Sesamoid Position Research Articles

Clinical and Radiographic Outcomes of Minimally Invasive Chevron Bunionectomy Compared to the Modified Lapidus Procedure

Category:Bunion; Midfoot/ForefootIntroduction/Purpose:Minimally invasive bunion surgery is relatively new in the United States, with the requisite burrs only approved for use by the FDA in 2017. Early reports on outcomes have been encouraging. However, no study to date has compared outcomes from the minimally invasive chevron and Akin procedures (MICA) to the modified Lapidus procedure. Our goal was to compare clinical and radiographic outcomes of MICA to those of the modified Lapidus procedure in patients with comparable deformities. We hypothesized that radiographic parameters of hallux valgus would be superior in the Lapidus group, but that there would be no significant difference in clinical outcomes or satisfaction between the two groups.Methods:Patients were retrospectively reviewed for inclusion from a prospectively-collected foot and ankle registry at our institution. Patients were eligible if they underwent either the MICA or modified Lapidus procedure, were 18 years or older, and had preoperative and minimum 5 month postoperative weightbearing radiographs. Exclusion criteria included prior forefoot surgery, additional surgeries (such as metatarsal shortening), and concomitant foot conditions (such as flatfoot deformity). Each surgery was performed by one of six fellowship-trained orthopedic foot and ankle surgeons. Demographics, PROMIS scores, and satisfaction data were collected from the registry. Complications and reoperations were collected from chart review. The hallux valgus angle (HVA), intermetatarsal angle (IMA), and tibial sesamoid position (SP) were measured pre- and postoperatively.Patients in the MICA group were matched to patients who underwent Lapidus bunionectomy based on radiographic parameters. Differences between the groups were assessed with paired t-tests for continuous variables and chi-square tests for categorical variables.Results:41 patients who underwent MICA and 81 patients who underwent Lapidus bunionectomy met the inclusion criteria. Of the Lapidus patients, 41 were included, matched to the MICA patients. There were no significant differences in demographics or preoperative parameters between groups aside from sex (Table). Both groups achieved similar radiographic correction (Table). Bunion recurrence (HVA >=20°) occurred in one MICA patient and two Lapidus patients, with all patients asymptomatic. The most common reason for reoperation was removal of hardware (4 patients in the MICA group, 2 patients in the Lapidus group). One additional patient in the MICA group required reoperation for wound closure, and one additional patient in the Lapidus group required a derotational proximal phalanx osteotomy.Conclusion:This is the first study to our knowledge to compare outcomes between MICA and the modified Lapidus procedure in patients matched for bunion severity. We found that patients with similar preoperative deformities experience similar radiographic outcomes following MICA versus modified Lapidus bunionectomy. Our analysis of PROMIS scores and satisfaction data is currently underway. Although this is short-term data, it provides additional support for minimally invasive techniques which allow for faster, less painful recoveries. Further research is needed to investigate longer term outcomes and to establish which deformities are best suited to each procedure.

Minimally Invasive Surgery for Severe Hallux Valgus with Severe Metatarsus Adductus: Case Reports

Category:Bunion; Lesser ToesIntroduction/Purpose:Metatarsus adductus (MA) is a congenital transverse plane deformity with an incidence of approximately 30% in patients with hallux valgus. Operative treatment of hallux valgus (HV) with MA can be clinically challenging, and the recurrence rate of HV has been reported as two times higher than in patients without MA. Minimally invasive surgery (MIS) for the correction of HV is growing in popularity; however, only one study has been published on MIS for HV with MA using percutaneous proximal metatarsal osteotomy. We presented our case reports using distal oblique metatarsal minimal invasive osteotomy (DOMMO) for severe MA.Methods:We corrected two feet using DOMMO for severe MA. Minimally invasive chevron Akin osteotomy (MICA) was utilized to correct severe HV. The patient had subluxations in the second and third metatarsophalangeal joints and hammer toe deformities. Therefore, those deformities were concurrently corrected using percutaneous procedures. The patient was allowed immediate full weight bearing postoperatively in a flat rigid shoe for 6 weeks. Radiographic and clinical evaluations were performed preoperatively and one year after surgery. On the anteroposterior radiograph, the hallux valgus angles (HVA), the first intermetatarsal angles (IMA), tibial sesamoid positions (TSP) and metatarsus adductusangles (MAA) were evaluated. On the lateral weight-bearing radiograph, first metatarsal inclination angles were also evaluated. We also evaluate the Japanese Society for Surgery of the Foot (JSSF) hallux and lesser toes scales and the Self-Administered Foot Evaluation Questionnaire (SAFE-Q) both before and after MIS for HV with MA.Results:In the first case, the HVA improved from 50° to 16°, the IMA from 15° to 11°, TSP from 7 to 5 using Hardy's classification, and MAA from 27° to 14.5°, pre- to postoperatively. In the second case, the HVA improved from 45° to 11°, the IMA from 10° to 6.5°, TSP from grade 7 to 3, MAA from 30 to 12, pre- to postoperatively. The first metatarsal inclination angles changed from 16.9° and 18.8° to17.7° and 22.0°, respectively. All subluxations and hammer toe deformities were resolved. Although there were delayed unions in the lesser metatarsals, unions were achieved finally. Preoperative JSSF hallux scales and lesser toes scales were 59 points and 64 points, 67 points and 80 points, respectively. Both hallux and lesser toe scales improved to 100 points one year after surgery. All SAFE-Q subscores were also improved one year after surgery.Conclusion:In conclusion, our MIS procedure, consisting of DOMMO of the second, third, and fourth metatarsals and MICA, could correct severe HV with severe MA. The patient was allowed immediate full weight bearing postoperatively in a flat rigid shoe. Although there were delayed unions in lesser metatarsals, unions were finally achieved and good results were demonstrated both radiographically and clinically.

Comparing Open vs Minimally Invasive Techniques for the Correction of Hallux Valgus: Clinical and Patient Reported Outcomes

Category:BunionIntroduction/Purpose:Multiple operative techniques have been developed for hallux valgus with varying success. While correction has been traditionally achieved through open surgical approaches, there has been a growing interest in minimally invasive surgical (MIS) techniques. The purpose of this study was to compare clinical and patient-reported outcomes for patients undergoing hallux valgus correction with Lapidus, Scarf and MIS. Our hypothesis was that while a superior clinical correction would be achieved with open techniques there would be similar patient-reported outcomes among open and MIS techniques.Methods:A total of 257 patients who underwent Lapidus (n=82), Scarf (n=82) or MIS (n=93) hallux valgus correction between January 2017- January 2020 at one of two academic institutions by 1 of 9 foot and ankle-fellowship trained orthopedic surgeons were included in this study. Only 3 of 9 performed MIS correction. The average age at the time of surgery 55.4 (range 14-79). Patients were required to have a minimum baseline and 1-year postoperative Patient-Reported Outcomes Measurement Information Scores (PROMIS) and minimum 3-month clinical follow-up. Retrospective chart review was performed to assess the incidence of postoperative complications and reoperations, with an average clinical follow-up of 8 months.Results:All groups had statistically significant differences between pre- and post-operative measurements of HVA, IMA, DMAA, and tibial sesamoid position (<0.05). In addition, the Lapidus group demonstrated change in all parameters measured including Meary's angle, sagittal IMA and Seiberg index. All groups had statistically significant improvement in the PROMIS physical function, pain interference, and global health physical at 1 year (p<0.05). The Lapidus group had significant improvement in all 6 PROMIS domains measured. There were no significant differences in PROMIS score changes from pre to post-op for any PROMIS domain when comparing MIS vs Scarf vs Lapidus. Complications: Minor Complications were classified as infection, symptomatic hardware, delayed union, nerve irritation, transfer metatarsalgia (Lapidus n=14 (17.1%), Scarf n=2 (2.4%), MIS n=15 (16.1%)). Major complications were classified as nonunion, recurrence, hallux varus, recurrence (HVA >20) (Lapidus n=7 (8.5%), Scarf n=9 (11.0%), MIS n=9 (9.7%)).Conclusion:In the last decade, there has been a growing interest in the use of minimally invasive surgical MIS techniques for the treatment of hallux valgus. When compared with traditional open techniques using Lapidus and Scarf osteotomies MIS presents a safe and effective approach to treating hallux valgus.

Outcomes of Minimally Invasive Proximal Chevron Metatarsal Osteotomy for Moderate to Severe Hallux Valgus Deformity

Category:Midfoot/ForefootIntroduction/Purpose:The effectiveness of minimally invasive surgery (MIS)-distal chevron metatarsal osteotomy (DCMO) for the correction of moderate to severe hallux valgus deformity is unclear. Traditionally, proximal chevron metatarsal osteotomy (PCMO) has been considered a reliable procedure for correcting severe hallux valgus deformity. This study aimed to clarify the clinicoradiographic outcomes of our novel MIS-PCMO technique and compared its outcomes to those of MIS-DCMO performed during the same timeframe. We addressed the following research questions: (1) can the MIS-PCMO technique be an effective option for correcting moderate to severe hallux valgus deformity?; (2) are there differences in the extent of deformity correction possible with MIS-PCMO and MIS-DCMO?; and (3) what points should be considered before performing the MIS-PCMO technique?Methods:We prospectively compared the outcomes of patients who underwent MIS-PCMO (n=20 patients; 22 surgeries) and those of patients who underwent MIS-DCMO (n=23 patients; 26 surgeries) for moderate to severe hallux valgus deformity (hallux valgus angle [HVA] >=30o) between January 2017 and December 2018. The minimum follow-up duration for inclusion in this study was 18 months. The HVA, first-to-second intermetatarsal angle (IMA), distal metatarsal articular angle (DMAA), relative length of the second metatarsal, medial sesamoid position, and Meary angle were measured preoperatively and at the final follow- up.Results:Compared to MIS-DCMO, MIS-PCMO resulted in significantly greater correction of the HVA (P<0.001) and IMA (P=0.01), along with Meary angle improvement (P<0.001); however, the DMAA worsened (P=0.01). Furthermore, there was a significantly greater change in the relative second metatarsal length in the MIS-DCMO group (P=0.01). There were no significant between-group differences in the correction of the medial sesamoid position (P=0.445).Conclusion:MIS-PCMO can be a better option for correcting moderate to severe hallux valgus deformities than MIS-DCMO. However, this technique should be applied carefully when the preoperative DMAA is already large because the DMAA can become worse postoperatively.

Radiographic and Clinical Results of Minimally Invasive Chevron Akin Osteotomy for Moderate to Severe Hallux Valgus Deformities

Category:BunionIntroduction/Purpose:Some authors reported the results from the third-generation minimally invasive chevron Akin osteotomy (MICA) to treat mild to moderate hallux valgus recently. However, there have been few studies evaluating the results of MICA for moderate to severe hallux valgus. The purpose of this study was to evaluate the radiographic and clinical results of MICA for correction of moderate to severe hallux valgus.Methods:A prospective review of 30 patients (40 feet) that underwent MICA for moderate to severe hallux valgus was conducted. The 28 feet (70%) were classified as severe deformity (hallux valgus angle (HVA) >= 40°and/or first intermetatarsal angle (IMA) >= 18°). Mean followup was 18.6 months. On the anteroposterior weightbearing radiographs, HVA, IMA, lateral shape of metatarsal head (round sign), tibial sesamoid position, and first metatarsal shortening were measured. On the lateral weightbearing radiographs, inclination angle of first metatarsal was measured. American Orthopaedic Foot & Ankle Society hallux metatarsophalangeal-interphalangeal (AOFAS) scores and Self-Administered Foot Evaluation Questionnaire (SAFE-Q) were evaluated preoperatively and at the most recent follow-up.Results:Mean HVA reduced from 39.3° to 12.8°and mean IMA reduced from 18.6° to 8.4° postoperatively. Incidence of positive round sign of metatarsal head reduced from 57.5% to 5%. Tibial sesamoid position improved from 6.7 to 4.7 using Hardy's classification. Average first metatarsal shortening was 2.8mm. Inclination angle did not changed significantly, from 20.5°to 21.1°. Mean AOFAS score improved from 65.3 points to 97.9 points. All SAFE-Q subscores also significantly improved postoperatively. There were 5 complications required surgeries: 2 metatarsal screw removals and 3 bone eminence resections. There were some other complications including 3 under-correction cases and one numbness for at least 6 months.Conclusion:MICA could improve moderate to severe hallux valgus both radiographically and clinically. Accordingly, our results suggest that this procedure provides an effective means of correcting hallux valgus regardless of severity of deformity.

Influence of sesamoid position after scarf osteotomy for hallux valgus on patient-reported outcome. A prospective cohor study

BackgroundThe objective was to evaluate the influence of the postoperative sesamoid position as measured with conventional radiographs on the patient-reported outcome after scarf osteotomy. The hypothesis was that incomplete reduction of the sesamoid would result in a decreased functional outcome. MethodsEighty-two patients who underwent scarf osteotomy for hallux valgus were prospectively assessed for up to two postoperative years. The Self-Reported Foot and Ankle Score (SEFAS) was used to assess the quality of life, and the American Orthopaedic Foot and Ankle Society Hallux Metatarsophalangeal-Interphalangeal Scale (AOFAS) for the functional outcome. A visual analogue scale (VAS) assessed pain, and Likert scale for patient satisfaction. Radiologically, hallux valgus angle (HVA), first-second intermetatarsal angle (IMA), and sesamoid position were analyzed. According to the final sesamoid position, patients were classified as normal position (48 patients) and outlier position (34 patients). A power analysis, conventional and logistic regression statistical analysis were performed. ResultsAt the final follow-up, significant improvements in all clinical scores were observed for both groups (p = 0.001) with no significant difference in AOFAS score (p = 0.413), but SEFAS score (p = 0.023), VAS-pain (p = 0.006), and satisfaction (p = 0.014) were significantly better in the normal group than in the outlier group. There were significant differences between groups in final HVA (p = 0.042) and IMA (p = 0.040). In multivariate analysis, only lower VAS-pain score (OR 0.4, 95% CI 0.2–0.6; p = 0.039) and normal sesamoid position (OR 2.4, 95% CI 1.6–3.2; p = 0.012) were significant predictor of patient satisfaction. ConclusionAt two postoperative years, normal sesamoid position as measured on weight-bearing radiographs was associated with lower pain and better patient satisfaction in patients underwent scarf osteotomy for moderate to severe hallux valgus.

The Association of Crista Volume With Sesamoid Position as Measured From 3D Reconstructions of Weightbearing CT Scans.

Malposition of the sesamoids relative to the first metatarsal head may relate to intersesamoid crista underdevelopment or erosion. Using 3-dimensional models created from weightbearing CT (WBCT) scans, the current work examined crista volume and its relationship to first metatarsal pronation and sesamoid station. Thirty-eight hallux valgus (HV) patients and 10 normal subjects underwent weightbearing or simulated WBCT imaging. The crista was outlined by the inferior articular surface, and a line was drawn to connect the lowest point of each sulcus on either side of the intersesamoidal crista throughout the length of the crista. The volume was calculated. Sesamoid station and first metatarsal pronation were calculated from the 3D reconstructions. The mean crista volumes between HV and normal patients were statistically compared, as were the crista volume and pronation angle between sesamoid stations. The mean crista volume in HV patients was 80.10 ± 35 mm3 and in normal subjects was 150.64 ± 24 mm3, which differed significantly between the 2 groups (P < .001). Mean crista volumes were found to be statistically significantly different between the sesamoid stations (P < .001) with decreasing crista volumes significantly and strongly correlated with increasing sesamoid station (r = -0.80, P < .001). There was no difference in the mean pronation angle between the 4 sesamoid stations (P = .37). The pronation angle was not associated with crista volume (P = .52). HV patients have lower mean crista volume than normal patients. Crista volume is correlated with sesamoid station. Pronation of the first metatarsal was not associated with crista volume. Crista volume may offer an additional determinant for the severity of hallux valgus.

Prevalence and Predisposing Factors for Recurrence after Hallux Valgus Surgery: A Systematic Review and Meta-Analysis.

Recurrence is a frequent and undesirable outcome after hallux valgus (HV) surgery. However, the prevalence of HV recurrence and the pre- and postoperatory factors associated with it have not been adequately studied. This study aimed to quantify the prevalence rate of HV recurrence and to analyze its predisposing factors. MEDLINE and EMBASE databases were systematically searched for observational studies including individuals undergoing HV surgical correction. The random-effects restricted maximum likelihood model was used to estimate the pooled effect size (correlation coefficient (r)). Twenty-three studies were included, yielding a total of 2914 individuals. Pooled prevalence of HV recurrence was 24.86% (95% confidence interval (CI), 19.15 to 30.57, I2 = 91.92%, p = 0.00). Preoperative HV angle (HVA) (r = 0.29; 95% CI, 0.14 to 0.43) and preoperative intermetatarsal angle (IMA) (r = 0.13; 95% CI, 0.00 to 0.27) showed a moderate positive relationship with recurrence. Postoperative HVA (r = 0.57; 95% CI, 0.21 to 0.94) and sesamoid position (r = 0.46; 95% CI, 0.31 to 0.60) showed strong relationships with recurrence. In conclusion, preoperative HVA, IMA, and postoperative HVA and sesamoid position are significant risk factors for HV recurrence, and the association of these factors with recurrence is affected by age.

Multivariate Analysis of Hallux Valgus Radiographic Parameters

This investigation aimed to better understand the complex relationship of common radiographic measurements performed during the perioperative evaluation of the hallux valgus deformity while accounting for interactions and potential interdependence. Several analyses utilizing the first intermetatarsal angle, hallux valgus angle, tibial sesamoid position, Engel's angle, subject age and subject gender were performed with varying independent and dependent variables. The hallux valgus angle (p < .001), tibial sesamoid position (p < .001), and Engel's angle (p < .001) were found to be independently associated with the first intermetatarsal angle. The first intermetatarsal angle (p < .001), tibial sesamoid position (p < .001), and Engel's angle (p < .001) were found to be independently associated with the hallux valgus angle. This suggests that there is significant interdependence of these variables during a preoperative radiographic examination. However, only the change in tibial sesamoid position (p < .001) was found to be independently associated with the change in the first intermetatarsal angle following surgical correction, while no studied variables were found to be independently associated with the change in hallux valgus angle following surgical correction. This suggests that correction of the intermetatarsal angle and tibial sesamoid position might not always reliably predict correction of the hallux valgus angle following surgical intervention. It might also suggest that additional procedures beyond metatarsal osteotomies are required to reliably correct the hallux valgus angle in some deformities. It is hoped that this investigation adds to the body of knowledge with respect to the perioperative radiographic evaluation of the hallux valgus deformity.

Bösch osteotomy for hallux valgus correction: results at a mean 10-year follow-up.

Bösch osteotomy (BO), which is a first metatarsal subcapital osteotomy stabilised with a K-wire, is a surgical option to correct hallux valgus (HV). The aim of this study was to assess the long-term clinical and radiographic results in a cohort of patients treated at our institution with such osteotomy. In this retrospective monocentric single-surgeon cohort study, we included 58 HVs (46 patients) who underwent HV correction by BO and were followed at a minimum of 7years. The range of motion (ROM), the American Orthopaedic Foot and Ankle Society's Forefoot scale (AOFAS-FS) and the Visual Analogic Scale (VAS) for pain were recorded. On weightbearing radiographs, the Hallux Valgus Angle (HVA), Intermetatarsal Angle (IMA), the Distal Metatarsal Articular Angle (DMAA), and the Lateral Sesamoid Position (LSP) were measured and compared with pre-operative values. The complication rate and first metatarsophalangeal joint stiffness were also assessed. At a mean follow-up of 10 ± 2 (7-17) years, mean ± standard deviation AOFAS-FS and VAS were 89 ± 11 (67-93) and 2.1 ± 2.8 (0-7) points, respectively. In 42 (72%) cases there was no limitation in the choice of footwears. Radiographically, we found a significant improvement in the HVA (from 33.9° ± 6.7 to 18.8° ± 5.6, p < 0.001), in the IMA (14.2° ± 3.1 to 9.4° ± 2.7, p < 0.001), in the DMAA (from 30.3° ± 6.8 to 11.5° ± 5.1, p < 0.001) and in LSP (median value from 3 to 1, p < 0.001). In 36 (62%) cases the ROM was greater than 75° while in 22 (38%) it ranged between 30° and 75°. Minor complications occurred in six (10%) cases, which did not require any further surgery at the longest follow-up. Bösch technique provided satisfactory clinical and radiographic outcomes in the treatment of hallux valgus which persisted at a mean 10-year follow-up. The complication rate did not differ from more recent techniques described in literature. Level IV, retrospective cohort study.

The Effect of Hallux Valgus Surgery on the Transverse Plane Hallux Proximal Phalanx Position

The objective of this investigation was to evaluate the apparent movement of the hallux proximal phalanx in the transverse plane relative to the second metatarsal following hallux valgus surgery. Pre- and postoperative radiographs of a consecutive series of 45 feet undergoing hallux valgus surgery were analyzed. Significant improvements were observed in the first intermetatarsal angle (12.4 vs 7.5 degrees; p < .001), hallux valgus angle (24.3 vs 13.4 degrees; p < .001), tibial sesamoid position (4.6 vs 2.7; p < .001), and second metatarsal-hallux proximal phalanx angle (80.1 vs 84.6 degrees; p < .001). No difference was observed in the distance between the second metatarsal bisection and the medial aspect of the tibial sesamoid (31.7 vs 31.5 mm; p = .756) nor between the second metatarsal bisection and medial aspect of the hallux proximal phalanx base (34.6 vs 34.2 mm; p = .592). Significant differences were observed between the second metatarsal bisection and the central aspect of hallux proximal phalanx base (26.5 vs 23.9 mm; p < .001) and between the second metatarsal bisection and the lateral aspect of the hallux proximal phalanx base (19.3 vs 15.4 mm; p < .001). A statistically significant difference was observed in the change of distance between the second metatarsal bisection and the medial, central, and lateral aspects of the hallux proximal phalanx base (-0.4 vs -2.6 vs -3.9 mm; p = .002). These results indicate that the hallux proximal phalanx does not translocate in the transverse plane following hallux valgus surgery, but instead pivots about the medial aspect of the joint.

Outcomes of Scarf and Akin Osteotomy with Intra-Articular Stepwise Lateral Soft Tissue Release for Correcting Hallux Valgus Deformity in Rheumatoid Arthritis.

Background. The effectiveness of scarf and Akin osteotomy with intra-articular lateral soft tissue release for the correction of hallux valgus (HV) in patients with rheumatoid arthritis (RA) has not been elucidated. Methods. A total of 36 feet in 28 patients with RA who had scarf and Akin osteotomy with intra-articular stepwise lateral soft tissue release between 2015 and 2020 at a single institute were investigated retrospectively, with a mean follow-up period of 32.0 ± 16.9 months. Radiographic evaluations including the HV angle, intermetatarsal angle, and sesamoid position were performed preoperatively and postoperatively. Clinical outcomes were assessed using the Japanese Society of Surgery of the Foot (JSSF) hallux scale and self-administered foot evaluation questionnaire (SAFE-Q). Results. The procedure resulted in significant HV correction, with a recurrence rate of 13.9%. The JSSF scale and all five SAFE-Q subscale scores significantly improved (p < 0.05), with no major complications. More than 90% of cases achieved adequate lateral soft tissue release without sacrificing the adductor tendon of the hallux. Conclusions. Intra-articular stepwise lateral soft tissue release in combination with scarf and Akin osteotomy provided satisfactory radiographic and patient-reported outcomes for the correction of HV in patients with RA with minimum lateral soft tissue release.

Radiographic and Clinical Results of Minimally Invasive Chevron Akin Osteotomy for Moderate to Severe Hallux Valgus Deformities.

Few studies have reported results of minimally invasive chevron Akin osteotomy (MICA) for moderate to severe hallux valgus correction. This study aims to evaluate MICA for moderate to severe hallux valgus radiographically and clinically. Forty feet were prospectively reviewed. Twenty-eight feet (70%) had a severe deformity (hallux valgus angle (HVA) ≥40° and/or first intermetatarsal angle (IMA) ≥18°). We measured HVA, IMA, lateral shape of the metatarsal head (round sign), tibial sesamoid position, first metatarsal shortening on anteroposterior weightbearing radiographs, and inclination angle of first metatarsal on lateral weightbearing radiographs. We evaluated the Japanese Society for Surgery of the Foot hallux scale and Self-Administered Foot Evaluation Questionnaire responses preoperatively and at the most recent follow-up. All measurements except shortening and inclination angle improved significantly. Both clinical scale and all subscores significantly improved. MICA improved moderate to severe hallux valgus both radiographically and clinically.Level of Evidence: Level IV: case series.

Combination of Modified Scarf Osteotomy and Metatarsal Shortening Offset Osteotomy for Rheumatoid Forefoot Deformity.

With the progress of medical treatment for rheumatoid arthritis (RA), several joint-preserving forefoot surgical procedures have been established and performed. In this situation, we have been choosing the combined surgery: modified scarf osteotomy for the great toe and metatarsal shortening offset osteotomy for the lesser toes in RA cases. A retrospective observational study of 53 RA patients (mean follow-up period: 4.6 years) who underwent the surgery was completed. RA foot ankle scores were assessed, using the Japanese Society for Surgery of the Foot (JSSF) standard rating system, and a self-administered foot evaluation questionnaire (SAFE-Q) was also checked to evaluate clinical outcomes. For radiological evaluations, deformity parameters were measured using radiographs of the feet with weight-bearing. JSSF hallux and lesser toes scores and the SAFE-Q score showed significant improvement in all indices. HVA, M1-M2A, M1-M5A, M2-M5A, and sesamoid position were significantly improved after surgery. At the final follow-up, the hallux valgus deformity had recurred in 4 feet (7.5%), and hallux varus deformity had developed in 8 feet (15.1%). No case of recurrent hallux valgus deformity required revision surgery. Recurrence of dorsal dislocation/subluxation of the lesser toe MTP joint was seen in 6 feet (11.3%) after surgery. A combination of modified scarf osteotomy for the great toe and modified metatarsal shortening offset osteotomy for the lesser toes is one of the novel surgical procedures for rheumatoid forefoot deformity. Preoperative disease activity of RA negatively affected the clinical score of the hallux. The spread of M2-M5A was a risk factor for resubluxation of the lesser toe MTP joint.

Outcome of proximal triple derotational metatarsal osteotomy for three-dimensional correction of hallux valgus deformity.

To correct hallux valgus deformities in patients with a greater pronation of the first metatarsal, we designed a novel proximal triple derotational metatarsal osteotomy (PTDMO), which could be used to achieve three-dimensional correction of hallux valgus deformities at the proximal metatarsal level. We prospectively evaluated the radiographic and clinical outcomes of 13 consecutive cases underwent PTDMO between November 2018 and May 2020. The minimum follow-up for inclusion was 12months. The hallux valgus angle (HVA), first-to-second intermetatarsal angle (IMA), distal metatarsal articular angle (DMAA), relative length of the second metatarsal, and medial sesamoid position on the weight bearing foot anteroposterior radiographs, and the degree of the first metatarsal pronation on forefoot axial radiographs were measured pre-operatively, at sixweeks post-operatively, and at the final follow-up. The American Orthopaedic Foot and Ankle Society (AOFAS) score and Foot Ankle Outcome Scores (FAOS) were measured. In the comparison of pre-operative and final follow-up parameters, HVA, IMA, and DMAA were significantly improved post-operatively (all, P < 0.001). The relative length of the second metatarsal did not differ significantly post-operatively (P = 0.724). The medial sesamoid was significantly reduced (P = 0.01), and the first metatarsal pronation decreased by 10.16° (P = 0.034). Regarding clinical parameters, the AOFAS score and FAOS in all categories significantly improved post-operatively (all, P < 0.001). PTDMO resulted in satisfactory radiographic and clinical outcomes with respect to deformity correction and pain relief, with significant post-operative reduced pronation of the first metatarsal.

First-Ray Radiographic Changes After Flexible Adult Acquired Flatfoot Deformity Correction.

Adult acquired flatfoot deformity (AAFD) and hallux valgus (HV) are common foot and ankle deformities. Few studies have reported the changes in radiographic parameters of HV after reconstructive surgery for AAFD. This study aimed to evaluate the changes in radiographic parameters of HV and analyze the risk factors for increased HV after correction of AAFD. Adult patients with flexible AAFD who underwent similar bony procedures including medializing calcaneal osteotomy and Cotton osteotomy were included. Radiographic parameters were measured on weightbearing radiographs preoperatively, postoperatively, and at the final follow-up. Patients were divided into hallux valgus angle (HVA) increased and HVA nonincreased groups; logistic regression analysis was performed to identify risk factors affecting increased HV. Forty-six feet of 43 patients were included. After AAFD reconstructive surgery, the tibial sesamoid position improved by 1 grade, but the HVA increased 4 degrees in average. Further, 21 of 46 feet (46%) showed an HVA increase ≥5 degrees immediately after AAFD correction surgery. Preoperative talonavicular coverage angle <21.6 degrees was a risk factor associated with HV increase immediately after the surgery. In this case series, using plain radiographs to measure standard parameters of foot alignment, we found the association between AAFD correction and HV deformity measures somewhat paradoxical. Correction of overpronation of the hindfoot and midfoot appears to improve the first metatarsal rotational deformity but may also increase HVA. A lower preoperative talonavicular coverage angle was associated with an increase of the HVA after surgery. Level IV, case series study.

A prospective study to compare the operative outcomes of minimally invasive proximal and distal chevron metatarsal osteotomy for moderate-to-severe hallux valgus deformity.

The effectiveness of minimally invasive surgery (MIS)-distal chevron metatarsal osteotomy (DCMO) for the correction of moderate-to-severe hallux valgus deformity is unclear. This study aimed to compare the radiographic and clinical outcomes of our novel MIS-proximal chevron metatarsal osteotomy (PCMO) with those of MIS-DCMO performed during the same timeframe. We prospectively compared the outcomes of patients who underwent MIS-PCMO (n = 20 patients; 22 cases) with those of patients who underwent MIS-DCMO (n = 23 patients; 26 cases) for moderate-to-severe hallux valgus deformity (hallux valgus angle [HVA] ≥ 30° and first-to-second intermetatarsal angle [IMA] ≥ 13°) between June 2017 and January 2019. The minimum follow-up duration for study inclusion was twoyears. The HVA, IMA, distal metatarsal articular angle (DMAA), relative length of the second metatarsal, medial sesamoid position, and Meary's angle to evaluate the degree of deformity correction and its maintenance were measured pre-operatively and at the final follow-up. Compared with MIS-DCMO, MIS-PCMO resulted in significantly greater correction of the HVA (P < 0.001) and IMA (P = 0.01), along with Meary's angle improvement (P < 0.001); however, the DMAA worsened (P = 0 .01). Furthermore, a significantly greater change was found in the relative second metatarsal length in the MIS-DCMO group (P = 0.01). No significant between-group differences were noted in the correction of the medial sesamoid position (P = 0.445). Compared with MIS-DCMO, MIS-PCMO can be a better option for correcting moderate-to-severe hallux valgus deformities. However, this technique should be applied carefully when the pre-operative DMAA is already large because the DMAA can become worse post-operatively.

Correction of More Hallux Valgus Pathologic Disorders with a Single Distal Osteotomy: A New Surgical Technique

Hallux valgus, one of the most common deformities of the great toe, may cause pain, dysfunction, and impaired gait pattern. In this retrospective study we report the results of a new type of distal metatarsal osteotomy combined with distal soft-tissue release in patients with mild-to-moderate hallux valgus deformity. This new technique was used in the management of 32 feet of 31 patients (eight men and 23 women) with mild-to-moderate hallux valgus. Hallux valgus angle, intermetatarsal angle, and distal metatarsal articular angle were measured on preoperative, early postoperative (6-8 weeks), and late (1 year) postoperative radiographs. American Orthopaedic Foot and Ankle Society hallux metatarsophalangeal score was calculated. Sesamoid position, by considering medial sesamoid position, and metatarsal shortness were also measured. Statistically significant differences were detected between the preoperative and late postoperative measurements of the hallux valgus angle, distal metatarsal articular angle, intermetatarsal angle, and sesamoid position parameters in patients operated on with this technique. Improvement was 14° for the hallux valgus angle, 4° for the distal metatarsal articular angle, and 4° for the intermetatarsal angle. Sesamoid position was also improved, and the mean American Orthopaedic Foot and Ankle Society score was significantly improved. Metatarsal shortness greater than 2 mm was observed in two patients without resulting in any clinical discomfort. This new technique was easy, safe, and promising in patients diagnosed as having mild-to-moderate hallux valgus deformity.

Relationship Between Plantar Callosity and Foot Deformity in Hallux Valgus Using Weightbearing Computed Tomography

Plantar callosities under lesser metatarsals are often accompanied by the hallux valgus, and the cause of callosity is thought to be associated with the foot deformity, such as the metatarsal length discrepancy, the abnormal metatarsal head height, cavus, flat foot, and rheumatoid conditions. However, it is unclear which variable is most involved in the cause of callosity in hallux valgus deformity. To clarify the factors associated with the callosity with hallux valgus deformity, we conducted multiple image assessments based on weightbearing radiography and computed tomography. A retrospective review was performed based on the collection of clinical records from all patients with hallux valgus treated from 2010 to 2019 in our institution. We measured the hallux valgus angle, intermetatarsal angles, calcaneal pitch angles, talo-first metatarsal angles, metatarsal length, metatarsal head height, first metatarsal pronation angles, and sesamoid position with weightbearing radiography and computed tomography. We analyzed the relation between callosity formation and imaging assessments using univariate and multivariate logistic regression models. Fifty feet were retrospectively evaluated, and multiple logistic analyses by the stepwise method revealed that the first metatarsal-lateral-sesamoid distance was the only radiographical variable associated with callosity formation among all the tested variables (p < .001). As the grade of the callosity became more severe, the lateral shift of the lateral sesamoid increased. The position of the sesamoid bone appears to have a critical role in the assessment and choice of treatment protocols and further research needs to be conducted on the relationship with the position of sesamoid bone to elucidate the mechanism of callus formation.

Revisiting the original Akin technique: A comparative analysis of radiographic outcome

BackgroundThe Akin osteotomy is widely used to correct the hallux valgus and different fixation techniques have been proposed. Currently most of these procedures coexist, with disagreement on which offers the best results. The aim of this study is to compare the radiological outcome of the original Akin’s technique with one in which a staple was used to stabilize the osteotomy. We also assessed whether other factors unrelated to the osteosynthesis could influence the radiological outcome. MethodsWe retrospectively reviewed data from 118 patients who underwent a scarf and Akin osteotomy. In 60 patients the Akin osteotomy was fixed with a staple and in 58 cases no staple was used. Hallux valgus angle (HVA), distal articular set angle (DASA), interphalangeal angle (IPA) and tibial sesamoid position were measured. The presence of lateral cortex disruption of the phalanx was also included in the analysis. ResultsSix variables significantly influenced the radiological results of the Akin osteotomy: preoperative HVA, IPA and tibial sesamoid position, laterality, postoperative cortical disruption and use of a staple. ConclusionOurs results suggest that the original Akin’s technique seems to offer equal or better results than a variation in which a staple is added to stabilize the osteotomy. Level of evidenceThis is a level III retrospective case-control study.