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Purpose: This study aimed to evaluate professional footwear comfort, functionality and style as well as their relationships with the foot structure among nurses. Methods: We examined 120 clinical nurses aged 40-50 years, occupationally active, wearing specific type of foot-wear at work for a minimum of 7 h a day, for 5 days prior to the research. The study relied on the CQ-ST podoscope for measurements of foot. Perception of footwear comfort, functionality and style scales were also used in the research. The results were analysed with the use of Mann-Whitney U-test and Spearman's rank correlation. Results: Statistically significant negative associations were found between right and left foot length and overall comfort of footwear ( p = 0.045, p = 0.045) as well as between right and left foot width and arch height ( p = 0.015, p = 0.028). Heel angle positively correlated with safety ( p = 0.008, p = 0.050), ease of donning and doffing ( p = 0.001, p = 0.004), as well as shoe style ratings ( p = 0.047). Variables determining shoe comfort were positively correlated with most shoe functionality characteristics as well as with shoe style (p < 0.05). Conclusions: Tested medical footwear meets the requirements of nurses in terms of comfort, functionality and aesthetics, and the studied features of footwear can be a useful guideline for the selection of shoes for representatives of this professional group. These footwear can be an element of workwear, and even, in the case of women with transverse flat feet - an alternative to ordinary utility shoes. There is a need to consider different widths for the same length size in medical footwear designs.

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BACKGROUND: This study evaluates the accuracy and readability of Google, ChatGPT-3.5, and 4.0 (two versions of an artificial intelligence model) responses to common questions regarding bunion surgery. METHODS: A Google search of "bunionectomy" was performed, and the first ten questions under "People Also Ask" were recorded. ChatGPT-3.5 and 4.0 were asked these ten questions individually, and their answers were analyzed using the Flesch-Kincaid Reading Ease and Gunning-Fog Level algorithms. RESULTS: When compared to Google, ChatGPT-3.5 and 4.0 had a larger word count with 315 ± 39 words (p < .0001) and 294 ± 39 words (p < .0001), respectively. A significant difference was found between ChatGPT-3.5 and 4.0 compared to Google using Flesch-Kincaid Reading Ease (p < .0001). CONCLUSIONS: Our findings demonstrate that ChatGPT provided significantly lengthier responses than Google and there was a significant difference in reading ease. Both platforms exceeded the seventh to eighth-grade reading level of the U.S. LEVEL OF EVIDENCE: N/A.

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Background: Hallux valgus deformity affects more than 35% of people aged ≥65 years. Surgical correction in this population can be more complicated because of poor bone quality, worse deformity, and postoperative recovery challenges. The purpose of this study was to compare the radiographic and clinical outcomes of patients aged ≥65 years who underwent either open Lapidus or minimally invasive chevron Akin osteotomy for bunion correction. Methods: A retrospective review identified 62 patients aged ≥65 years who were treated surgically for hallux valgus with at least 1-year postoperative Patient-Reported Outcomes Measurement Information System (PROMIS) scores (physical function and pain interference). Preoperative and at least 6-month postoperative radiographs were measured for the hallux valgus angle and intermetatarsal angle. PROMIS scores were obtained preoperatively and at 1 and/or 2 years postoperatively. Differences in demographic, clinical, and radiographic outcomes were assessed using the Mann Whitney U test and P values were adjusted for a false discovery rate of 5%. Results: There was no difference between the MIS and open cohorts in pre- or postoperative radiographic measurements or clinical outcomes at any time point. At 1 year postoperatively, both groups had statistically significant improvements in the PROMIS pain interference domain but only the MIS group had a statistically significant improvement in the PROMIS physical function domain. Clinical significance was equivocal. At 2 years postoperatively, there were clinically and statistically significant improvements in the PROMIS pain interference and physical function domains for the open and MIS groups. Conclusion: Patients in both surgical groups had improvement in radiographic measurements and 2-year PROMIS scores, although there was no clinical or statistical difference found between groups. MIS and open surgical techniques appear to be safe and effective in correcting hallux valgus in older patients; however, patients may need to be counseled that maximum improvement after surgery may take more than 1 year. Level of Evidence: Level III, retrospective cohort study.

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Background: There has been increasing interest in the use of percutaneous or minimally invasive osteotomy techniques for bunionette correction. The aim of this systematic review was to investigate the clinical and radiographic outcomes following percutaneous or minimally invasive surgery for bunionette deformity correction. Methods: A systematic review following PRISMA guidelines was undertaken. All clinical studies published in MEDLINE, Embase, PubMed, and the Cochrane Library Database from inception until December 2023 reporting on the use of percutaneous or minimally invasive osteotomy techniques for bunionette deformity correction were included. The primary outcome was radiographic deformity correction. A meta-analysis of clinical and radiographic outcomes was performed to assess the mean difference following surgery. Risk of bias was assessed using the ROBINS-I tool. Results: A total of 942 potential studies were identified, of which 18 were included encompassing 714 feet in 580 patients. There were no comparative studies identified. The majority of studies (n = 14/18) used an unfixed distal osteotomy technique. All studies showed a statistically significant improvement in clinical outcomes (American Orthopaedic Foot & Ankle Society ankle-hindfoot score and visual analog scale for pain) and radiologic outcomes (fourth-fifth intermetatarsal angle and fifth metatarsophalangeal angle). Complication rates ranged from 0% to 21.4%. The nonunion rate was 0% to 5.6%. Overall risk of bias was low to moderate. The most common complication was development of a hypertrophic callus that tended to resorb over time without needing further surgical intervention. Conclusion: The results of this systematic review must be considered in light of the methodologic limitations of the studies analyzed-including additional procedures performed at the same time as the bunionette correction, lack of comparative studies, and heterogeneity of the case series included. Despite these limitations, our review suggests that percutaneous techniques for bunionette deformity correction are generally clinically safe and associated with improvement in radiographic alignment and patient-reported outcome measures.

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BACKGROUND: Minimally invasive (MIS) treatment of hallux valgus (HV) deformity is increasing in popularity. A 2-mm diameter burr is used to create a distal first metatarsal osteotomy prior to capital fragment translation and fixation. The metatarsal will shorten by the burr's diameter (2 mm). Plantar or dorsal capital fragment displacement may also cause load transference and possibly transfer metatarsalgia. The purpose of this study is to examine the effect of MIS HV on forefoot loading mechanics with respect to metatarsal shortening and sagittal plane displacement. METHODS: Four lower-limb cadaveric specimens were studied. A pedobarography pressure-sensing mat was used to record forefoot plantar pressure in a controlled weight-bearing stance position. Control and postosteotomy measurements were obtained with the capital fragment fixated in 3 possible positions: 0 mm, 5 mm dorsal, and 5 mm plantar displacement. Pedobarography data yielded pressure data within measurable graphical depictions. Raw mean contact pressure measurements were taken under the first and fourth metatarsal heads to establish medial and lateral forefoot loading pressure ratios. An a priori power analysis was performed based on previous peer-reviewed pedobarographic data, and our study was adequately powered. RESULTS: Around 40 measurements were recorded, and ratios of medial-to-lateral forefoot loading were constructed. Medial forefoot pressure control versus 0 mm displacement, and control versus dorsal displacement were not found to be statistically significant (p = 0.525, p = 0.55, respectively). Medial pressure significantly increased when comparing control versus plantar displacement (P = .006). Lateral pressure significantly increased with dorsal displacement of the osteotomy (P = .013). CONCLUSION: Our study found that MIS HV correction did not cause an increase in lateral forefoot pressure loading when sagittal plane displacements were controlled. Plantar displacement increased medial loading, and dorsal displacement increased lateral loading. It may be valuable for surgeons to consider metatarsal head position postosteotomy, as a decrease in medial loading and subsequent increase in lateral loading may lead to lateral forefoot pain and transfer metatarsalgia. LEVELS OF EVIDENCE: IV.

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OBJECTIVE: Chevron osteotomy offers near-excellent clinical results and adequate stability at lower shift percentages, among the techniques used to correct hallux valgus deformity. This cadaveric study aimed to compare the Chevron osteotomy with the reverse offset-L osteotomy, which may provide a greater surface area and a more stable geometry to withstand higher cantilever forces at higher shift percentages. METHODS: Metatarsal bones obtained from 20 human cadavers with similar bone quality were divided into two groups: Chevron osteotomy was applied to the 1st group and reverse offset-L osteotomy was applied to the 2nd group. The load-to-failure, displacement in the y-axis, and total displacement values of both groups were compared statistically. Furthermore, bone densities were compared between the groups with computed tomography imaging. RESULTS: When outliers in both groups were excluded, a statistically significant difference was found in favor of reverse offset-L (143 ± 42 vs. 204 ± 51.2 N, p = 0.02) in terms of failure load. The groups were similar in terms of displacement on the y-axis and total displacement values. Bone densities were similar. CONCLUSION: The reverse offset-L osteotomy has been shown to withstand greater loads before failure compared to the standard Chevron osteotomy. This significant difference in load-to-failure may enable reverse offset-L to provide reliable stability in osteotomies performed in advanced HV cases requiring higher shifts.

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BACKGROUND: The objective of this study was to evaluate the biomechanical stability of a medially placed nitinol staple compared to two crossed-screws in the first TMT-1 joint fusion in a cadaveric cyclic loading model. METHODS: Seven matched pairs (N = 7) of lower limb cadaveric specimens were utilized. TMT-1 joints from each donor were fixed with a medially placed nitinol staple or dorsally placed two 3.5 mm partially threaded cannulated crossed-screws. Specimens were tested in a 4-point bending setting with increasing cyclic forces. RESULTS: The mean plantar gapping was not significantly different between the two groups at any loading stage below 200 N. Specimens fixed with a nitinol staple failed at a mean load of 305 ± 57 N. Conversely, those fixed with crossed-screws failed at 373 ± 86 N. (P = .09). CONCLUSION: There was no statistical difference between a medially placed nitinol staple and dorsally placed crossed-screws in failure loads and plantar gapping under cyclic loads at the TMT-1 joint, however, the staple fixation was much more variable. LEVEL OF EVIDENCE: Level V, basic science study, biomechanics.

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Surgical complications are inevitable in any surgical subspecialty. Throughout the years, many classification systems have been developed to better understand and report such complications. The aim of this systematic review is to investigate the variability and frequency of reporting terms used to describe adverse events and complications in hallux valgus reconstruction. We hypothesized that the terms used would be highly inconsistent, which further promotes a need for a standardized terminology reporting system. Studies related to hallux valgus reconstruction outcomes that met our predetermined inclusion criteria were investigated to identify and report the related adverse terms and complications. Adverse terms and complications were grouped into 9 categories. Of the 142 studies included, 376 distinct terms that described adverse events or complications related to hallux valgus reconstruction were identified. Of these, 73.4% (276/376) were mentioned only once in their respective studies. Five of 376 terms were mentioned in at least 25% of the papers, and only 2 of 376 were mentioned in at least 50%. The most frequently reported adverse events were "Recurrence," mentioned in 77 of 142 studies (54%), followed by "Nonunion," mentioned in 76 of 142 studies (53%). The most reported category was "Bone/Joint" with 135 related terms, mentioned in 135 of 376 of the papers (95.1%). The terminology used in reporting adverse events and complications in surgical hallux valgus correction was highly inconsistent and variable. This represents yet another barrier in accurate reporting of these terms, and subsequently a difficult analysis of the outcomes related to hallux valgus reconstruction. To overcome these challenges, we suggest developing a standardized terminology reporting system.Levels of Evidence: Level III; systematic review of Level III studies and above.

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BACKGROUND: Hallux valgus (HV) is a common foot deformity that manifests with increasing age, especially in women. The associated foot pain causes impaired gait and decreases quality of life. Moderate and severe HV is a deformity that is characterized by the involvement of lesser rays and requires complex surgical treatment. In this study, we attempted to develop a procedure for this condition. AIM: To analyse the treatment results of patients who underwent simultaneous surgical correction of all parts of a static forefoot deformity. METHODS: We conducted a prospective clinical trial between 2016 and 2021 in which 30 feet with moderate or severe HV associated with Tailor's bunion and metatarsalgia were surgically treated via a new method involving surgical correction of all associated problems. This method included a modified Lapidus procedure, M2M3 tarsometatarsal arthrodesis, intermetatarsal fusion of the M4 and M5 bases, and the use of an original external fixation apparatus to enhance correction power. Preoperative, postoperative, and final follow-up radiographic data and American Orthopaedic Foot and Ankle Society (AOFAS) scores were compared, and P values < 0.05 were considered to indicate statistical significance. RESULTS: The study included 28 females (93.3%) and 2 males feet (6.7%), 20 (66.7%) of whom had a moderate degree of HV and 10 (33.3%) of whom had severe deformity. M2 and M3 metatarsalgia was observed in 21 feet, and 9 feet experienced pain only at M2. The mean follow-up duration was 11 months. All patients had good correction of the HV angle [preoperative median, 36.5 degrees, interquartile range (IQR): 30-45; postoperative median, 10 degrees, IQR: 8.8-10; follow-up median, 11.5 degrees, IQR: 10-14; P < 0.01]. At follow-up, metatarsalgia was resolved in most patients (30 vs 5). There was a clinically negligible decrease in the corrected angles at the final follow-up, and the overall AOFAS score was significantly better (median, 65 points, IQR: 53.8-70; vs 80 points, IQR: 75-85; P < 0.01). CONCLUSION: The developed method showed good sustainability of correction power in a small sample of patients at the one-year follow-up. Randomized clinical trials with larger samples, as well as long-term outcome assessments, are needed in the future.

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BACKGROUND: The aim of this study was to evaluate and compare different fixation methods to achieve Tarsometatarsal joint I (TMT-1) arthrodesis in patients with hallux valgus regarding radiographic correction, complication profile, and clinical outcomes. METHODS: A systematic review and meta-analysis included primary literature results of evidence level 1 to 3 studies in German and English. Inclusion and exclusion criteria were established and applied, along with parameters suitable for comparison of data. RESULTS: 16 studies with a total of 1176 participants met the inclusion criteria for this analysis. Twelve evaluation criteria were compared among 3 fixation techniques; comprised of a screw-only, dorsomedial plating- and plantar plating cohort. There was no statistical difference in deformity correction (both intermetatarsal- and hallux valgus angle), or AOFAS score between the cohorts. The complication rate was 13% in the plantar-, 19.5% in the dorsomedial-, and 24.5% in the screw cohort. Nonunion was seen in 0.7% of participants in the plantar, 1.4% in the dorsomedial, and 5.3% in the screw group. The time until complete weightbearing correlated positively with the development of nonunion, with a coefficient of 0.376 (P = .009). Hardware removal was performed in 11.8% of patients in the dorsomedial cohort, 7.7% in the screw cohort, and 3.6% in the plantar cohort. CONCLUSION: Based on the results of meta-analysis of heterogeneous studies, plantar plating facilitated early weightbearing and patient mobilization compared to the other fixation methods, while carrying the lowest nonunion, hardware removal, and general complication risk. However, owing to the relatively small number of patients in the plantar plating group, more work is necessary to elucidate the benefits of plantar plating for a first tarsometatarsal joint arthrodesis. Development of complications appears to be largely dependent on the fixation model, rather than patient mobilization alone.Level of Evidence: 3.

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BACKGROUND: The hallux valgus deformity is made up of misaligned first metatarsal, hallux, and sesamoids. Their angular deformities are well-studied, but not their positional displacements. A few available reports claimed the proximal end of the proximal phalanx and sesamoids were not shifted medially along with the first metatarsal head. However, the general observation is otherwise. This study revisits the issue. METHODS: A radiological study of 189 feet with and without the hallux valgus deformity was carried out to analyze the first metatarsal, hallux, and sesamoid positional changes in relation to the second metatarsal and among themselves. A total of 194 X-ray images with all relevant measurements that formed the raw database for this study were submitted for online viewing and reference. RESULTS: There was a statistically significant change in the first metatarsal, hallux, and sesamoid positions of feet with hallux valgus deformity compared to normal feet. All have migrated medially but to different degrees. It was contrary to the past findings of no change in sesamoid and hallux positions. CONCLUSIONS: We agree with past findings that the metatarsus primus varus deformity is directly related to the failed medial metatarsosesamoid ligament. We also believe in the failure of the deep 1-2 transverse metatarsal ligament responsible for the sesamoid migration.

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Moderate to severe hallux valgus deformity often requires a Lapidus procedure (first-tarsometatarsal arthrodesis). Traditional methods include a dorsal approach with dorsal or medial fixation. However, studies demonstrate plantar/tension-side fixation, provides superior load to failure and fixation strength. This could improve outcomes, address comorbidities, and accelerate postoperative protocols; however, a paucity exists for patient outcomes in the literature regarding tension-side-fixation. The purpose of this study is to report the outcomes for tension-side Lapidus fixation. A retrospective analysis was performed of 81 patients who underwent tension-side-fixation Lapidus. Data collection consisted of: time to weight-bear, time to return to regular shoegear, hardware removal rate, revision rate, recurrence rate, relative metatarsal shortening, and nonunion rates. Mean patient age was 44 years old (range: 16-82). There were 65 females, and 16 males. The average time to weightbearing was 10.4 days. Time to return to regular shoegear was a mean of 6 weeks (ranging 2-10 weeks). Hardware removal rate was 1.2%. The recurrence rate was 8.6% (7 of 81 patients) and 5 of those 7 patients experienced recurrence before frontal-plane-correction was adopted by the surgeon. The revision rate was 0% and despite 8.6% recurrence, no patients were dissatisfied or requested a revisional procedure. The first-metatarsal shortening was a mean of 0.42 mm. The complications were as follows: 7% superficial dehiscence, 1.2% superficial wound infection, 0% deep infection, and 1.2% asymptomatic nonunion. This study suggests tension-side-fixation for Lapidus arthrodesis may allow for safe early return to weightbearing, early return to regular shoegear, low hardware removal rate, low revision rate, low metatarsal shortening, and low nonunion rate.

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Combined metatarsal and Akin-type proximal phalanx osteotomies represent a surgical solution for concomitant metatarso-phalangeal and inter-phalangeal hallux valgus. This retrospective observational study aimed to evaluate clinical and radiographic outcomes following combined distal linear metatarsal and Akin osteotomies. The study included 42 feet from 37 patients, with a mean follow-up of 27.1 (range 24-37) months. Mean surgical time was 16.54 ± 4.17 minutes. Pre- and postoperative clinical scores and radiological parameters were collected. Positive outcomes with a low recurrence and complications rates were reported. A statistically significant improvement in the Manchester-Oxford foot questionnaire, the EuroQol 5D-5L dimensions instrument, the visual analogue scale, the intermetatarsal angle, the hallux valgus angle, the distal metatarsal articular angle, and the interphalangeal angle correction was observed. Despite the results reported, further prospective studies are needed to identify the most suitable patients for this combined osteotomy approach.

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Minimally invasive surgery (MIS) has gained popularity for hallux valgus correction in the adult population. The advantage of reproducibility of this procedure can aid in lower operating room costs, quicker recovery, and fewer complications. The purpose of this retrospective study was to compare preoperative versus postoperative foot widths in patients that underwent MIS hallux valgus correction. The average preoperative foot width was 101.1 ± 5.67 mm and postoperatively the foot width measured at 12-month follow-up was 95.9 ± 4.92 mm, which was statistically significant (p < .001). Overall, there was a 5.03 ± 3.71% reduction in foot width, with a statistically significant linear relationship between preoperative foot width and percent change in width following the procedure (R = -0.46; p = .003). Based on our results, we can conclude that MIS bunion surgery can effectively narrow the foot postoperatively, particularly in patients with a wider forefoot, adding cosmetic benefit to the procedure.

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The use of staples has been shown to be a reasonable fixation technique to achieve stability of a first MTPJ arthrodesis. Although it has been shown to be a weaker construct than crossed screws or plate and screw combinations, their ease of insertion, low profile, and stability make them a desirable choice for first MTPJ arthrodesis fixation. However, because of this relative weakness, the question remains whether immediate weightbearing when using staples is advisable. The aim of this study is to determine whether the use of 2 nickel-titanium alloy (NITINOL) staples, placed at 90 degrees to one another is a stable enough construct to support full, immediate weightbearing following first MTPJ arthrodesis. We performed a retrospective chart review of patients undergoing first MTPJ arthrodesis by a single surgeon utilizing 2 NITINOL staples placed at 90 degrees to one another. Patients were allowed to be fully weightbearing immediately postoperatively. Forty-seven of 50 (94%) patients achieved complete radiologic consolidation of fusion at 12 weeks, with only 3 requiring revision surgery for nonunion. All of the patients requiring revision surgery for nonunion, had preoperative diagnosis of hallux abducto valgus. We concluded that the use of 2 NITINOL staples placed at 90 degrees to one another is a viable option for first MTPJ arthrodesis, and immediate weightbearing does not increase rate of nonunion or incidence of revision surgery when compared to other fixation techniques.

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First metatarsal phalangeal joint and the first Tarsometatarsal arthrodesis have both been used for deformity correction and treatment of pain and arthritis. Concomitant arthrodesis of the first metatarsophalangeal and first tarsometatarsal joints (Double First Ray Arthrodesis) has rarely been described. We surveyed 29 patients who underwent double first-ray arthrodesis for primary or revision correction of hallux valgus. A custom questionnaire was used to assess their activities of daily living and sports activity at a mean follow-up of 19.6 months (median 18.4 months). Secondary endpoints were return to activity, deformity correction, and arthrodesis healing rate. The primary outcomes showed an excellent return to activities of daily living with 96.6% of patients capable of walking as much as they liked after surgery at a normal pace. About 96.6% reported they felt that their surgery was successful, they had no pain, and the loss of motion at the joint fusion sites did not affect their ability to perform daily activities. Protected walking in a fracture boot was initiated at a mean (SD) of 9.8 (9.9) days. Return to an athletic shoe occurred at a mean (SD) of 44.2 (11.7) days. Full unrestricted activity was at a mean (SD) of 105.2 (19.3) days with 65% of the patient group reporting that their recovery was easier than expected. There was 1 nonunion and no other complications. This data set supports the hypothesis that patients undergoing double first-ray arthrodesis can return to activities of daily living and sports with and low complication rate.

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Hallux valgus (HV) is a common deformity of the foot. Its postoperative recurrence is not uncommon and is closely related to the recurrence of its underlying metatarsus primus varus (MPV) deformity. The syndesmosis procedure uses 1 to 2 intermetatarsal cerclage sutures to realign the first metatarsal and then induces a biological bonding between the 2 metatarsals to prevent the MPV deformity from recurring. This radiological study aimed to assess its effectiveness in long-term MPV and HV deformities recurrence prevention. Ninety-two feet of 51 consecutive patients had syndesmosis procedures that were prospectively followed up for more than 1 y and up to 14 y, averaging 100.5 (SD 45.2) months. Patients underwent X-ray examinations regularly at fixed intervals of their feet. We used Hardy's methods in measuring the intermetatarsal angle (IMA), hallux valgus angle (HVA), and medial sesamoid position from standing foot X-rays. More than 450 relevant X-ray and photo images were submitted as Supplementary Material for online viewing and reference. There was a significant final correction of IMA from 14.30° (SD 2.70) to 6.70° (SD 1.75) (p < .0001). There was no significant increase in IMA after the sixth postoperative month to their final follow-up endpoints, regardless of their lengths. There was a significant final correction of HVA from 31.95° (SD 7.45) to 19.1° (SD 7.45) (p < .0001). This study reconfirmed past findings that the MPV deformity could be corrected without osteotomies. Creating a syndesmosis-like intermetatarsal bonding was effective for long-term MPV recurrence prevention. Three feet had postoperative stress fracture of the second metatarsal. However, the HV deformity correction was less satisfactory, and the reasons were explained.

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BACKGROUND: Hallux valgus is a common condition with a complex etiology resulting in numerous treatment options. Recurrence of the deformity can occur following correction. Surgical technique and possibly also postoperative care play a role in reducing recurrence rates. This article highlights a postoperative surgical dressing technique which allows for semirigid support during the immediate postoperative period. METHODS: A wooden tongue depressor placed along the medial border of the hallux comprises the primary support for the dressing. The rigidity of the tongue depressor allows for the hallux to be drawn toward the depressor, encouraging neutral alignment of the hallux. Dressings are removed 2 weeks postoperatively, with new dressings applied in similar fashion and maintained in place until 6 weeks postoperatively. RESULTS: Based upon our observations, our surgical dressing technique provides sufficient support following hallux valgus correction surgery while being straightforward to replicate without the need for frequent dressing changes. The dressing materials are of negligible cost and are typically readily available. No associated wound complications have been observed. CONCLUSIONS: We present an easily replicable and affordable option for postoperative hallux valgus correction surgical dressings. LEVELS OF EVIDENCE: Level V: Expert Opinion.

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Historically, 2-dimensional radiographic study techniques have been used to classify deformity and guide treatment of hallux valgus deformities in the transverse plane. Recently, a triplanar hallux abducto valgus classification system was proposed. The key elements of this classification system are the pathologic alignments in 3 anatomic planes. The triplanar hallux abducto valgus classification system is intended to clarify the deformity and apply a triplanar anatomic algorithm for treatment. To our knowledge, this classification system has not been validated. Our objective was to assess reliability of the triplanar hallux valgus classification system. Patients with hallux abducto valgus were identified from a foot and ankle registry. Digital radiographs were assembled in a digital slide presentation. The eligibility criteria required complete radiographic studies and represented varying degrees of hallux abducto valgus. The reviewers included 3 board-certified, fellowship-trained orthopedic foot and ankle surgeons. Each reviewer independently classified the hallux abducto valgus deformity for a total of 75 observations. After an 8-week washout period, the order of the hallux abducto valgus cases was randomized in the digital slide presentation and redistributed to the reviewers. The average kappa value from 3 readers was 0.241 with 95% CI (0.093-0.374), indicating a fair agreement. The inter-reader agreement was 0.046 with 95% CI (-0.041 to 0.112), showing poor agreement between readers. Our results indicate the triplanar hallux abducto valgus is not a reliable classification system. While this is the first known triplanar hallux abducto valgus classification system, it lacks prognostic value and reliability.

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