Successful Union Research Articles

Study of nonunion fracture shaft femur in cases treated by intramedullary nailing in adults

Background: For many kinds of fractures of femoral shaft, interlocking intramedullary nailing (IMN) is regarded as the most effective definitive therapy. The aim of this work was to study and evaluate the factors that lead to nonunion fracture shaft femur in adults treated by IMN. Methods: The prospective and retrospective randomized study that carried out by 150 patients, with criteria of diaphyseal fractures shaft femur and closed fractures shaft femur. Antegrade nailing positioning the patient supine on a fracture table, skin traction was applied to the foot, that was put in a boot, the non-injured leg was positioned in hemi-lithotomy manner, abducted and flexed widely. Retrograde nailing: patient was put in supine position on fracture table with roll beneath the thigh to set the knee in a 30° flexed position, disinfect from above the iliac crest to the foot. Results: 11 cases had nonunion (7.33%), and 139 cases achieved successful union (92.67%). There was statistically significant relation between nonunion and BMI (P = 0.004), Diabetes Mellitus (DM) (P = 0.003), using Non-steroidal Anti-inflammatory Drugs (NSAIDs) (P = 0.008), there was statistically significant relation between nonunion type of fracture, nail size (reamed vs unreamed) and delayed weight bearing (p

RETHINKING THE 10% RULE: PATIENT-SPECIFIC MODELLING OF STRAIN IN DISTAL FEMUR FRACTURES

The objective of this study was to use patient-specific finite element modeling to measure the 3D interfragmentary strain environment in clinically realistic fractures. The hypothesis was that in the early post-operative period, the tissues in and around the fracture gap can tolerate a state of strain in excess of 10%, the classical limit proposed in the Perren strain theory.Eight patients (6 males, 2 females; ages 22–95 years) with distal femur fractures (OTA/AO 33-A/B/C) treated in a Level I trauma center were retrospectively identified. All were treated with lateral bridge plating. Preoperative computed tomography scans and post-operative X-rays were used to create the reduced fracture models. Patient-specific materials properties and loading conditions (20%, 60%, and 100% body weight (BW)) were applied following our published method.[1]Elements with von Mises strains >10% are shown in the 100% BW loading condition. For all three loading scenarios, as the bridge span increased, so did the maximum von Mises strain within the strain visualization region. The average gap closing (Perren) strain (mean ± SD) for all patient-specific models at each body weight (20%, 60%, and 100%) was 8.6% ± 3.9%, 25.8% ± 33.9%, and 39.3% ± 33.9%, while the corresponding max von Mises strains were 42.0% ± 29%, 110.7% ± 32.7%, and 168.4% ± 31.9%. Strains in and around the fracture gap stayed in the 2–10% range only for the lowest load application level (20% BW).Moderate loading of 60% BW and above caused gap strains that far exceeded the upper limit of the classical strain rule (<10% strain for bone healing). Since all of the included patients achieved successful unions, these findings suggest that healing of distal femur fractures may be robust to localized strains greater than 10%.

Unionization at Volkswagen in Chattanooga: A Postmortem

Declining unionization rates in the private sector have long been a major object of research across the social sciences and among students of the labor movement. Nowhere is this issue felt more acutely than in core productive sectors of the American South, where employers have beaten back nearly every significant organizing effort. These problems are epitomized by the United Autoworkers Workers’ 2014 defeat at the hands of German automaker Volkswagen in Chattanooga, Tennessee, where it failed to win an election despite management's ostensible neutrality. Though various competing explanations have been offered, I attribute the UAW's underwhelming performance principally to the union's own mistakes and shortcomings. Applying an analytical framework first proposed by Marshall Ganz, I argue that on three key measures of organizational performance—access to information, strategic capacity, and ongoing learning—the UAW fell short, ultimately sealing its fate. First, the UAW neglected to draw important lessons from its previous efforts to organize foreign-owned automakers, which often bore an uncanny resemblance to Volkswagen. Second, the UAW did not deploy its resources effectively, all but disregarding the widely held “best practices” and often displaying a more fundamental ineptitude. Finally, while successful unions adapt to changing conditions, the UAW suffered from path dependency, refusing to make necessary corrections when its pre-ordained strategy sent it veering off-course. These findings suggest, contra the dominant narrative, that the UAW bears some responsibility for its own organizing failures, with profound implications for the future of unions in the American South and beyond.

Timing is key: When does the market react to unionization efforts?

We estimate short-term capital-market effects of unionization efforts at publicly-listed firms and their subsidiaries in the United States between 2011 and 2019. Our short-horizon event study reports significant negative average cumulative abnormal returns at the public announcement of successful union election certifications. Our results suggest that, on average, the market perceives successful unionization as detrimental to future firm performance, expects unionization efforts, and mainly reacts when all uncertainty is resolved at the publicly-announced certification. Finally, we show that shareholders’ expectations regarding unionization efforts differ for firms with recurrent and rare election cases.

Abiotic and biotic factors controlling sexual reproduction in populations of Pseudo-nitzschia pungens (Bacillariophyceae)

Pseudo-nitzschia pungens is a widely distributed marine pennate diatom. Hybrid zones, regions in which two different genotypes may interbreed, are important areas for speciation and ecology, and have been reported across the globe for this species. However, sexual reproduction between differing clades in the natural environment is yet to be observed and is difficult to predict. Here we carried out experiments using two mono-clonal cultures of P. pungens from different genotypes to measure the frequency and timing of sexual reproduction across varying biotic (growth phases and cell activity potential) and abiotic conditions (nutrients, light, turbulence). We found the mating rates and number of zygotes gradually decreased from exponential to late stationary growth phases. The maximum zygote abundance observed was 1,390 cells mL−1 and the maximum mating rate was 7.1%, both which occurred during the exponential growth phase. Conversely, only 9 cells mL−1 and a maximum mating rate of 0.1% was observed during the late stationary phase. We also found the higher the relative potential cell activity (rPCA) in parent cells, as determined by the concentration of chlorophyll a per cell and the ratio of colony formation during parent cultivations, revealed higher mating rates. Furthermore, sexual events were reduced under nutrient enrichment conditions, and mating pairs and zygotes were not formed under aphotic (dark) or shaking culture conditions (150 rpm). In order to understand the sexual reproduction of Pseudo-nitzschia in the natural environment, our results highlight that it is most likely the combination of both biotic (growth phase, Chl. a content) and abiotic factors (nutrients, light, turbulence) that will determine the successful union of intraspecific populations of P. pungens in any given region.

Biomechanical Comparison of 5 Different Fixation Constructs in a Trapeziometacarpal Joint Arthrodesis Model

Trapeziometacarpal joint (TMC) arthrodesis has a high rate of nonunion. This biomechanical analysis sought to determine the stiffness of 5 fixation methods in a TMC joint arthrodesis model. Five fixation constructs were tested in a validated porcine model: crossed 1.1-mm K-wires, crossed 1.6-mm K-wires, crossed headless compression screws (HCSs), compression plating (CP), and locked compression plating (LCP). The cantilever bending stiffness was measured in abduction, adduction, flexion, and extension. Samples were loaded to failure in extension, and the mode of failure was examined. The crossed HCSs performed consistently well in all tests. Loading to failure resulted in screw pullout. In abduction and adduction, HCS and 1.6-mm K-wires were significantly stiffer than the other constructs. The mean load to failure in extension was similar in the HCS, CP, and LCP groups (304 N/mm, 311 N/mm, and 293 N/mm, respectively). There were no differences between CP and LCP in any biomechanical tests, and the mode of failure was through plate bending. The crossed 1.1-mm K-wires performed poorly in all tests. Crossed HCS displayed the greatest overall stability. Standard plating in compression mode and LCP had a similar biomechanical performance. The ideal construct stiffness required for the successful union after TMC joint arthrodesis is unknown, but HCS has the best overall biomechanical performance and, therefore, might be considered the best choice for this clinical setting.

Treatment of tibial bone defects: pilot analysis of direct medical costs between distraction osteogenesis with an Ilizarov frame and the Masquelet technique

PurposeThe cost implications of limb reconstruction techniques have not been adequately investigated. Aim of this pilot study was to compare the direct medical cost of tibial bone defects managed with distraction osteogenesis–Ilizarov method (ILF), or with Masquelet technique (MIF).MethodsData of 20 random patients treated in a single centre were analysed. Inclusion criteria included acute tibial defects, or post-debridement of nonunions with complete follow-up and successful union. The endpoint of clinical efficacy was the time-to-defect union. Comparisons were made between equally sized subgroups (ILF vs. MIF).ResultsThe average defect length was 5.6 cm (2.6–9.6 cm). The overall cost of 20 cases reached £452,974 (mean £22,339, range £13,459–£36,274). Statistically significant differences favoring the MIF were found regarding the average time-to-union; number of surgeries, of admissions and follow-up visits, as well as the mean intraoperative cost (£8857 vs. £14,087). These differences lead to significant differences of the mean cost of the overall treatment (MIF £18,131 vs. ILF £26,126). Power analysis based on these data indicated that 35 patients on each group would allow detection of a 25% difference, with an alpha value of 0.05 and probability (power) of 0.9.ConclusionsThe results and analysis presented highlight factors affecting the high financial burden, even in a best-case scenario, this type of surgery entails. Larger pivotal studies should follow to improve the cost efficiency of clinical practice.

Does the Addition of Bone Marrow Aspirate Concentrate from the Pelvis Improve Fusion Rates of Hindfoot and Ankle Arthrodesis?

Category: Ankle Arthritis; Ankle; Hindfoot Introduction/Purpose: Ankle and hindfoot arthrodesis are common interventions for degenerative and inflammatory foot and ankle conditions. These include, but are not limited to osteoarthritis, inflammatory arthritis, deformity, and instability. While we know the addition of bone graft is critical for successful union, we do not fully understand how graft selection affects union rates. Demineralized bone matrix (DBM) is commonly chosen due to its ease of availability and osteoconductive and osteoinductive properties. In our study, we aim to determine if adding BMAc, and thus osteogenic properties, to a DBM allograft improves union rates following ankle and hindfoot arthrodesis. Methods: After receiving IRB approval from our institution, we collected the records of patients who underwent arthrodesis of the hindfoot (subtalar, calcaneocuboid, talonavicular) or ankle during a 10-year time period. Patients were then divided into two groups: arthrodesis performed with the use of DBM and arthrodesis performed with DMB-BMAc. Cases using other graft options such as bulk allograft, autograft, or bone morphogenic protein (BMP) were excluded. Fusion was determined by standard radiographic and clinical criteria and CT scans were utilized in cases which fusion could not be determined. Patients were followed for a minimum of 6 months. If fusion was not complete at that time clinical and radiographic exams were performed at the 9- and 12-month period. Patients were analyzed for sucussesful arthrodesis. Complications and revisions were recorded and analyzed. Results: A total of 124 patients who met the inclusion criteria were identified. In 49 patients only DBM was utilized, and 75 patients BMC was added to the DBM. At 12 months post operatively the group utilizing only DBM had a union rate of 90% while the union rate of the BMAc/DBM had a union rate of 88% (p=0.985) There was no difference in the rate of complications between the two groups and the groups were matched in terms of age, smoking status, DM, sex and BMI. Additionally, in our cohort there was a trend toward increased non-union and complication rate in smokers, although this did not reach statistical significance. Conclusion: Ankle and hindfoot arthrodesis are a reliable treatment option for patients with specific foot and ankle pathology. Our study reports a fusion rate in line with previous studies. The addition of BMAc from the pelvis, attempting to improve the biology of the fusion site, to DBM does not seem to affect fusion rates.

Sesamoidectomy for Autografting in First Metatarsophalangeal Joint Arthrodesis

Category: Midfoot/Forefoot Introduction/Purpose: Arthrodesis of the first metatarsophalangeal (MTP) joint is a well established procedure with excellent outcomes for patients with forefoot disorders including hallux rigidus and hallux valgus Routine bone grafting is not typically required, but bone graft may be necessary in the setting of revision surgery, non-union, or erosive bone loss to encourage biologic fusion and fill bone voids. Options for bone graft include either allograft or autograft. Typical locations for autograft harvesting would include calcaneus, distal tibia, or iliac crest. Due to potential harvesting morbidity and time associated with an extra incision, allograft bone is frequently utilized. In this study, we describe the outcomes of an approach to first MTP fusion with simultaneous medial sesamoidectomy with morselizing the bone for utilization as autograft. Methods: A retrospective review of all first MTP arthrodesis cases performed by one fellowship-trained foot and ankle surgeon were identified. Operative reports and radiographs were reviewed identifying patients that underwent simultaneous medial sesamoidectomy for autograft purposes. Routine bone graft was not typically used for primary first MTP fusion. In the setting of nonunion surgery, revisions, or bone loss, autograft bone was harvested as needed to facilitate fusion. Medial sesamoidectomy was performed via the same dorsal approach without use of an additional incision. The bone was morselized and used to fill voids within the first MTP as needed. Supplemental calcaneal autograft was harvested if the harvest was not adequate (i.e. substantial bone voids). Indications for sesamoidectomy harvesting were noted. The primary outcome reviewed was fusion rate. Overall nonunion rates and patient outcomes were collected and compared between those undergoing sesamoidectomy for grafting and those undergoing standard procedure arthrodesis. Results: During the study period, 74 patients underwent first MTP arthrodesis. Of these, 20 underwent concurrent sesamoidectomy grafting with 11 requiring additional calcaneal grafting. Of the 20, 16 had prior surgeries and 4 had extensive erosive arthritis requiring grafting. Indications for the sesamoidectomy group included 5 primary cases of erosive hallux rigidus, 2 cases of hallux valgus, 3 nonunions, 3 failed Cartiva implants, 2 cases of avascular necrosis, 3 failed arthroplasties, 1 conversion bunionectomy, and 1 conversion from Keller procedure (Table 1). All 20 patients went on to successful union. In the non- sesamoidectomy group the fusion rate was 92.6% (p=0.57). All patients in the sesamoidectomy group were satisfied with their surgical outcome, and no revisions were required. Conclusion: This study found highly successful fusion rates in a potentially higher risk population (i.e. bone loss and revision cases) with the use of local autografting from the medial sesamoid. The medial sesamoid serves as a cost-effective, freely-available, successful graft material for first MTP arthrodesis that can be done quickly via the same incision, reducing potential need for other painful donor sites and the cost associated with allograft. This technique can be particularly useful in the context of revision arthrodesis, failed implants with conversion to arthrodesis, and in arthrodesis with osteoporotic bone or cases with significant erosive arthritis.

A Novel Technique for Tarsal Metatarsal Joint (TMTJ) Fusion using Calcaneal Precision Bone Graft: Reducing Morbidity Associated with Bone Graft Donor Site

Category: Midfoot/Forefoot; Basic Sciences/Biologics; Other Introduction/Purpose: TMTJ fusion has long been used as a treatment for TMTJ disease. Bone grafting has been shown to potentially improve union rates and often the iliac crest as a donor site has been used to achieve this. Indications for bone grafting include severe disease with greater bone loss and deformity, multiple joints being fused or revision surgery. In our paper we report on our experience of TMTJ fusion using localised bone grafting from either the calcaneum or cuneiform. This incorporates a novel operative technique for graft placement which increases contact area for healing and restores foot biomechanics. This may also therefore reduce non-union rate. Additionally, this localised form of bone grafting avoids the morbidity associated with iliac crest donor sites providing a better tolerated procedure. Methods: Twenty patients were included between 2016 and 2019 who underwent fusion of 39 TMTJs in total. Of these 39 joints 9 were first, 16 were second and 14 were third TMTJ. Two of the first TMTJ Fusions were revisions with double plating and bone grafting for non union. Fourteen patients had standard bone grafting and donor sites were as follows; 7 calcaneal, 1 cuneiform, 6 iliac crest. Seven patients had excision of OA joint and bone graft using precision instruments and surgery using our described technique. Locking plates were used in all twenty patients. Post-operative care included a wound check at two weeks, non-weight- bearing in a cast for 6 weeks and then weight-bearing cast for a further 6 weeks. Patients were followed up in clinic to observe radiological and clinical union. Ct scanning employed when delayed union was suspected. Complications with wound healing and infection were also recorded. Results: 15 of patients were female with a mean age of 59. 38 out of 39 fused joints went on to unite. 10 patients were initially assessed in the Specialist Limb Service (SLS) clinic with gait analysis prior to surgery. One non-union was diagnosed on CT scan in the traditional bone graft technique group. Graft was harvested from iliac crest in this case. All other graft sites resulted in fusion of the joint. All seven patients (100%) who had excision and bone graft using precision bone instruments with the new technique had union without delay. One patient underwent removal of metalware due to prominence. This was a revision double plating case. There were no wound healing problems and no postoperative infections. 80% of patients were satisfied with the results of surgery and reported improvement in quality of life. Conclusion: TMTJ fusion with looking plates remains an appropriate treatment for TMTJ disease providing high rates of successful union. Local donor site for bone grafting does not generate inferior outcomes whilst avoiding the morbidity associated with iliac crest harvesting. Additionally, this work presents a novel technique using precision bone graft instruments and cylindrical bone graft to fuse the TMTJ in the presence of OA. This technique generates increased fusion surface area and may provide better restoration of normal foot biomechanics.

Comparison of outcomes and operative course between septic and aseptic nonunion in long bones.

The treatment of nonunion of long bones is difficult particularly in the presence of infection, which often involves staged surgical management. There is limited literature to compare the post operative course and outcomes of patients treated for septic versus aseptic nonunion. Thus, the purpose of this study was to determine if a difference exists between the number of surgical procedures, time to union, and rate of successful union for these two groups. A retrospective cohort study was performed at a single tertiary care center. Patients suffering nonunion of the humerus, tibia and femur were included. Patient demographic data and characteristics of the post operative course were collected to include number and reason for repeat operations, antibiotic course, time to union, and development of a successful union. About 28 of 122 patients had septic nonunion. After diagnosis of nonunion, the septic group averaged 3.9 surgeries compared to 1.5 in the aseptic group (p < 0.001). There was no difference in the rate of successful union (79.8% versus 85.7%; p = 0.220), though the septic group took 129days longer on average for successful union. (376 versus 247; p = 0.018). Septic nonunion of long bones is associated with the need for significantly more operations as well as time to union, though union rates remain similar. The identification of infection is critical for both the appropriate treatment as well as counseling patients on the expected post operative course.

Early Outcomes of Combined Total Ankle Total Talus Replacement Using a 3D-Printed Talus Component With Hindfoot Arthrodesis.

Late-stage talar avascular necrosis (AVN) results in devascularization of the talus with osteonecrosis and subchondral collapse. A combined total ankle and total talus replacement (TATTR) with hindfoot arthrodesis may be utilized for end-stage talar AVN with tibiotalar and hindfoot joint arthritis. The purpose of this study is to evaluate the short-term outcomes of combined TATTR with hindfoot arthrodesis. Patients who underwent a combined TATTR or TTR with a hindfoot arthrodesis (subtalar with or without talonavicular arthrodesis) from 2016 to 2020 were retrospectively reviewed. Patient demographics, comorbidities, and surgical data were collected. Outcomes included the Visual Analog Scale (VAS) scores, range of motion, radiographic parameters, union rates, and complications. A total of 18 patients were reviewed. Nine patients were included with an average of 19.4 months follow-up. Significant postoperative improvements were observed in VAS scores (P < .001), ankle plantarflexion (P = .04), talocalcaneal height (P = .03), and tibiotalar alignment (P = .02). All patients achieved a successful union of their subtalar and talonavicular joints arthrodesis. There was one reoperation for a persistent varus ankle deformity. This is the first study to evaluate the clinical outcomes, radiographic outcomes, and union rate in combined TATTR with hindfoot arthrodesis. The early results demonstrated significant clinical improvement with 100% hindfoot union rate and no prosthetic failure.Level of Evidence: IV.

Treatment options in non-unions of the pelvis: A retrospective analysis of a single center experience over 12 years

BackgroundNon-unions and chronic instability of the pelvis remain rare complications after complex high velocity injuries with vertical and rotational instability of the pelvis. Treatment options are insufficiently supported by data evidence due to the rareness of this condition. Patients and methodswe conducted a single center, retrospective study of all non-unions and pelvic instabilities between 1.1.2008 and 1.1.2019, excluding fragility fractures. Patients’ characteristics, fracture patterns, procedures and outcomes with regard to developing treatment options and successful union in the follow-up were obtained. Results26 patients were included in this retrospective analysis. The mean age was 55 years (range 34–78 years). Seventy-seven percent of the patients were male. The standard procedure consisted of radical debridement of the non-union, interposition of autologous bone graft and rigid stabilization systems. Three patients were lost to follow up. In the remaining n = 23 patients (88%) consolidation of the non-union was achieved. The mean follow up was 31.3 months (range 6–144). Follow up showed that an iliolumbar fixation seems to be favorable regarding outcome and complications. DiscussionNon-union and remaining instability of the pelvic ring represent a rare complication after high grade pelvic trauma. There are only limited data regarding the incidence and the treatment regimen is based on small study populations only. Based on our findings we recommend to combine autologous bone grafts with rigid fixation systems especially for non-union of the pelvis to restore the posterior sacroiliac arch.

Locking plate osteosynthesis of scaphoid nonunion with severe bone defects: a case series

The treatment of scaphoid nonunion can be challenging with increasing defect size. We evaluated the outcome of scaphoid nonunion with a substantial bone defect treated with a multidirectional locking plate combined with cancellous bone grafting only. Thirteen patients with significant osseous defects measuring 6 mm or more suffering from primary nonunion without treatment (n = 6) or recalcitrant nonunion following Herbert screw osteosynthesis (n = 7) were treated and reviewed retrospectively. The stabilization was performed after debridement, autologous cancellous bone grafting and volar locking plate osteosynthesis. After a mean follow-up period of 12 months, 12 of the 13 patients achieved successful unions with a free range of motion and complete remittance of pain in everyday activity. The mean scapholunate angle decreased from 59.7° ± 11 to 43.9° ± 5 (effect strength d:1.7, p < 0.00001), scaphoid humpback deformity angle from 58.9° ± 8 to 45.1° ± 8 (d:1.8, p < 0.0001), whereas strength of the injured hand increased from 36.4 kg ± 10 to 42.4 kg ± 9 (d:1.4, p < 0.0001). One nonunion persisted without fragment dislocation receiving revision after 1 year. Thus, locking plate osteosynthesis with cancellous bone grafting is a valid alternative in scaphoid nonunions with extensive bone defects. Additionally, stable retention of the fragments prevents dislocation even in delayed or persistent nonunion. Further prospective studies are required to confirm these findings.

Management of periprosthetic fractures of the humerus : a systematic review.

The aim of this study was to investigate the outcome of periprosthetic fractures of the humerus and to assess the uniformity of the classifications used for these fractures (including those around elbow and/or shoulder arthroplasties) by performing a systematic review of the literature. A systematic search was conducted using the National Institute for Health and Care Excellence Healthcare Databases Advance Search. For inclusion, studies had to report clinical outcomes following the management of periprosthetic fractures of the humerus. The protocol was registered on the PROSPERO database. Overall, 40 studies were included, involving a total of 210 patients. The fractures were reported using very heterogeneous classification systems, as were the functional outcome scores. A total of 60 patients had nonoperative treatment with a 50% rate of nonunion. Fixation was undertaken in 99 patients; successful union was obtained in 93 (93%). Revision of either the humeral stem or the whole arthroplasty was reported in 79 patients with a high rate of union (n = 66; 84%), and a mean rate of complications of 29% (0% to 41%). This study highlighted a lack of uniformity in classifying these fractures and reporting the outcome of their treatment. The results may help to inform decision-making with patients, particularly about the rate of complications of nonoperative treatment. There is a need to improve the reporting of the pattern of these fractures using a uniform classification system, and the harmonization of the collection of data relating to the outcome of treatment. Based on this review, we propose a minimum dataset to be used in future studies. Cite this article: Bone Joint J2022;104-B(4):416-423.

A qualitative study exploring tactical performance determinants from the perspective of three Rugby World Cup coaches

Experiential knowledge of elite international coaches was investigated to reveal insights on successful rugby union strategies and tactics required to prevail in international competition. Three elite coaches who coached at a Rugby World Cup were interviewed using an in-depth, semi-structured approach. They were asked about specific strategies and tactics which they believed were required to be successful in an upcoming international tournament and a thematic analysis of qualitative data followed. Particular interest was paid to the influence of potential constraints and how these factors impact performance behaviours over time. The importance of an effective tactical kicking game in attacking strategies was highlighted, along with an adaptable defensive structure following a turnover. Unsuccessful performance behaviours in international rugby were reported to be connected with an irrational kicking game, a weak defensive line and losing possession off set-piece plays. These results support the need for a multidisciplinary approach, where exploring coaches’ knowledge presents an opportunity to enhance understanding across the performance analysis field. Further research is needed to complement experiential knowledge with quantitative research in rugby performance analysis.

Predictive factors for the bone union disorder of intramedullary screw fixation in proximal fifth metatarsal bone fractures.

Although intramedullary screw fixation likely leads to successful union of Jones fractures compared to that of nonoperative treatments, bony union disorder after surgical treatment remains to be elucidated. Intramedullary screw fixation was performed for the surgical treatment of proximal fifth metatarsal stress fractures in this series. Between January 2008 and December 2019, the feet of 222 patients were investigated regarding the effective factors for postoperative bony union between the normal union group and the bony union disorder group according to the patients' physical status, radiological assessment, and screw size. The mean postoperative follow-up period was 11.1months. Bone union disorder was defined as delayed union, nonunion, or a re-fracture recognized through a radiographic image. The prevalence rate of union disorders occurred in 14% (31/222) of the patients. The risk of bone union disorder significantly increased when using a small-diameter screw (odds ratio 4.81, 95% confidence interval [CI] 1.62-14.2, p = 0.004) and non-bone graft procedures (odds ratio 3.13, 95% CI 1.22-8.02, p = 0.02). Screw length, preoperative Torg's classification, or patients' physical status did not affect postoperative bony union. Approximately 14.0% of the patients in our study had postoperative bone union disorder. Small-diameter screws and non-bone graft procedures increased the risk of bone union disorder in the intramedullary screw fixation technique of fifth metatarsal bone stress fractures. Level 4, case series.

Congenital Pseudarthrosis of the Clavicle in Children: A Systematic Review.

(1) Background: Congenital pseudoarthrosis of the clavicle is a rare condition due to the failure of the union process of the ossification nuclei of the clavicle. The aim of this study was to conduct a systematic review of relevant case series about the argument to find an up-to-date base of evidence for treatment choice. (2) Methods: an electronic literature research of Ovid, MEDLINE and the Cochrane Library databases was conducted, and articles were selected based on inclusion criteria. Demographic data, clinical features, treatment options, outcomes and complications were analyzed. (3) Results: 21 articles met the inclusion criteria, showing a poor overall study quality; 231 pediatric patients (240 clavicles) were analyzed. The condition was typically right sided, showed no sex predominance and no clear predisposing factors. 156 patients underwent surgical treatment, mainly open debridement and refresh of bony ends, fixation with pin or plate and bone graft, with a successful union rate of 87.4%. The nonunion rate was significantly higher in the allograft group (44.4%, p = 0.019). (4) Conclusions: this paper presents an updated systematic review about treatment of congenital pseudoarthrosis of the clavicle. We confirm the generally satisfactory results of surgery, demonstrating that successful union is achievable in 87.4% of cases with a prevalence of 15.7% of major complications. Nonetheless our results should be interpreted with caution due to several limitations.

Revisiting Lunotriquetral Arthrodesis in Chronic Lunotriquetral Ligamentous Injuries.

Background Chronic lunotriquetral (LT) ligament tears are a source of ulnar-sided wrist pain. Left untreated, complete tears of the LT ligament may progress to a volar intercalated segment instability deformity and eventual carpal arthritis. Various treatments have been proposed, one of which is LT arthrodesis. LT arthrodesis has been criticized for high rates of nonunion frequently requiring reoperation, and therefore has largely fallen out of favor. However, our experience has been quite different from the literature. This study examines a single surgeon's experience with LT arthrodesis over a 15-year period. Methods A retrospective review of the senior author's practice over a 15-year period was performed. All adult cases of LT arthrodesis for chronic LT injuries were included. Headless compression screw and cancellous bone graft from the distal radius were used for primary arthrodesis in all cases. The primary outcome was rate of union, and secondary outcomes were time to union, secondary or salvage procedures, and range of motion. Nonparametric statistical analysis was used to calculate differences in outcomes. Results Twenty-eight patients met inclusion criteria. The median age was 45.5 (interquartile range [IQR] 35-50) years and 75% were male. The dominant hand was most commonly affected. Eighty-six percent of patients achieved union, one patient required redo arthrodesis, and one patient went on to wrist salvage. Three patients developed a pain-free pseudoarthrosis. Median time to radiographic union was 8.8 (IQR 5.9-11.9) weeks. Conclusion Despite multiple previous reports, this study demonstrates that LT arthrodesis for chronic LT injuries is a safe technique with high rates of successful union. Further comparative studies are warranted to determine the optimal treatment for chronic LT injuries.

Results of Hallux Metatarsophalangeal Joint Arthrodesis with and without Calcaneus Autograft

Category:Bunion; Midfoot/Forefoot; OtherIntroduction/Purpose:Hallux rigidus is the most common degenerative arthropathy of the foot. Primary hallux metatarsophalangeal (MTP) joint arthrodesis is the most common surgical treatment for end-stage hallux rigidus and can also be utilized for correction of hallux valgus. Though satisfaction rates following hallux MTP joint arthrodesis are very favorable, nonunion rates have been reported as high as 12%. Many surgeons use orthobiologics and/or autograft to augment arthrodeses about the foot and ankle in an effort to increase union rates. The purpose of this study is to retrospectively compare union rates of hallux MTP joint arthrodesis with and without calcaneus autograft.Methods:A query of our institution’s administrative database was performed to identify patients who underwent a primary hallux MTP joint arthrodesis between February 2016 and February 2019. We compared patients who underwent arthrodesis with and without calcaneus autograft. Surgeon preference dictated use of autograft, as some in our group routinely use graft while others do not. Patients 18 years and older who underwent a primary hallux MTP arthrodesis were included. Patients were excluded if they had radiographic evidence of significant bone loss or if allograft or biologic therapies were used. Patient charts and final radiographs were reviewed. The primary outcome was successful union of the hallux MTP joint arthrodesis. Secondary outcomes included preoperative diagnosis, type of surgical fixation and surgical complications. Data was compared using a student T-test.Results:There were 336 feet included in the final analysis, and 140 underwent hallux MTP arthrodesis with calcaneus autograft. Mean follow-up time was 14.8 weeks. Among all patients, 89.9% had a successful union. There was no difference in union rates between those who underwent arthrodesis with calcaneus autograft (87.9%) compared to without autograft (91.4%; p = 0.302). Hallux valgus was the preoperative diagnosis in 52.7% of cases followed by hallux rigidus (39.9%). The most common fixation method was a lag screw with a dorsal plate (80.5%). Painful hardware was the next most common complication (8.6%), and smoking and diagnosis of diabetes demonstrated no effect on union rates. In the autograft group, there were no complications related to the calcaneus autograft donor site.Conclusion:As orthobiologics and local bone autograft gain popularity in foot and ankle surgery, it is important to report clinical outcomes and establish evidence-based guidelines for use. In this relatively large retrospective comparison, the use of calcaneal graft was noted to be safe (no complications from graft site). However, there was no difference in union rate when comparing hallux MTP arthrodesis with and without calcaneus autograft.