scholarly journals Investigation on the Site of Coronal Deformities in Hallux Valgus

2021 ◽  
Author(s):  
Rachel Xiaoyu WEI ◽  
Violet Man-Chi KO ◽  
Elvis Chun-Sing Chui ◽  
Bruma Sai-Chuen FU ◽  
Vivian Wing-Yin HUNG ◽  
...  
Keyword(s):  
Hallux Valgus ◽  
Weight Bearing ◽  
Transverse Plane ◽  
Rotational Deformity ◽  
Rotational Malalignment ◽  
Joint Rotation ◽  
Valgus Angle ◽  
Foot Function ◽  
Coronal Rotation ◽  
The Relationship

Abstract BackgroundHallux valgus (HV) is a common foot deformity that is more prevalent in females, characterised by abnormal adduction of the first metatarsal (MT) and valgus deviation of phalanx on the transverse plane. Increasing evidence indicates that HV is more than a 2D deformity but a 3D one with rotational malalignment. Pronation deformity is seen during clinical examination for HV patients, but the exact origin of this rotational deformity is still unknown. Some attribute it first tarsometatarsal (TMT) joint rotation, while others attribute it to intra-metatarsal bony torsion. In addition, the correlation between the rotational and transverse plane deformity is inconclusive. Identifying the origin of the rotational deformity will help surgeons choose the optimal surgical procedure while also enhancing our understanding of the pathophysiology of Hallux valgus.ObjectiveThis study aims to (1) develop an objective method for measuring the first MT torsion and first TMT joint rotation; (2) investigate the exact location of the coronal deformity in HV; (3) investigate the relationship between the severity of deformity on the transverse and coronal planes as well as the correlation between deformity severity and foot function/symptoms in HV.MethodsAge-matched females with and without HV were recruited at Foot and Ankle Clinic of the Department of Orthopaedics and Traumatology. Computed tomography was conducted for all subjects with additional weight-bearing dorsal-plantar X-ray examination for HV subjects. Demographic information of all subjects was recorded, and foot function was evaluated. Intra-class correlation was used to explore the relationship between deformities on different planes and the deformity severity and functional outcomes, respectively. Independent t-test was used to compare joint rotation degrees and bone torsion degrees.ResultsHallux Valgus patients had more TMT joint rotation but not MT torsion compared to normal controls. TMT joint rotation is significantly correlated with foot functions. No relationship was found between the coronal rotation and the 1,2-intermetatarsal angle (IMA) or Hallux valgus angle (HVA) on the transverse plane.ConclusionOur results indicate that coronal deformities in HV may originate from TMT joint rotation. In addition, the severity of the TMT joint coronal rotation correlates with worse foot function; thus, multi-plane assessment and examination will be important for more precise surgical correction in the future.

scholarly journals Radiographic Recurrence of Hallux Valgus Based on Osteotomy Location

2018 ◽  
Vol 3 (3) ◽  
pp. 2473011418S0021
Author(s):  
Andrew Federer ◽  
Travis Dekker ◽  
David Tainter ◽  
Jordan Liles ◽  
Mark Easley ◽  
...  
Keyword(s):  
Hallux Valgus ◽  
Weight Bearing ◽  
Surgical Correction ◽  
P Value ◽  
Single Individual ◽  
Hallux Valgus Angle ◽  
Intermetatarsal Angle ◽  
Valgus Angle ◽  
Significant Difference

Category: Bunion Introduction/Purpose: Hallux valgus (HV) is one of the most common deformities of the foot resulting in pain and lifestyle modification of the patient. Recurrence rates of 10-47% have been documented in single individual osteotomy series. Unfortunately, surgical correction and recurrence are often defined as changes related to normal radiographs and not actually as the magnitude of correction lost with follow-up. Currently there have not been studies evaluating the percentage of recurrence of intermetatarsal angle (IMA) and hallux valgus angle (HVA). As there is substantial difference in starting IMA and HVA, as well as amount of surgical correction, our goal was to evaluate the percentage loss of correction over time comparing preoperative, initial postoperative and minimum of 2-year follow up radiographs among three different surgical correction techniques. Methods: This is a retrospective chart review study that examines the weight-bearing radiographic measurements of patients undergoing hallux valgus corrective surgery at a single institution over 5 years. Fifty-three patients were divided into first tarsometatarsal arthrodesis (i.e. Lapidus), mid-diaphyseal osteotomies (i.e. scarf), and distal metatarsal osteotomies (i.e. chevron). The preoperative, initial postoperative, and final follow up weight-bearing radiographs were measured for intermetatarsal angle (IMA) and hallux valgus angle (HVA). Primary outcome was percentage of recurrence of IMA and HVA, with the difference in angles between preoperative and initial postoperative weight-bearing films being considered 100% correction. The percentage of recurrence between initial postoperative and most recent follow up was then calculated (Figure 1A). A one-way analysis of variance (ANOVA) test and post-hoc Tukey-Kramer tests were used to compare preoperative IMA and HVA and percentage recurrence of IMA and HVA at most recent follow up. Results: There was no significant difference between Lapidus (14.3deg) and mid-diaphyseal osteotomies (12.7deg) in preoperative IMA (p-value=0.26). There was a significant difference between Lapidus (-0.3deg) and mid-diaphyseal (2.8deg) osteotomies for degree of hallux valgus recurrence as measured by IMA between initial postoperative films and final 2-year follow up (p-value=0.009). Lapidus procedure showed a greater magnitude decrease in IMA degrees from preoperation to final follow up compared to distal osteotomy (p-value=0.037) and trended toward significance compared to mid-diaphyseal (p-value=0.056). Mid-diaphyseal osteotomies (30%) showed a statistically significant higher percentage of IMA recurrence compared to Lapidus (-11%) (p-value=0.0014) (Figure 1B). When comparing percentage recurrence of HVA, distal osteotomies had a significantly smaller rate of recurrence when compared to the diaphyseal osteotomies (p-value=0.030). Conclusion: Though Lapidus and mid-diaphyseal osteotomies were performed for patients with a similar preoperative IMA, mid-diaphyseal osteotomies had a significantly higher percentage of recurrence at 2-year follow up compared to Lapidus procedures. Moreover, Lapidus procedures trended toward greater overall of IMA correction compared to mid-diaphyseal osteotomies. When either a Lapidus or mid-diaphyseal osteotomy is indicated, a Lapidus procedure may result in decreased rate of radiographic recurrence of hallux valgus at 2 years.

scholarly journals The Role of Weight-Bearing Computed Tomography Scan in Hallux Valgus

2020 ◽  
Vol 5 (4) ◽  
pp. 2473011420S0035
Author(s):  
Sreenivasulu Metikala ◽  
Karim Mahmoud Khamis ◽  
George W. Fryhofer ◽  
Samir Mehta ◽  
Daniel C. Farber
Keyword(s):  
Computed Tomography ◽  
Hallux Valgus ◽  
Weight Bearing ◽  
Roc Curves ◽  
Musculoskeletal Radiology ◽  
Valgus Angle ◽  
Medial Cuneiform ◽  
Axial Ct ◽  
Α Angle ◽  
And Control

Category: Midfoot/Forefoot; Bunion Introduction/Purpose: Hyperpronation of the 1st metatarsal in hallux valgus (HV) is poorly understood by conventional weightbearing radiography. We aimed to evaluate this parameter using weightbearing computed tomography (WBCT) and understand its association with other standard measurements. Methods: Retrospective evaluation of WBCT and weightbearing radiographs (WBXR) was performed for 20 patients with hallux valgus (HV) feet and 20 controls with no such deformity. Axial CT images of both groups were compared for 1st metatarsal pronation angle (α angle) and tibial sesamoid subluxation (TSS) grades. The hallux valgus angle (HVA), first-second intermetatarsal angle (IMA), 1st metatarsal-medial cuneiform angle (MMCA), Meary’s angle, and calcaneal pitch (CP) angle of the study and control groups were compared on both WBXR and the corresponding 2D images of WBCT. All the measurements were independently studied by a dedicated musculoskeletal radiology fellow. Results: HV group demonstrated significantly higher values for TSS grade (p < 0.001) but not for α angle (p = 0.19) compared to controls. Pearson’s correlations of the α angle, in the HV group, revealed no significant linear relationship with TSS grades, IMA and MMCA, and only a moderate positive correlation with HVA as per WBXR (r = 0.38, p = 0.014) but not by WBCT (p = 0.084). Also, α angle performed within the range of a chance (AUC 0.64, 95% CI: 0.49 to 0.66) when measured by receiver operating characteristic (ROC) curves. Conclusion: The α angle - a measure of abnormal hyperpronation of the 1st metatarsal - is an independent factor that may co- exist with other parameters in HV, but in isolation has limited diagnostic utility. ‘Abnormal’ α angles may even be observed in individuals without HV deformity. An increase in the HVA, IMA, MMCA or TSS grade is not necessarily associated with a similar increase in the α angle and hence, the severity of HV deformity may not be judged on this parameter alone. The WBCT is a reliable method to assess hyperpronation and guide physicians during surgical management. [Table: see text][Table: see text]

Effect of Akin Osteotomy on Hallux Valgus Correction After Scarf Osteotomy With Hallux Valgus Interphalangeus

2019 ◽  
Vol 40 (10) ◽  
pp. 1182-1188 ◽  
Author(s):  
Gerhard Kaufmann ◽  
Philipp Hofer ◽  
Matthias Braito ◽  
Reto Bale ◽  
David Putzer ◽  
...  
Keyword(s):  
Hallux Valgus ◽  
Weight Bearing ◽  
Level Of Evidence ◽  
Scarf Osteotomy ◽  
Loss Of Correction ◽  
Valgus Angle ◽  
Akin Osteotomy ◽  
Group A ◽  
Joint Congruity ◽  
Initial Correction

Background: Recurrence after hallux valgus correction is a relatively frequent occurrence. Little is known about the importance of initial correction on radiologic outcome. The objective of our study was to determine postoperative radiologic parameters correlating with loss of correction after scarf osteotomy and the combined scarf/akin osteotomy, respectively. Methods: Loss of correction was evaluated based on a group of 53 feet with isolated scarf osteotomy (S group) and a group of 17 feet with combined scarf and akin osteotomy (SA group) in a retrospective analysis. The intermetatarsal angle (IMA), the hallux valgus angle (HVA), the distal metatarsal articular angle (DMAA), the proximal to distal phalangeal articular angle (PDPAA), the position of the sesamoids, and joint congruity were measured in weight-bearing radiographs preoperatively and postoperatively throughout a mean follow-up of 44.8 ± 23.6 months. Results: Loss of correction was comparable between the S and the SA group ( P > .05). In contrast, we found higher loss of HVA correction in the S subgroup with a preoperative PDPAA above 8 degrees ( P = .011), whereas loss of correction in the S subgroup below 8 degrees of PDPAA was comparable to the SA group. In the S group, loss of correction showed significant correlation with postoperative IMA ( P = .015) and PDPAA ( P = .008), whereas in the SA group a correlation could be detected for IMA only ( P = .045). Conclusion: In cases with a PDPAA above 8 degrees, we recommend a combined scarf/akin osteotomy to diminish the potential for loss of correction. Level of Evidence: Level III, therapeutic, retrospective comparative series.

scholarly journals PO 18235 - New tomographic method for measuring metatarsal rotation in hallux valgus

2019 ◽  
Vol 13 (Supl 1) ◽  
pp. 52S
Author(s):  
Bruno Rodrigues de Miranda ◽  
Rui Dos Santos Barroco ◽  
Leticia Zaccaria Prates de Oliveira ◽  
Mahmoud Beerens Abdul Ghani Abdul Ghani ◽  
Antonio Candido de Paula Neto ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Hallux Valgus ◽  
Weight Bearing ◽  
Alpha Angle ◽  
Metatarsal Bone ◽  
3 Dimensional ◽  
First Metatarsal ◽  
Computed Tomography Scans ◽  
Tomographic Method ◽  
The Relationship

Introduction: Hallux valgus is a 3-dimensional deformity involving an increased intermetatarsal I/II angle and a rotational deformity of the first metatarsal bone. Kim et al. developed a method for measuring the tibial sesamoid position relative to the coronal rotation of the first metatarsal bone in computed tomography scans under simulated weight-bearing conditions. Objective: To describe a method for the topographic assessment of the correction of tibial sesamoid and metatarsal pronation using computed tomography scans under simulated weight-bearing and active toe extension. Method: We performed computed tomography under simulated weight-bearing conditions with and without active toe dorsiflexion, observing the degree of metatarsal pronation and sesamoid subluxation. For measurement purposes, we used the classifications of Kim et al. and Smith et al. Results: We observed tomographic correction, both angular and rotational, by measuring the intermetatarsal angle and tibial sesamoid position, which were confirmed by the change in the alpha angle suggested by Kim et al. Discussion: Toe extension was described as a peroneus longus tendon activation test by Klemola et al., who used this maneuver to demonstrate clinical rotational correction of hallux valgus. We described the use of a tomographic technique that followed this principle to preoperatively observe the underlying factors that may affect the rotational correction of the deformity. Conclusion: The method has the capacity for correction in various planes involving derotation of the first metatarsal bone and the relationship between such derotation and the change in sesamoid position in relation to the coronal plane of the foot.

scholarly journals Akin osteotomy as an adjunct to hallux MTPJ fusion

2017 ◽  
Vol 2 (3) ◽  
pp. 2473011417S0001
Author(s):  
Devendra Damany ◽  
Ramesh Dalwai
Keyword(s):  
Hallux Valgus ◽  
Weight Bearing ◽  
Proximal Phalanx ◽  
Plaster Cast ◽  
Lateral Border ◽  
Valgus Angle ◽  
Akin Osteotomy ◽  
Screw Position ◽  
Second Toe ◽  
Metaphyseal Region

Category: Midfoot/Forefoot, Hallux MTP fusion Introduction/Purpose: It is not uncommon to note residual valgus at the hallux interphalangeal joint when performing a hallux MTPJ fusion. On occasion, despite optimum positioning of hallux MTPJ for fusion, we found that in some cases the hallux was still abutting the second toe. We noted that these cases had either a high hallux interphalangeus valgus angle or the proximal phalanx had a shorter, concave lateral border due to eccentric wear. These two variables were difficult to correct despite optimum positioning of the hallux MTPJ. Consequently the hallux abuts the second toe causing irritation. We have used Akin osteotomy as an adjunct to hallux MTPJ fusion to address this intraoperative problem Methods: Between 2013 to 2016 this technique was utilised in 16 patients in whom residual hallux valgus interphalangeus was noted once the hallux MTPJ was stabilised in the appropriate position. We used two 4.0 mm AO cannulated partially threaded screws inserted in a crossed configuration for MTPJ fusion and a 8 mm x 90 degree varisation staple for the Akin osteotomy. The Akin osteotomy was performed in the mid to distal diaphyseal region of the proximal phalanx to avoid the screw position. Postoperatively, patients were given a toe spica plaster cast and were advised to walk in a heel weight bearing wedge shoe for six weeks. Results: Despite the osteotomy not being in the metaphyseal region, we have not encountered any immediate post-operative complications. We accept that this technique may not be suitable when using plates and screws for fusion but would be suitable for use with screws or staples. We have not encountered any postoperative complications. All hallux MTPJ joints have fused and Akin osteotomies have healed uneventfully Conclusion: This technique has not been reported before. Akin osteotomy is commonly used as an adjunct to corrective hallux valgus surgery. It is a relatively quick and reproducible technique with minimal incidence of complications. We suggest that this technique be considered when carrying out a hallux MTPJ fusion, although may not be required in all cases.

scholarly journals New screening method for hallux valgus with using smartphone

2018 ◽  
Vol 3 (3) ◽  
pp. 2473011418S0024
Author(s):  
Shibuya Hayatoshi ◽  
Tomoyuki Nakasa ◽  
Mikiya Sawa ◽  
Yusuke Tsuyuguchi ◽  
Munekazu Kanemitsu ◽  
...  
Keyword(s):  
Hallux Valgus ◽  
Weight Bearing ◽  
Screening Method ◽  
Conventional Radiography ◽  
Standing Position ◽  
Mean Value ◽  
Hallux Valgus Angle ◽  
Valgus Angle ◽  
The Mean ◽  
Anterior Knee

Category: Midfoot/Forefoot Introduction/Purpose: We developed a new screening method for hallux valgus during weight bearing using the photo-capturing function in cell phones. Methods: We compared apparent hallux valgus angles measured from photographs of people in a standing position during weight bearing, which were captured on a smartphone (smartphone Hallux Valgus Angle: SP-HVA) (Smartphone Method), with hallux valgus angles determined using conventional radiography in a standing posture during weight-bearing (X-ray HVA: XR-HVA). We evaluated 37 feet of 25 patients (5 men and 25 women) who visited our hospital. The mean age at the time of the visit was 73.9 years. In the Smartphone Method, subjects stood upright and the examiner used a smartphone to take photos of both feet from above while holding the phone at the level of the anterior knee. Results: The mean value was 36.2° for SP-HVA and 36.7° for XR-HVA; the two methods showed a statistically significant correlation (correlation coefficient of 0.86). Conclusion: Our smartphone-assisted screening method for hallux valgus was possible to make a diagnosis equivalent to conventional radiography method without radiation exposure.

scholarly journals Immediate weight-bearing after locking plate fixation of the Ludloff osteotomy

2017 ◽  
Vol 2 (3) ◽  
pp. 2473011417S0003
Author(s):  
Steven Neufeld ◽  
John Marcel
Keyword(s):  
Clinical Outcomes ◽  
Hallux Valgus ◽  
Locking Plate ◽  
Weight Bearing ◽  
Loss Of Correction ◽  
Function Index ◽  
Foot Function ◽  
Anatomic Locking Plate ◽  
Joint Arthritis ◽  
With Screws

Category: Bunion Introduction/Purpose: One of the more common and versatile osteotomies to correct moderate hallux valgus deformities is the Ludloff osteotomy. This oblique osteotomy is typically stabilized with screws and patients kept non-weight bearing until healed. Complications include malunion, nonunion and loss of correction, which can occur due to poor compliance with non- weight bearing protocols. Elderly, obese and physically weak patients can have difficulty remaining non-weight bearing. A novel anatomic-locking plate and fixation method was developed that allows immediate weight bearing after a Ludloff osteotomy. We analyzed the results of a consecutive cohort of patients who underwent a Ludloff osteotomy stabilized with this method. The cohort included all patients presenting with a moderate to severe hallux valgus deformities. Complications, radiographic & clinical outcomes were studied. Methods: In this IRB approved retrospective cohort study, we analyzed clinical & radiographic data of all Ludloff osteotomies performed between 2010 and 2015. Preoperative and postoperative data included Foot Function Index, intermetatarsal & hallux valgus angles, complications, callus formation & clinical outcomes. 395 feet in 350 patients were examined. 6 patients (2.1%) were male. 43 feet were excluded due to incomplete films and 21 were excluded due to screw fixation only; requiring restricted post- operative weightbearing protocols. Three surgeons performed the surgeries and review/analyses conducted by a senior orthopedic resident, uninvolved with the care of any of the patients. Indications included symptomatic hallux valgus deformities (intramedullary angle greater than 10°), failure of conservative treatment and normal preoperative range of motion. Exclusion criteria included 1st tarsometatarsal joint arthritis/instability, peripheral neuropathy, vascular disease and 1st metatarsophalangeal joint arthritis. Preoperative and postoperative radiographs were weightbearing. Patients discharged when comfortable in normal shoes. Results: At an average of 8 months postop (2 - 43 months), there was an average hallux valgus (HVA) correction angle correction of 7.6° (p<.0001) and intermetatarsal angle (IMA) correction of 21° from initial to final radiographs. Patients were discharged when comfortable in normal shoes. In the 15 feet (4.6%) who formed hypertrophic callus, there was loss of IMA of 2.3° (p<.0001) and HVA of 4.6° (p<.0001). Superficial wound infection or mild cellulitis was noted in 16 feet (4.9°); no deep infections. 15 (4.6%) feet had hardware removal due to prominent and/or broken screws. These were in older women with thin feet. There was only 1 nonunion & 8 mal-unions. An average foot function index (in 70 patients) of 9.5/100 indicated low pain and disability. Conclusion: The data from this large series of patients (395 osteotomies) supports the use of an immediate weight-bearing protocol for Ludloff osteotomies fixed with anatomic locking plates, including patients with osteopenic bone. All patients were allowed activities and weight bearing as tolerated during the post-operative period. There were relatively few complications including loss of correction or nonunion. Patients and surgeons can expect healing and complication rates similar to osteotomies fixed with screws and a non-weight-bearing post-operative protocol. Furthermore, because of the increased stability imparted by the anatomic locking plate, it would be a good option for revision bunion surgery.

scholarly journals Three-Dimensional Weightbearing Assessment of the First Ray in Hallux Valgus: A Case-Control Study

2019 ◽  
Vol 4 (4) ◽  
pp. 2473011419S0005
Author(s):  
Francois Lintz ◽  
Alessio Bernasconi ◽  
Celine Fernando ◽  
Matthew Welck ◽  
Cesar de Cesar Netto
Keyword(s):  
Hallux Valgus ◽  
Case Control Study ◽  
Weight Bearing ◽  
Three Dimensional ◽  
Case Control ◽  
Rotational Deformity ◽  
Intermetatarsal Angle ◽  
First Ray ◽  
3D Architecture ◽  
Control Study

Category: Bunion Introduction/Purpose: Coronal plane rotational deformity of the first ray has been implicated with the developmental pathologic process of hallux valgus (HV). Weight Bearing CT (WBCT) is an imaging technology that can support the assessment of this complex three-dimensional (3D) deformity. The objective of the study was to analyze the 3D architecture of the first ray in patients with HV when compared to controls using WBCT images and a 3D biometric algorithm analyzing the deformity in all three planes. We hypothesized that WBCT would confirm the rotational deformity in HV patients, and that the 3D algorithm would demonstrate increased specificity and sensitivity for the pathology when compared to traditional two-dimensional (2D) HV measurements such as the 1-2 intermetatarsal angle. Methods: Retrospective case-control study, ethics committee approved. Twenty-one feet of patients with clinically symptomatic HV and 20 feet of asymptomatic controls were included. Exclusion criteria applied were previous trauma or surgery affecting first ray or forefoot morphology. All patients were assessed using WBCT. First ray 3D coordinates (x, y, z) were harvested including: center-points of the heads and bases of the first and second metatarsals, center-point of the medial and lateral sesamoids, distal condyles of the proximal phalanx (PP) of the first toe, as well as the medial and lateral borders of the first metatarsal head and diaphysis. The 2D measurements (dorsoplantar 1-2 intermetatarsal (IMA) and metatarsophalangeal (MPA) angles) were obtained using digitally reconstructed radiographs (DRR). The Sesamoid Rotation Angle (SRA) was measured in the coronal plane. Using these coordinates, all 2D, 3D axes, distances, angulations and 3D biometric for HV (HV-3DB) could be calculated. Results: Mean ages were respectively 62.2y in the HV group and 48.8y in the control group (p<0.05). In 2D, the mean IMA and MPA for HV/controls were respectively 14.9/9.3 (p<0.001) and 30.1/13.1 (p<0.001). The SRA were respectively 29.1/7.1 (p<0.001). We found an almost perfect positive correlation between P1 rotation and sesamoid rotation, good correlation between IMA, MPA and SRA angles. There was poor correlation between pronation angles of the 1st phalanx and the 1st metatarsal. The 3D biometric algorithm combining IMA, MPA and SRA had a sensitivity of 95% and a specificity of 95.2% for the diagnosis of HV, compared to 90%/85.6% for the IMA and 90%/90.5% for the SRA. Conclusion: This original study confirmed our hypotheses. Weight Bearing CT efficiently analyzed the 3D architecture of the 1st ray in HV patients compared to asymptomatic controls. We concur with previous findings described in the literature concerning increased pronation of the 1st ray in HV. A novel biometric for HV using a specific multidimensional algorithm which combined IMA, HVA and SRA in a single 3D measurement, demonstrated increased sensitivity and specificity compared to the conventional 2D 1-2 intermetatarsal angle for the diagnosis of HV.

scholarly journals Multicenter Early Radiographic Outcomes of Triplanar Modified Lapidus Arthrodesis with Immediate Weight-Bearing

2018 ◽  
Vol 3 (3) ◽  
pp. 2473011418S0009
Author(s):  
Justin Ray ◽  
Jennifer Koay ◽  
Paul Dayton ◽  
Daniel Hatch ◽  
W. Bret Smith ◽  
...  
Keyword(s):  
Hallux Valgus ◽  
Weight Bearing ◽  
Valgus Deformity ◽  
Transverse Plane ◽  
Categorical Variables ◽  
Recurrence Rates ◽  
Radiographic Outcomes ◽  
Hallux Valgus Deformity

Category: Bunion Introduction/Purpose: Hallux valgus is a complex positional deformity of the first ray. Traditional correction methods for hallux valgus prioritize correction in the transverse plane based on anteroposterior (AP) radiographs. However, only addressing the transverse plane component of hallux valgus is a potential factor resulting in poor outcomes and high long-term recurrence rates ranging from 8%-78%. Recent evidence suggests that hallux valgus is a multi-planar deformity with significant contributions from the sagittal and frontal planes. The triplanar tarsometatarsal arthrodesis (modified Lapidus, Figure 1) uses a multi-planar approach to evaluate and correct the deformity associated with hallux valgus in all three anatomical planes. The purpose of this study is to investigate early radiographic outcomes and complications of triplanar tarsometatarsal (TMT) arthrodesis with immediate weight-bearing. Methods: After receiving IRB approval, radiographs and charts were retrospectively reviewed for 101 patients (age 41.9 ± 17.9 years) undergoing triplanar tarsometatarsal arthrodesis (modified Lapidus) for hallux valgus deformity correction at four institutions between June 2016 and June 2017. Patients were allowed immediate weight-bearing as tolerated after the procedure. Radiographic imaging at 4 months and 12 months was reviewed and compared to pre-operative imaging. Radiographic measures included hallux valgus angle (HVA), intermetatarsal angle (IMA), tibial sesamoid position (TSP), metatarsus adductus angle, evidence of metatarsal pronation, and radiographic first TMT union. Demographics included age, gender, body mass index, medical comorbidities, and smoking status. Time (days) to weight-bearing, wearing athletic shoes, and return to full activity were also noted. Any complications were recorded. For statistical analysis, t-tests were performed for continuous variables and chi-square tests were performed for categorical variables using JMP 11.0.0 (SAS Institute Inc., Cary, NC). Results: Radiographic results demonstrated significant improvements in IMA, HVA, and TSP at final follow-up. IMA was 5.9 ± 3.2 degrees at final follow-up compared to 15.0 ± 3.1 degrees pre-operatively (p < 0.001). At final follow-up, HVA was 8.3 ± 5.5 degrees compared to 23.7 ± 10.1 degrees pre-operatively (p < 0.001). TSP was also significantly improved at final follow-up (2.0 ± 0.9) compared to pre-operatively (5.1 ± 1.2; p < 0.001). Lateral round sign was present in 5 patients (4.9%) at final follow-up compared to 88 patients (87.1%) prior to corrective surgery. Four patients (4.0%) demonstrated evidence of radiographic non-union at final follow-up. Regarding complications, there were four cases (3.9%) of hardware removal for either soft-tissue irritation or hardware failure. Conclusion: In this study, early radiographic outcomes of triplanar tarsometatarsal arthrodesis (modified Lapidus) with immediate weight-bearing were promising with low complication rates. These results demonstrate that this procedure is able to reliably achieve anatomic correction in all three planes for hallux valgus deformity. The triplanar tarsometatarsal arthrodesis technique also demonstrated high union rates and low recurrence rates at final follow-up. Longer follow-up is necessary to determine the long-term survivorship, outcomes, and complications of this new technique to correct hallux valgus deformity.

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