Effect of first metatarsal shortening and dorsiflexion osteotomies on forefoot plantar pressure in a cadaver model

Special Considerations in Podiatric Science: Translational Research, Cadavers, Gait Analysis, Dermatology, and Databases

The objective of this article is to provide a brief overview of the critical analysis and design of unique and perhaps less common methodologies in podiatric science. These include basic science translational designs, cadaveric investigations, gait analyses, dermatologic studies, and database analysis. The relative advantages, disadvantages, and inherent limitations are reviewed with an intention to improve the interpretation of results and advance future foot and ankle scientific endeavors.

Minimally invasive Chevron Akin (MICA) osteotomy for severe hallux valgus

INTRODUCTION

The minimally invasive Chevron Akin (MICA) osteotomy has been widely used to treat hallux valgus (HV). The purpose of this study was to present a case series of patients with severe HV undergoing surgical treatment using the MICA procedure and to evaluate the clinical and radiographic outcomes.

MATERIALS AND METHODS

Retrospective study including 60 consecutive feet (52 patients) undergoing MICA for severe HV. The data were collected pre- and post-operatively at the last follow-up. Patients were clinically evaluated by the visual analog pain scale (VAS) and AOFAS hallux MTP-IP score. Radiographic assessments included measurements of hallux valgus angle (HVA), intermetatarsal angle (IMA), metatarsal (MT) length, distal metatarsal articular angle (DMAA), and plantar translation of MT head. The complications were recorded during the follow-up.

RESULTS

The mean age was 59.9 years, and the mean follow-up was 20.5 months. The average AOFAS increased from 41.2 to 90.9 points, and the VAS from 8.1 to 1.3 at the last follow-up. The average HVA decreased from 41.2º to 11.6º, the IMA from 17.1º to 6.9º, and the DMAA from 17.9º to 7.8º. The average shortening of the first metatarsal and the plantar translation of the MT head was 5.1 mm and 2.8 mm, respectively. The most observed complication was hardware discomfort, observed in 5 feet (8.3%). There were two cases of recurrence (3.3%).

CONCLUSION

MICA technique was demonstrated in this series of cases to be an effective procedure for severe HV, with a low rate of recurrence and an acceptable rate of complications.

LEVEL OF EVIDENCE

IV; case series.

Early Outcomes of Third-Generation Minimally Invasive Chevron-Akin (MICA) Osteotomy for Symptomatic Hallux Valgus Deformity

Hallux valgus is a common progressive forefoot deformity. Although open techniques have shown good outcomes, no technique has been shown to be superior to other techniques. The current third generation of minimally invasive Chevron-Akin (MICA) technique features a percutaneous procedure with a stable internal fixation. The technique used in this study resulted in stable internal fixation; however, 1 screw was used in intramedullary fashion in the majority of cases. The purpose of this study is to review the early outcomes of MICA. Electronic Health Records (EHR) were queried for patients who underwent MICA to treat hallux valgus (HV) deformity, by a single surgeon. The primary clinical outcomes assessed were visual analog pain score (VAS), rate of revision surgery, and recurrence. Radiographic outcomes were assessed including pre and postoperative hallux valgus angle (HVA), intermetatarsal angle (IMA), and bony foot width. The secondary outcomes included postoperative complications. A total of 91 feet underwent MICA to correct symptomatic HV deformity. The mean age of this cohort was 53.63 ± 15.42 years, mean body mass index (BMI) of 26.81 ± 6.21 kg/m², mean follow-up of 6.33 ± 6.39 months and 87 feet belonged to female patients. Patients showed significant improvement in VAS and radiographic outcomes at final follow-up, with a mean improvement of 10.70° ± 6.42°, 2.39° ± 3.55°, and 5.30 mm ± 4.23 mm for the HVA, IMA, and bony foot width, respectively. Two patients (2.2%) required revision surgery for nonunion and removal of symptomatic hardware. One patient had a second metatarsal fracture treated nonoperatively. No feet had recurrence, hardware loosening, infection, or scar hypersensitivity. The current study reported on early outcomes for MICA. This technique appears to be effective and safe with no failure of fixation in our patients. We showed in our short-term follow-up, MICA led to significant improvement in pain and radiographic scores.Levels of Evidence: III, retrospective study.

Iatrogenic transfer metatarsalgia after hallux valgus surgery: a comprehensive treatment algorithm

Current literature has described many of the complications following hallux valgus surgery and their treatment options.

Iatrogenic transfer metatarsalgia is a distinctive and challenging complication that has not been addressed in a comprehensive fashion yet.

Iatrogenic transfer metatarsalgia may result from poor preoperative assessment, planning and/or surgical technique.

We have classified the causes of iatrogenic transfer metatarsalgia based on a multiplanar assessment of the malalignment(s) and are recommending a comprehensive treatment algorithm to guide surgeons in addressing this complication.

With this knowledge, surgeons may avoid potential pitfalls in the primary surgery that can result in iatrogenic transfer metatarsalgia and find the appropriate treatment option to correct them.

Iatrogenic second transfer metatarsalgia and the first metatarsal shortening and elevation after Scarf osteotomy

BACKGROUND

Transfer metatarsalgia is a potential complication of hallux valgus surgery. This study aimed to investigate the shortened first metatarsal length and elevation and to compare groups with and without second transfer metatarsalgia after Scarf osteotomy.

METHODS

The first metatarsal length of 123 feet was measured via the Maestro's method using the metatarsal axial length and the relative second metatarsal protrusion to the first metatarsal. Metatarsal elevation was measured using the first metatarsal angle.

RESULTS

Second transfer metatarsalgia occurred after Scarf osteotomy in 11 (8.9%) feet. When baseline characteristics were considered in propensity score matching, the 11 feet were compared with the 33 feet in the control group. The group with transfer metatarsalgia showed a more shortened first metatarsal axial length (-4.1 ± 1.8 mm vs. -2.5 ± 2.2 mm, p = 0.032), a significantly longer relative second metatarsal protrusion (+5.8 ± 2.6 mm vs. +1.2 ± 2.6 mm, p < 0.001), and a significantly lower first metatarsal angle (18.1 ± 4.3° vs. 21.5 ± 4.0°, p = 0.012) than the control group postoperatively.

CONCLUSIONS

To avoid iatrogenic transfer metatarsalgia, first metatarsal length shortening should be minimized to at least less than 4.0 mm. Furthermore, the metatarsal parabola should be retained.

Rotation scarf + Akin osteotomy for severe hallux valgus with a new evaluation index: distance between the first and second metatarsals

BACKGROUND

Although rotation scarf + Akin osteotomy has been described for correcting hallux valgus deformity, the treatment efficacy of rotation scarf + Akin osteotomy for severe hallux valgus should be further studied. The purpose of our study was to evaluate the outcomes of rotation scarf + Akin osteotomy on severe hallux valgus.

METHODS

We conducted a retrospective study of patients with hallux valgus who underwent surgery using rotation scarf + Akin osteotomy in our hospital between June 2014 and January 2020. The parameters evaluated include (1) the hallux valgus angle (HVA), (2) intermetatarsal angle (IMA), (3) distal metatarsal articular angle (DMAA), (4) tibial sesamoid position (TSP), (5) the length of first metatarsal bone and (6) ratio between the vertical distance from the lateral of the first metatarsal head to the medial of the second metatarsal head and the vertical distance of lateral of the second metatarsal head to the medial of the third metatarsal head (MT-I to II/II to III distance). A visual analog scale (VAS) was used to evaluate the degree of pain before and at the last follow-up after the operation. The American Orthopaedic Foot & Ankle Society (AOFAS) Forefoot Score wasassessed before and at the last follow-up after the operation. Patient satisfaction assessment was also conducted at the time.

RESULTS

All radiological parameters including, HVA, IMA, DMAA and TSP,, significantly improved (p < 0.001). The length of the first metatarsal was shortened 3.1 mm on average. The MT-I to II/II to III distance was also reduced to 1.8 after surgery and 3.3 before surgery. The VAS score and AOFAS score was also statistically significant before operation and at the last follow-up after the operation (p < 0.001). Forty-one (82%) feet in patients were very satisfied or satisfied.

CONCLUSION

Rotation scarf + Akin osteotomy is demonstrated to be safe, effective, and feasible for correcting severe hallux valgus. It can obtain good long-term correction with a low incidence of recurrence and metatarsalgia. Postoperative satisfaction and functional recovery of patients are significantly improved. The MT-I to II/II to III distance, a new evaluation indicator, can be better evaluate the correction of hallux valgus.

Minimally Invasive vs. Open Surgery for Hallux Valgus: A Meta-Analysis

Purpose

In recent years, minimally invasive surgery (MIS) for hallux valgus has emerged and gained popularity. To date, evidence on the benefits of MIS for hallux valgus is still controversial. This updated meta-analysis aimed to comprehensively evaluate the efficiency of MIS vs. open surgery for hallux valgus.

Methods

A systematic literature search of PubMed, Embase, and the Cochrane Library was performed. Two independent reviewers conducted data extraction and analyzed data with R software. Data were presented with risk ratio (RR) and standardized mean difference (SMD) along with 95% confidence interval (CI).

Results

A total of 22 studies in which there were 790 ft treated with the MIS procedure and 838 ft treated with an open procedure were included. The correction of sesamoid position was better in the MIS group. The post-operative distal metatarsal articular angle (DMAA) of the MIS group was lower. There was less pain at the early phase in the MIS group. The MIS group had a shorter surgery time and shorter hospitalization time compared with the open group. Our meta-analysis revealed no statistically significant difference in hallux valgus angle (HVA), first intermetatarsal angle (IMA), the first metatarsal shortening, the American Orthopedic Foot and Ankle Society (AOFAS) score, visual analog scale (VAS) score at the final follow-up or complication rate (when all studies were considered). When taking into consideration only randomized controlled trial (RCT), the AOFAS score was higher in the MIS group while HVA, IMA, DMAA, and complication rate remained no significance. Post-operative IMA of the MIS group was significantly lower when only studies reporting the second-generation (2G) MIS were included. When just studies adopting the third-generation (3G) MIS were included, the HVA and DMAA were lower in the MIS group.

Conclusion

The MIS procedures were more effective than open surgeries in the treatment of hallux valgus. Moreover, the MIS group achieved better radiologic and clinical outcomes compared with the open group.

Shortening effect influence of Distal Minimally Invasive Metatarsal Osteotomy in primary metatarsalgia

PURPOSE

In primary metatarsalgia, Distal Minimally invasive Metatarsal Osteotomy (DMMO) achieves a correct load distribution which is a factor in pain relief, but contrary to the elevation of the metatarsal head, shortening the metatarsal length has no influence on plantar-loading parameters, while the increased metatarsal length is a factor in the development of metatarsalgia. Thus, we hypothesized that metatarsalgia could be partly related to a functional imbalance between bone structure and soft tissues and pain relief after DMMO results from soft tissue relaxation.

METHODS

Many authors have highlighted the correlation between joint pressure and periarticular soft tissue tension. To test our hypothesis, we measured intra-operatively the MTPJ pressure of 19 patients suffering from primary metatarsalgia, before and after DMMO. This pressure is being analyzed as a reflection of joint decompression and forefoot soft tissue release. Many authors have highlighted the correlation between joint pressure and periarticular soft tissue tension.

RESULTS

Lower metatarsals presenting metatarsalgia show a significantly lower MTPJ pressure compared to asymptomatic rays, and DMMO induces a significant increase of MTPJ pressure.

CONCLUSION

Those variations reflect the functional imbalance between bone structure and soft tissue in primary metatarsalgia. The biomechanical rationale of the shortening effect of DMMO could therefore be explained by the release of forefoot soft tissue, which could take part in the pain relief by restoring this balance.

Allograft Interposition Bone Graft for First Metatarsal Phalangeal Arthrodesis: Salvage After Bone Loss and Shortening of the First Ray

BACKGROUND

Previous studies have demonstrated success in using autogenous bone graft for arthrodesis in patients with failed surgeries of the hallux. These patients have several causes for pain and dysfunction preoperatively, including a shortened first ray, nonunion, and poor hallux alignment.

METHODS

In this study, a consecutive series of 36 patients (38 procedures) were treated with a patellar wedge interposition structural allograft to salvage bone loss from great toe arthrodesis malunion, painful joint replacement, failed osteotomy, or infection of the great toe metatarsophalangeal (MP) joint with shortening of the first ray. The goals of the surgery were to restore length to the first ray and provide a stable MP joint fusion to relieve pain. The 38 treated toes were evaluated for preoperative and postoperative American Orthopaedic Foot & Ankle Society (AOFAS) MP scores, subjective patient outcome scores, and clinically successful fusion of the hallux.

RESULTS

At a minimum 1-year follow-up (mean, 3.2 years), all but 2 feet healed with a solid fusion, and all healed patients reported good or excellent outcomes. AOFAS MP scores averaged 43.5 preoperatively and 77.2 postoperatively. Three patients with infection as cause for nonunion of the initial procedure were treated with staged procedures, including the use of a temporary antibiotic spacer and mini external fixator; all 3 healed without recurrent infection. One patient had a fracture of her allograft following her interposition arthrodesis, but it fused successfully after a second interposition arthrodesis surgery. Two patients developed a nonunion of the revision arthrodesis.

CONCLUSION

The use of an interposition patellar wedge allograft can restore length to the first ray and provide successful salvage of arthrodesis nonunions and bone loss from failed hemiarthroplasty and total joint implants of the great toe MP joint.

LEVEL OF EVIDENCE

Level IV, retrospective case series.

Joint Preparation and Ray Shortening in Arthroscopic Versus Open First Metatarsophalangeal Fusion: A Cadaver Study

Purpose This study compares the amount of joint preparation and first ray shortening following first metatarsophalangeal (MTP) joint fusion utilizing open conical reaming versus arthroscopic technique. Methods Ten below-knee cadaver specimens were randomly assigned to undergo either open or arthroscopic first MTP fusion. Following fixation, first ray length measurements were obtained from pre-operative and post-operative radiographs and were used to determine first ray shortening. Additionally, the ratio of first ray length to second ray length was calculated both pre-operatively and post-operatively and compared between the two approaches. All ankles were then completely dissected, and prepared surface areas were demarcated. ImageJ photo analysis software (National Institutes of Health, Bethesda, MD, USA) was used to calculate the percentage of prepared and unprepared cartilage of each articular surface of each specimen.  Results Overall, the open approach resulted in 99.3% ± 1.6% joint surface preparation, whereas the arthroscopic approach yielded 92.9% ± 7.2% (p = 0.089). On average, the head of the first metatarsal was significantly more prepared with the use of the open approach (99.5% ± 1.1%) than with the arthroscopic approach (96.6% ± 1.5%) (p = 0.008). However, with respect to the base of the phalanx, the average difference in preparation between the arthroscopic approach and the open approach was not statistically significant (90.0% ± 12.8% vs. 99.0% ± 2.2%; p = 0.160). The average amount of first ray shortening in the arthroscopic approach was 2.2 ± 1.8 mm compared to 2.1 ± 3.2 mm in the open approach (p = 0.934). The average change in the first to second ray length ratio was 0.02 for both approaches (p = 0.891). Conclusion Arthroscopic first MTP fusion can be used to achieve joint preparation comparable to open technique while maintaining first ray length.

Early results of minimally invasive, reverse-oblique, distal metaphyseal metatarsal osteotomy (R-DMMO) for arthritis of the lesser tarsometatarsal joints - A retrospective case series

BACKGROUND

Arthrodesis is the gold standard for operative management of osteoarthritis of the lesser tarsometatarsal joints (TMTJs) but is not without complications. Our early results of a minimally invasive alternative treatment - the reverse-oblique distal metaphyseal metatarsal osteotomy (R-DMMO) are described.

METHODS

This is a single-centre, single-surgeon, retrospective series of patients with isolated, symptomatic lesser TMTJ arthrosis who underwent R-DMMO.

RESULTS

Sixteen feet in 15 patients were included. The mean age was 64.7±9.7 years and mean duration of follow-up was 109.4±27.4 weeks. There were no non-unions, infections or wound complications. Two patients developed transfer symptoms to their first metatarsal, one of these patients improved after three months. There was one delayed union which united at 12 months. Two patients developed recurrence of symptoms but felt that they were still improved compared to preoperatively and no patient has required arthrodesis thus far. The mean preoperative VAS was 8.3±1.3 and the mean postoperative VAS was 2.4±2.2 (P<0.001). The mean postoperative MOxFQ-Walking was 25.2±25.6, MOxFQ-Pain was 24.8±20.5, MOxFQ-Social was 18.4±19.1, and MOxFQ-Index was 23.4±20.6. Eight patients were 'very satisfied' and seven were 'satisfied' with the procedure.

CONCLUSIONS

R-DMMO is a minimally invasive and safe procedure for lesser TMTJ arthrosis which can produce good results and prevent, or at least delay, the need for arthrodesis without compromising future operative options. Good to excellent outcomes have been shown with few significant complications in the short term in selected patients.

Preliminary Experience With a Minimally Invasive Technique for Hallux Valgus Correction With No Fixation

BACKGROUND

Percutaneous operative techniques for hallux valgus (HV) correction are less damaging to soft tissues and the first metatarsophalangeal joint, and they carry a lower risk of wound complications. We report our preliminary results using a percutaneous technique that allowed correction of the deformity without internal fixation.

METHODS

One hundred ninety-five consecutive patients with isolated symptomatic HV were surgically treated using a percutaneous technique without any form of internal fixation, with a mean follow-up of 34.6 months. The American Orthopaedic Foot & Ankle Society (AOFAS) hallux-metatarsophalangeal-interphalangeal scale score was used for clinical assessment. Radiographic evaluation included pre- and postoperative assessment of the hallux valgus angle (HVA), intermetatarsal angle (IMA), distal metatarsal articular angle (DMAA), and sesamoid position in weightbearing radiographs.

RESULTS

According to the AOFAS score, the patients improved from a preoperative median of 54.7 to 89.6 at 2 years' follow-up (P = .002). Patients were satisfied or very satisfied in 94% of cases at the latest follow-up. A mean radiographic correction of the HVA of 15.5 degrees, of the IMA of 5.4 degrees, and of the DMAA of 5.4 degrees was achieved. The AOFAS global score and every individual parameter improved significantly between pretreatment and latest follow-up (P > .01). A total of 19 (9.7%) complications were reported.

CONCLUSION

This percutaneous technique, which did not use any form of internal fixation described, produced durable results for the correction of HV, reliably correcting the deformity and resulting in significant improvement in function and decrease of pain.

LEVEL OF EVIDENCE

Level IV, retrospective case series.

Hallux valgus correction with a new percutaneous distal osteotomy: Surgical technique and medium term outcomes

BACKGROUND

Many procedures and different osteotomies have been described for percutaneous hallux valgus correction. Percutaneous techniques may lead to reduced morbidity, surgery, and recovery time. The aim of this study is to evaluate the clinical and radiographic outcome of a new percutaneous procedure (PBS-Percutaneous Bianchi System).

METHODS

Fifty-eight cases were treated with Percutaneous Bianchi System procedure for correction of mild, moderate or severe hallux valgus deformity. All patients were clinically assessed preoperatively and then followed up by weight-bearing x-rays, AOFAS (American Orthopedic Foot and Ankle Score), VAS (Visual Analog Scale) pain score, and patient satisfaction.

RESULTS

AOFAS scores improved from 28.6 at the preoperative assessment to 91.7 at the latest follow-up. The VAS pain score improved from 6.7 before surgery to 0.6 at the latest follow-up. The mean Hallux valgus angle (HVA), Intermetatarsal angle (IMA) and Distal metatarsal articular angle (DMAA) significatively decreased from the preoperative assessment to the latest follow-up.

CONCLUSIONS

The PBS technique is a safe, reliable, and effective procedure for the correction of symptomatic mild-to-severe hallux valgus.

The Role of First Ray Insufficiency in the Development of Metatarsalgia

Two theories exist in the development of central or transfer metatarsalgia. First, as the severity of hallux valgus increases, there is mechanical overload of the second metatarsal. Second, increased relative lesser metatarsal length is thought to contribute to metatarsalgia. It is imperative, in the treatment of first ray disorders (hallux valgus or hallux rigidus), to not overshorten the first ray when addressing the first ray pathologic condition. Treatment of metatarsalgia in the setting of failed hallux valgus correction can be treated with both conservative and surgical options.

Minimally invasive distal metaphyseal metatarsal osteotomy (DMMO) for symptomatic forefoot pathology - Short to medium term outcomes from a retrospective case series

BACKGROUND

Minimally invasive distal metaphyseal metatarsal osteotomy (DMMO) may be used to treat metatarsalgia and forefoot pathology. Few large series report its results or examine the degree of metatarsal shortening with this technique. The clinical and radiographic results of a cohort of patients treated with DMMOs at our unit are reported.

METHODS

This was a single-centre retrospective study looking at the outcome of consecutive patients undergoing DMMOs. Demographics, radiological and clinical outcomes, complications and patient reported outcome measures (PROMs) were analysed.

RESULTS

DMMOs on 106 toes in 43 feet were included. Mean age was 60.2±10.2 years and median follow-up was 38 months. Concurrent procedures were performed in 26 cases (60%). DMMO was performed on multiple toes in 42 cases (97%). Mean shortening achieved was 3.6±2.2mm, 4.1±1.6mm, and 3.6±1.6mm for the second, third and fourth metatarsals respectively. Mean time to fusion was 11.4±7.8 weeks and union occurred in 105 toes (99%). The single non-union was asymptomatic at 12 months. Two patients required a subsequent additional DMMO for transfer metatarsalgia. Minor complications were seen in 11 patients (26%). At final follow-up PROMs data was available for 42 cases: mean MOxFQ was 28.8±27.6, mean EQ-5D was 0.789±0.225, mean EQ-VAS was 68.5±20.3, mean VAS-Pain score was 3.1±2.8, and patients were satisfied overall in 40 cases (95%).

CONCLUSIONS

The authors demonstrate excellent radiological and clinical outcomes in the short to medium term with DMMOs and present data on metatarsal shortening achieved with this technique.

The excessive length of first ray as a risk factor for hallux valgus recurrence

BACKGROUND

It is still unknown whether the excessive length of the first ray is a risk factor for hallux valgus recurrence. The purpose of this study is to clarify the relationship between the excessive length of the first ray and the recurrence of hallux valgus.

METHODS

Between 2008 and 2011, a total of 186 feet (left 105, right 81) who underwent chevron osteotomy combined with distal soft tissue procedure in our foot and ankle center were retrospectively reviewed. A postoperative hallux valgus angle(HVA) ≥20° was defined as recurrence. Patients were divided into two groups: recurrence and non-recurrence group. Weight-bearing radiographs were evaluated preoperatively and at the time of last follow-up for both groups. Radiographic parameters including the length of the great toe(P1), the length of the second toe(P2), the length distance between the first and second metatarsal(D), the hallux valgus angle(HVA) were obtained. The excessive length of the first ray(EL) was calculated using the equation of EL = P1-P2-D.

RESULTS

A total of 45 patients (24.2%) had hallux valgus recurrence at the time of last follow-up with a mean follow-up of 83.7 ±12.1 months (range, 66-110). The mean postoperative P1 was 5.06±0.39cm for recurrence group and 4.84±0.34cm for no recurrence group(p<0.001). The mean post operative EL was 5.71±5.01mm for recurrence group and 1.61±4.09mm for no recurrence group(p<0.001). The predictive cutoff value of postoperative P1 and postoperative EL for hallux valgus recurrence was 4.9cm [odds ratio (OR) = 8.67, p = 0.03] and 0.4cm (OR = 6.79, p = 0.001) respectively.

CONCLUSIONS

Significant relationships between postoperative P1, postoperative EL and hallux valgus recurrence were identified according to our radiographic results. A postoperative P1>4.9cm and postoperative EL>0.4cm can be risk factors for hallux valgus recurrence. The appreciation of the excessive length of the first ray prior to surgery may help to improve the surgical outcome.

Technique tip: Simultaneous first metatarsal lengthening and metatarsophalangeal joint fusion for failed hallux valgus surgery with transfer metatarsalgia

BACKGROUND

Failed hallux valgus surgery may result in residual or recurrent hallux valgus, and as well transfer metatarsalgia. The present technical tip concerns the combination of fusion of the first metatarsophalangeal (MTP) joint and lengthening of the first metatarsal (MT) through a scarf osteotomy.

MATERIALS AND METHODS

Six patients underwent the presented technique, all for the indication of failed hallux valgus surgery with shortening of the first MT and degenerative changes in the 1st MTP joint.

RESULTS

Follow-up at six months revealed all patients had complete healing of the osteotomy and arthrodesis sites. They were all asymptomatic and fully active, completely satisfied with the outcome.

CONCLUSIONS

Combined fusion of the first MTP joint and lengthening of the first MT through a scarf osteotomy results in an excellent outcome in patients with failed hallux valgus surgery with shortening of the first MT and degenerative changes in the 1st MTP joint.

Minimally Invasive and Open Distal Chevron Osteotomy for Mild to Moderate Hallux Valgus

BACKGROUND

Minimally invasive surgical (MIS) techniques are increasingly being used in foot and ankle surgery but it is important that they are adopted only once they have been shown to be equivalent or superior to open techniques. We believe that the main advantages of MIS are found in the early postoperative period, but in order to adopt it as a technique longer-term studies are required. The aim of this study was to compare the 2-year outcomes of a third-generation MIS distal chevron osteotomy with a comparable traditional open distal chevron osteotomy for mild-moderate hallux valgus. Our null hypothesis was that the 2 techniques would yield equivalent clinical and radiographic results at 2 years.

METHODS

This was a retrospective cohort study. Eighty-one consecutive feet (49 MIS and 32 open distal chevron osteotomies) were followed up for a minimum 24 months (range 24-58). All patients were clinically assessed using the Manchester-Oxford Foot Questionnaire. Radiographic measures included hallux valgus angle, the intermetatarsal angle, hallux interphalangeal angle, metatarsal phalangeal joint angle, distal metatarsal articular angle, tibial sesamoid position, shape of the first metatarsal head, and plantar offset. Statistical analysis was done using Student t test or Wilcoxon rank-sum test for continuous data and Pearson chi-square test for categorical data.

RESULTS

Clinical and radiologic postoperative scores in all domains were substantially improved in both groups (P < .001), but there was no statistically significant difference in improvement of any domain between open and MIS groups (P > .05). There were no significant differences in complications between the 2 groups ( > .5).

CONCLUSION

The midterm results of this third-generation technique show that it was a safe procedure with good clinical outcomes and comparable to traditional open techniques for symptomatic mild-moderate hallux valgus.

LEVEL OF EVIDENCE

Level III, retrospective comparative study.

Effect of First Ray Insufficiency and Metatarsal Index on Metatarsalgia in Hallux Valgus

BACKGROUND

Two concepts have been proposed to explain the etiology of metatarsalgia in hallux valgus patients: First, as the magnitude of hallux valgus increases, there is a mechanical overload of the lesser metatarsals. Second, increased relative lesser metatarsal length is a factor in the development of metatarsalgia. However, there is no current evidence that these structural factors lead to primary metatarsalgia. The purpose of the study was to evaluate the factors associated with metatarsalgia in hallux valgus patients.

METHODS

A cross-sectional study of 121 consecutive adult patients with non-arthritic hallux valgus was carried out. Binary logistic regression was performed to identify the effect of the clinical and demographic factors on the occurrence of metatarsalgia. One hundred twenty-one patients (184 feet) with hallux valgus were analyzed. The median weight was 65 kg (interquartile range 58-72).

RESULTS

Metatarsalgia was present in 84 (45.6%) feet. The binary logistic regression showed that lesser toe deformity (OR 2.6, 95% CI 0.2-0.5), gastrocnemius shortening (OR 5.8, 95% CI 2.8-12.3), metatarsal index (OR 0.3, 95% CI 0.2-0.5), and weight (OR 2.5, 95% CI 1.2-5.3) were significantly associated.

CONCLUSION

Metatarsalgia occurs in almost half of hallux valgus patients. It has a multifactorial etiology. Our findings contradict the common theory that both the magnitude of hallux valgus deformity and an increased length of the lesser metatarsals, by themselves, lead to primary metatarsalgia. Metatarsalgia was associated with Achilles shortening, excessive weight, and associated lesser toe deformity. These factors should be addressed in order to treat this disorder adequately.

LEVEL OF EVIDENCE

Level III, comparative series.

Inherent Strength of the osteo-WEDGE(™) Bone Plate Locking System for Arthrodesis of the First Metatarsocuneiform Joint: A Biomechanical Study

First metatarsocuneiform joint arthrodesis with a locking bone plate and screw system has been effectively used to correct metatarsus primus varus and instability of the first ray. The goal of the present cadaveric biomechanical study was to quantify and compare the inherent strength of the first metatarsocuneiform joint and surrounding bones fixated with the osteo-WEDGE(™) bone plate locking system (OW) with that of intact specimens. Fourteen fresh-frozen adult human cadaveric foot specimens consisting of the first metatarsal and medial cuneiform bones with intact joint capsules and ligaments were used. The OW was implanted in 7 of these specimens at the first metatarsal cuneiform joint (MCJ), and the remaining 7 specimens were left intact. Each of the specimens was then subjected to axial force to simulate dorsiflexion of the first metatarsal using a cantilever bending test setup. Load was applied on the plantar aspect of the first metatarsal head until failure of the construct. The mean load and bending moment on the first MCJ at failure for the implanted specimens were 119.98 ± 56.76 N and 5.57 ± 2.71 Nm, respectively. For the intact specimens, the mean load and bending moment on the first MCJ at failure were 107.93 ± 60.90 N and 6.07 ± 3.18 Nm, respectively. None of the specimens showed catastrophic failure within the physiologic loading limits. These results imply that the mechanical strength of the OW is comparable to that of intact specimens. Thus, the first MCJ and surrounding bones fixated with an OW should be able to effectively withstand the vertical ground reaction forces the same as intact specimens.

Study of the metatarsal formula in patient with primary metatarsalgia

Objectives

The aims of this study were (i) to ascertain the prevalence of different types of metatarsal formula among patients with primary metatarsalgia; (ii) to compare the variable of “shortening of the first metatarsal in relation to the second” (I/II) between the metatarsalgia and control groups; and (iii) to analyze the intra and interobserver concordance by means of Morton's transverse line method and Hardy and Clapham's arc method.

Methods

A cross-sectional observational study was conducted on 56 patients by means of radiographs on their 112 ft, of which 56 were in the metatarsalgia group and 56 in the control group. The evaluations were done between December 2012 and June 2013. The measurements were made by three third-year orthopedics residents with prior training in the methods used, and a template was used.

Results

There was no concordance between the two methods, as shown by Bland–Altman plots, although the intraclass correlation coefficients showed that the intra and interobserver reproducibility was high using the transverse line method (0.78 and 0.85) and moderate using the arc method (0.73 and 0.60). Comparison between the groups showed that there was a statistical difference (p ≤ 0.05) such that there was greater shortening of the first metatarsal (3.39 mm) in the control group than in the metatarsalgia group (2.14 mm). In the patients with primary metatarsalgia, the index minus metatarsal formula was more prevalent according to the transverse line method (62.5%) and the zero plus type according to the arc method (71.4%).

Conclusion

In the present study, it was observed that the metatarsal formula prevalences depended on the measurement method. In both groups, shortening of the first metatarsal predominated. There was no intra or interobserver concordance in either of the two proposed methods.

Maintenance of longitudinal foot arch after different mid/hind-foot arthrodesis procedures in a cadaveric model

BACKGROUND

Currently, the optimal treatment of flatfoot remains inconclusive. Our objectives were to understand the effect of different arthrodeses on maintenance of foot arch and provide experimental basis for rational selection in treatment of flatfoot.

METHODS

Sixteen fresh-frozen cadaver feet amputated above the ankle along with a section of leg were studied from ten males and six females. We used standard clinical techniques and hardware for making the arthrodeses. Plantar pressure in the medial and lateral longitudinal arch distribution was measured with a plantar pressure mapping system under different loading conditions.

FINDINGS

Values of plantar pressure reaction, mean and maximum dynamic peak pressure between all group pairs were statistically significant (P<0.05). The plantar pressure reaction appeared at the load of 960 N in the medial arch of the unoperated foot, compared with 1080 N after subtalar arthrodesis, 1200 N after talonavicular arthrodesis, 1080 N after calcaneocuboid arthrodesis, 1320 N after double arthrodesis, and 1560 N after triple arthrodesis. The plantar pressure reaction appeared at the load of 360 N in the lateral arch of the unoperated foot, compared with 600 N after subtalar arthrodesis, 600 N after talonavicular arthrodesis, 840 N after calcaneocuboid arthrodesis, 960 N after double arthrodesis, and 1440 N after triple arthrodesis.

INTERPRETATION

The triple arthrodesis provided the highest support to both arches; the double arthrodesis appeared to be similar to talonavicular arthrodesis in supporting the medial arch and similar to calcaneocuboid arthrodesis in supporting the lateral arch; subtalar arthrodesis was less effective in supporting both arches.

The Influence of the Length of the First Metatarsal on the Risk of Reulceration in the Feet of Patients With Diabetes

Our aim was to identify the optimal diagnostic cutoff point on the scale of protrusion measurements of the first metatarsal (M1) to predict the probability of reulceration after metatarsal head resection in patients with diabetes mellitus. We conducted a prospective study of patients with diabetes who underwent resection of at least 1 metatarsal head in our department. After surgery, we measured the difference in length (protrusion) between the M1 and the longest of the 4 lesser metatarsals by radiographic view. The patients were divided into those in whom the M1 was the longest of the 5 metatarsals (group 1) and patients in whom at least one of the lesser metatarsals was longer than the M1 (group 2). They were followed-up for 12 months and were assessed for reulceration. Ninety-one patients were included in the present study: 43 (47%) in group 1 and 48 (53%) in group 2. In group 1, the longer the protrusion of M1 was, the higher the probability for reulceration ( P < .001, 95% confidence interval = 0.813-0.997). In group 2, the shorter the protrusion of M1, the higher the probability for reulceration ( P = .002, 95% confidence interval = 0.628-0.905). The optimal cutoff point for group 1 was 11 mm (sensitivity = 84.6%, specificity = 86.7%) for the probability of reulceration. In group 2, it was −7 mm (sensitivity = 81.8%, specificity = 65.4%). These results suggest that M1 protrusion is an optimum prognostic indicator for reulceration and could be recommended for detecting patients at risk of reulceration after surgery.

First metatarsophalangeal joint arthrodesis; what is the best fixation option? A critical review of the literature

First metatarsophalangeal joint arthrodesis can be accomplished using many forms of fixation. Distinguishing the best fixation construct requires evaluation of many variables. A review of the literature provides a starting point for what needs to be assessed and what questions need to be asked. In vivo and in vitro studies attempt to provide answers but frequently reveal shortcomings in the evidence to date. In the end, there is always 1 best fixation technique.

Long term efficacy of minimal incision osteotomy for hallux abducto valgus

OBJECTIVE

To observe and evaluate the long-term results of minimal incision osteotomy for hallux abducto valgus.

METHODS

From February 1995 to May 1999, 372 cases (705 feet) with hallux abducto valgus were treated with minimal incision osteotomy. Seventy-nine patients (150 feet) were followed up for more than five years (mean 7.5; range, 5.3-13.2 years) after surgery. The preoperative and postoperative hallux abducto valgus angles (HVA), intermetatarsal angles (IMA), tibial sesamoid position (TSP), American Orthopaedic Foot And Ankle Society (AOFAS) score, range of movement of the first metatarsophalangeal joint and lateral metatarsalgia were observed, measured and evaluated.

RESULTS

Based on clinic curative effect evaluation criterion, 56 feet (37.3%) were excellent, 88 feet (58.7%) good, 6 feet (4.0%) fair. The postoperative mean AOFAS score was 84.20 ± 4.32 points. The mean HVA decreased from 33.28° to 12.31° and the mean IMA1-2 from 11.75° to 6.80°. The TSP was corrected from an average preoperative grade of 4.29 to a grade of 3.07 by final follow-up. There was no nonunion or delayed union, no avascular necrosis, no infection, and no hallux varus. Numbness in the big toe was found in 4 feet (2.7%). The range of motion of the first metatarsophalangeal joint decreased from 70.20° to 69.53°. Of 97 feet (64.7%) with pre-operative 2-5 metatarsalgia, this had disappeared in 35 feet, improved in 54 feet and was aggravated in 8 feet postoperatively.

CONCLUSION

Minimal incision osteotomy is a simple and reliable technique for treating hallux abducto valgus with minimal complications.

Weil osteotomy: assessment of medium term results and predictive factors in recurrent metatarsalgia

BACKGROUND

The angle of the Weil osteotomy is usually referenced relative to the floor irrespective of the plantar angulation of the metatarsal. This study aims to analyse the long term results following the Weil osteotomy and identify the cause of poor outcome.

METHODS

This study presents a retrospective review of 61 patients (86 feet), with mean follow-up of 31 months. Each patient underwent clinical, pedobarographic and radiological examination. The radiographs obtained included 'Metatarsal Skyline Views' (MSV), to assess the plantar declination of the metatarsal heads following the osteotomy. The functional scoring was performed using AOFAS and Foot Function Index.

RESULTS

Fifty-five patients (80 feet) showed good to excellent results clinically. Six patients had persistent metatarsalgia. All these 6 patients had callosities beneath metatarsal heads. Pedobarography showed peak pressures in the same distribution as callosities and the MSV showed increased plantar declination of the metatarsal heads. This correlation was found to be significant (p<0.05).

CONCLUSION

The Weil osteotomy is a safe and effective treatment for metatarsalgia. An MSV radiograph is helpful to identify the plantar prominence of metatarsal which can be associated with poor clinical outcomes.

Metatarsal length does not correlate with maximal peak pressure and maximal force

BACKGROUND

Primary metatarsalgia of the lesser metatarsals is common and caused by mechanical overload of the affected metatarsal heads. Increased metatarsal length generally is believed to be a factor in the development of primary metatarsalgia. However, there is no clear biomechanical evidence supporting this theory.

QUESTIONS/PURPOSES

We asked whether metatarsal length correlated with plantar-loading parameters under the corresponding metatarsal heads.

PATIENTS AND METHODS

We prospectively followed two groups of patients 46 (51 feet) with and 45 (51 feet) without metatarsalgia. Each foot was physically examined and underwent standardized full-weightbearing radiography and dynamic pedobarography to assess maximal peak pressure and maximal force under the first, second, and third metatarsal heads. We correlated the relative length of the first and third metatarsals with the corresponding two plantar-loading parameters. We compared maximal peak pressure and maximal force in patients with metatarsalgia with those of symptom-free patients.

RESULTS

The relative length of the first and third metatarsals did not correlate (r < 0.13) with the maximal peak pressure or maximal force under the corresponding metatarsal heads. Maximal force under the first metatarsal head was decreased in the metatarsalgia group. There was no difference in maximal peak pressure between the metatarsalgia and nonmetatarsalgia groups.

CONCLUSIONS

Relative metatarsal length had no influence on plantar-loading parameters. Shortening of a symptomatic ray to decrease plantar-loading parameters cannot be supported from a biomechanical rationale.

Clinical outcomes after isolated periarticular osteotomies of the first metatarsal for hallux rigidus: a systematic review

Isolated periarticular osteotomy of the first metatarsal has been proposed for treatment of hallux rigidus due to the perceived ability to "decompress" the first metatarsophalangeal joint through axial shortening, as well as plantar displacement of the first metatarsal head to correct purported elevation. Additionally, isolated periarticular osteotomy of the first metatarsal has been proposed for treatment of hallux rigidus because of the perceived safety and efficacy. Furthermore, it has been proposed that undergoing isolated periarticular osteotomy of the first metatarsal does not prevent the ability to perform revision surgery. The author undertook a systematic review of electronic databases and other relevant sources to identify material relating to the clinical outcomes and need for surgical revision after isolated periarticular osteotomy of the first metatarsal for hallux rigidus. Information from peer-reviewed journals, as well as from non-peer-reviewed publications, abstracts and posters, and unpublished works, was also considered. In an effort to procure the highest quality studies available, studies were eligible for inclusion only if they involved consecutively enrolled patients undergoing isolated periarticular osteotomy of the first metatarsal for hallux rigidus, involved a prospective study design, included some form of objective and subjective data analysis, evaluated patients at a mean follow-up ≥12 months' duration, and included details of complications requiring surgical intervention. Four studies involving 93 isolated periarticular osteotomies of the first metatarsal followed up for a weighted mean of 18.6 months were identified that met the inclusion criteria. Peak dorsiflexion range of motion of the first metatarsophalangeal joint for the entire cohort of 93 patients increased 10.4°. The American Orthopaedic Foot and Ankle Society Hallux Metatarsophalangeal-Interphalangeal Scoring Scale for the entire cohort of 93 patients increased 39 points from a weighted mean of 47.2 preoperatively to 86.2 postoperatively. For the two studies that included it, complete satisfaction or satisfaction with reservations was reported in only 55/75 (73.3%) patients, with the remainder being dissatisfied. A total of 21 (22.6%) procedures underwent surgical revision in the form of hardware removal (n = 8), lesser metatarsal surgery for intractable postoperative metatarsalgia (n = 7), no mention of revision procedure (n = 3), Keller resection arthroplasty (n = 2), and treatment of infection with revision of non-union (n = 1). Two studies specified the grade of hallux rigidus that underwent revision surgery after isolated periarticular osteotomy of the first metatarsal as follows: grade I, 16.7% (n = 3/18) and grade II, 30.5% (n = 18/59). Finally, a total of 30.5% (n = 18/59) of patients developed postoperative metatarsalgia or stress fracture. Additional prospective studies involving validated subjective and objective outcome measurement tools with computerized gait analysis and long-term follow-up after isolated periarticular osteotomy of the first metatarsal for the various grades of hallux rigidus, as well as with comparison with isolated cheilectomy and Valenti arthroplasty, would be beneficial. Based on the high incidence of complications until these studies can be completed, routine use of isolated periarticular osteotomy of the first metatarsal for hallux rigidus should be performed with caution or not at all.

Metatarsalgia

Metatarsalgia (ie, metatarsal pain) is one of the most common reports in patients with foot problems. This pain is confined to the area across the plantar forefoot, including the second through fourth metatarsal heads. However, it is frequently accompanied by deformity of the first and fifth rays as well as of the toes. There is great variability in possible causative factors, but all of them seem to be related to gait mechanics, foot anatomy, and foot and ankle deformity. An individualized treatment protocol is required. Nonsurgical management is usually sufficient to achieve satisfactory results. Surgical correction must be precise, and all pain-producing deformities must be corrected. Most patients present with abnormalities of the distal metatarsals. Metatarsal osteotomy, long a staple of treatment, always fails in the long term. Improved equipment and internal fixation methods may lead to better long-term outcomes.

The opening base wedge osteotomy and subsequent lengthening of the first metatarsal: an in vitro study

Traditionally, the opening base wedge osteotomy has been indicated in a moderate to severe hallux abducto valgus deformity with a short first metatarsal. This in vitro study aimed to address the question of how much lengthening is inherent to the geometric design of an opening wedge in the first metatarsal. The preosteotomy length of a first metatarsal segment was compared with postosteotomy length after performing transverse and oblique basilar osteotomies while maintaining the opening wedge with a prefabricated spacer. In the current bench study, it was found that the opening base wedge osteotomy does indeed lengthen the first metatarsal, albeit a small percentage of the total length (1%-2.8%), and there was no significant difference between the lengths achieved through a transverse or oblique osteotomy based on a confidence interval of 95%.

LEVEL OF CLINICAL EVIDENCE

5.

Screw versus plate fixation of proximal first metatarsal crescentic osteotomy

BACKGROUND

Hallux valgus associated with metatarus primus varus is a deformity that disrupts normal foot function. Standard treatment has often included distal or proximal metatarsal osteotomy with or without a distal soft tissue procedure. The intrinsically unstable proximal crescentic osteotomy relies on operative fixation for stability. This study examined the strength of fixation of a single screw versus a plate for stabilization of proximal first metatarsal crescentic osteotomies for correction of hallux valgus.

MATERIALS AND METHODS

A crescentic osteotomy was performed on nine pairs of fresh/frozen cadaveric feet. The distal fragment was rotated laterally and the osteotomy was temporarily stabilized with a Kirschner wire. The osteotomized metatarsal fragments were fixed with a cancellous screw on one side and single plate on the contralateral side. Each specimen was loaded in a mechanical testing machine, and its response was measured by monitoring the opening of the osteotomy and change in alignment of the fragments. Position and alignment of the proximal and distal fragments were calculated.

RESULTS

All of the measures of fixation strength were statistically greater in specimens treated with a plate rather than with screw fixation. Plate fixation provided approximately twice the resistance to disruption of the osteotomy under cyclic loading conditions.

CONCLUSION

The dorsal plate is biomechanically more stable than a single cancellous screw when applied to proximal crescentic osteotomies.

CLINICAL RELEVANCE

The greater stability of the plate construct may be helpful in selecting the fixation device for these osteotomies.

Changes in length of the first ray with two different first MTP fusion techniques: a cadaveric study

BACKGROUND

First metatarsophalangeal joint (MTP) fusions are performed as salvage procedures for a variety of conditions ranging from osteoarthritis, rheumatoid arthritis, hallux valgus, and failed first MTP arthroplasty. A number of bone preparation techniques have been described to fuse the first MTP joint, with varying degrees of success. The aim of this study was to characterize and compare the average shortening of the first ray with a conical reamer fusion technique versus flat bone cut technique.

MATERIALS AND METHODS

Six paired cadaver feet were divided into two groups with one foot from each pair in each group. Preoperative first ray lengths were measured radiographically. Each group then underwent arthrodesis of first MTP joint with one of two different bone cut techniques: flat cuts or conical reaming. The postoperative lengths of the first rays were measured and the data analyzed using a two-tailed Student's t-tests.

RESULTS

The average shortening that occurred in both groups after the procedure was 7.1 mm for the flat cut group (Group I) and 5.7 mm for the machined conical reaming group (Group II). Comparing both groups, there was no statistically significant difference in the shortening between the groups.

CONCLUSION

Both flat bone cut and conically reamed techniques caused shortening of the first ray after first MTP fusion. However, there was no statistically significant difference in the postprocedure lengths of the first ray between the two groups.

CLINICAL RELEVANCE

Neither technique is more likely to lead to transfer metatarsalgia since the shortening was similar.

Loss of rotator cuff tendon-to-bone interface pressure after reattachment using a suture anchor

The purpose of this study was to examine the tendon-to-bone interface pressure, contact area, and force after reattaching a tendon to bone by use of a suture and suture anchor. Repairs were made in 8 ovine shoulders in vitro, by use of 3 suture types in each: Ethibond, polydioxanone, or Orthocord. A Tekscan pressure sensor was placed between the tendon and bone and monitored for 1 hour after the repair. The principal finding was a significant loss of approximately 60% of the contact parameters immediately after the suture was tied, followed by further significant loss over the next hour to a mean of only 14% of the initial readings. We concluded that pressure measurement systems that only record the initial maximum pressure would yield overly optimistic results for the actual repair pressure after the repair is completed. The Tekscan system, however, allowed us to monitor pressure reductions that occurred both during and after the repair.