%). The mean static and moving two-point discrimination test results were 6.9 mm (range 3 to 10 mm) and 4.5 mm (range 3 to 6 mm), respectively. Compared to the intact fingers, vibration was increased in six thumbs (42.9%), decreased in six thumbs, and the same in two thumbs (14.3%). Atrophy of the replanted parts was observed in five patients (35.7%). Three patients (21.4%) complained about cold intolerance, and three patients had nail-bed deformities. The mean time to return to work was 3.2 months (range 2 to 6 months).\r\nConclusion: Despite technical difficulties, thumb replantations yield good functional and aesthetic results. Sensory recovery is sufficient even after tip replantations without nerve repair. Özet Amaç: Başparmak Tamai tip 1 amputasyonlarda uygulanan replantasyonlar geriye dönük olarak değerlendirildi.\r\nÇalışma planı: Çalışmaya, başparmak tırnak yatağı distalinde meydana gelen Tamai tip 1 amputasyonlar nedeniyle replantasyon uygulanan ve tedavi sonrasında dolaşım devamı sağlanan 14 hasta (12 erkek, 2 kadın; ort. yaş 28; dağılım 14-40) alındı. Tüm hastalarda santral digital arter anastomozu yapıldı. Anastomoza uygun ven bulunabilen dört hastada birer adet volar ven anastomozu yapıldı. Sinir tamiri sadece üç hastada yapılabildi. Duyu değerlendirmesi Semmes-Weinstein testi, iki nokta ayrım testi, hareketli iki nokta ayrım testi ve vibrasyon testi ile yapıldı; ayrıca, hastalar parmak atrofisi, soğuk intoleransı ve tırnak yatağı deformiteleri açısından incelendi. Ortalama takip süresi 11 ay (dağılım 6-48) idi. \r\nSonuçlar: Semmes-Weinstein testi beş parmakta (%35.7) yeşil (dağılım 2.83-3.22), sekiz parmakta (%57.1) mavi (dağılım 3.22-3.61), bir parmakta (%7.1) mor (dağılım 3.84-4.31) idi. İki nokta ayrım testi ortalama skoru 6.9 mm (dağılım 3-11 mm), hareketli iki nokta ayrım testi ortalama skoru 4.5 mm (dağılım 3-6 mm) bulundu. Aynı elin sağlıklı parmaklarıyla karşılaştırıldığında, vibrasyon altı başparmakta (%42.9) artmış, altı başparmakta azalmış bulunurken, iki başparmağın (%14.3) vibrasyonu diğer parmaklarla eşit idi. Beş parmağın (%35.7) replante edilen kısmında atrofi; üçer hastada (%21.4) ise soğuk intoleransı ve tırnak deformitesi görüldü. Hastaların işe dönüş süreleri ortalaması 3.2 aydı (dağılım 2-6 ay).\r\nÇıkarımlar: Başparmak distal uç replantasyonları, teknik zorluklara rağmen, görünüm açısından ve fonksiyonel açıdan iyi sonuçlar vermektedir. Sinir tamiri yapılamayan olgularda da yeterli duysal iyileşme sağlanmaktadır.

Lamees A. Altamimi, Erica Kholinne, Hyojune Kim et al.

Heterotopic ossification is formation of bone in atypical extra-skeletal tissues and usually occurs spontaneously or following neurologic injury with unknown cause. We report a 46-year-old female with right shoulder pain and restricted range of motion (ROM) for 3 months without history of trauma. Magnetic resonance imaging (MRI) showed a lesion within the rotator cuff supraglenoid. Excisional biopsy from a previous institution revealed a heterotopic ossificans (HO ). Following repeat MRI and bone scan, histopathology from arthroscopic resection confirmed an HO. The patient demonstrated improved pain and ROM at follow-up. Idiopathic HO rarely occurs in the shoulder joint, and resection of HO should be delayed until maturation of the lesion to avoid recurrence. The current case showed that arthroscopic HO resection provides an excellent surgical view to ensure complete lesion removal and minimize soft tissue damage at the supraglenoid area. Furthermore, the minimally invasive procedure of arthroscopy may reduce rehabilitation time and facilitate early return to work.

Alejandro Espejo-Reina, M.D., M.Sc., María Josefa Espejo-Reina, M.D., Maximiano Lombardo-Torre, M.D. et al.

A technique for augmentation of the anterior cruciate ligament (ACL) with hamstring graft and lateral extra-articular tenodesis is presented. The patient is positioned supine with the knee flexed 90°. First, intra-articular injuries are addressed arthroscopically, and then autologous hamstring tendons are harvested and measured; the present technique is a resource for cases with a very small graft diameter (less than 8 mm), due to thin tendons or to tendon breakage, even after tripling the hamstring graft, which is prepared using a facia lata strip long enough to fit the lengths of the femoral tunnel, the anterior cruciate ligament graft, and the tibial tunnel. A single femoral tunnel is performed and only 2 interference screws are needed for fixation.

Linh Truong

We compute the knot Floer filtration induced by a cable of the meridian of a knot in the manifold obtained by large integer surgery along the knot. We give a formula in terms of the original knot Floer complex of the knot in the three-sphere. As an application, we show that a knot concordance invariant of Hom can equivalently be defined in terms of filtered maps on the Heegaard Floer homology groups induced by the two-handle attachment cobordism of surgery along a knot.