Hallux Valgus Correction With Rotational Scarf Combined With Adductor Hallucis Tendon Transposition

Classification of hallux valgus deformity-is there a standard?

INTRODUCTION

Hallux valgus deformity severity is one determent for the surgical procedure for hallux valgus (HV) correction. HV deformities are usually classified into mild/moderate/severe. The aim was to investigate the cut-off criteria used to classify HV deformity.

MATERIALS AND METHODS

The study was based on a previous living systematic review. Four common databases were searched for the last decade. All review-steps were conducted by two reviewers. Data assessed were the individual cut-off values used to classify HV deformity into mild/moderate/severe, and the referenced classification systems.

RESULTS

46 studies were included. 21/18 studies grade deformity based on the intermetatarsal angle (IMA)/ hallux valgus angle (HVA) with great heterogeneity throughout the different cut-off values. The most referenced classification systems were the Coughlin and Mann's and the Robinson classification.

CONCLUSIONS

The currently used classification systems are heterogenic, and no standard could be defined. The community should define a uniform classification system.

LEVEL OF EVIDENCE

Level I, systematic review of randomized controlled trials and prospective comparative studies.

Correction potential and outcome of various surgical procedures for hallux valgus surgery: a living systematic review and meta-analysis

INTRODUCTION

More than 100 surgical techniques are described for hallux valgus (HV) correction, but the most appropriate technique remains debatable. The aim of this study was to develop and conduct a "living systematic review" for the outcome of surgically treated HV.

MATERIALS AND METHODS

The "living systematic review" was conducted per the PRISMA-P and PICOS guidelines and is the basis for the German AWMF S2e guideline "Hallux valgus" (033-018). Four common databases and the grey-literature were searched. Eligible were studies on adult patients comparing either two different primary surgical interventions or the same primary surgical intervention for different hallux valgus severities. The main outcome parameters were the osseous correction potential and the patient rated outcome.

RESULTS

Out of 3022 studies, 46 studies (100 arms) were included. The meta-analysis included 31 studies (53 arms). The IMA (1933 procedures) improved on average by 7.3°, without significant group differences. The HVA (1883 procedures) improved on average by 18.9°, with significantly better results for third generation MIS (21.2°). The AOFAS (1338 procedures) improved on average by 33.8 points without significant group differences. The meta-regression revealed constant AOFAS scores over time. 69%/39% of the correction potential for the IMA/HVA could be explained by the preoperative values and 82% of the AOFAS improvement by the preoperative AOFAS scores.

CONCLUSION

Open and minimally invasive techniques are powerful tools to correct hallux valgus deformity. Third generation MIS procedures revealed a possible superiority for the correction of the HVA. The AOFAS improvement appeared to be constant over time.

LEVEL OF EVIDENCE

Level I; living systematic review and meta-analysis of prospective comparative studies (level II) and randomized controlled trials (level I).

Patient-reported outcome measures in studies on hallux valgus surgery: what should be assessed

INTRODUCTION

In recent years, there has been an increasing demand for patient-reported outcome measures (PROMs) to assess the outcome following orthopedic surgery. But, we are lacking a standard set of PROMs to assess the outcome of hallux valgus surgery. The aim of this study was to analyze the chosen patient rated outcome scores used in studies reporting on hallux valgus surgery.

MATERIALS AND METHODS

The study was based on a previously published living systematic review. Included were prospective, comparative studies of different surgical procedures or the same procedure for different degrees of deformity. Four common databases were searched for the last decade. Study selection, data extraction, and risk of bias assessment were made by two independent reviewers. Data assessed were the individual PROMs used to assess the outcome of hallux valgus surgery.

RESULTS

46 studies (30 RCTs and 16 non-randomized prospective studies) met the inclusion criteria. The most commonly used clinical outcome measures were the AOFAS (55%) and the VAS (30%). No differences were found between frequency of the individual scores per the level of evidence or the type of osteotomy.

CONCLUSION

Based on a systematic literature review, the AOFAS and VAS are the most frequently used outcome tools in studies assessing the outcome following hallux valgus surgery. Based on the literature available, the MOXFQ is a more valid alternative.

LEVEL OF EVIDENCE

Level I; systematic review of prospective comparative (level II) and randomized controlled trials (level I).

How Adductor Hallucis Reattachment Affects Outcomes Following Scarf Osteotomy in Hallux Valgus Correction: A 4- to 8-Year Follow-Up Retrospective Comparative Study

This study observed the differences between 2 adductor hallucis release techniques (nonreattachment vs reattachment) in 4- to 8-year follow-up outcomes of scarf osteotomy combined with distal soft tissue release (DSTR) in moderate to severe hallux valgus correction. A retrospective review of moderate to severe hallux valgus patients treated with scarf osteotomy with DSTR was conducted. The patients were divided into 2 groups based on adductor hallucis release techniques (without and with reattachment to the metatarsophalangeal joint capsule). The demographic-matching process divided the samples into 27 patients per group. A comparison of last follow-up of clinical foot ankle ability measure (FAAM) for activity of daily living (ADL) and numerical rating scale for pain during 2 hours of ADL and radiographic outcomes (hallux valgus angle (HVA) and intermetatarsal angle (IMA) was analyzed. A p < .05 was considered a statistically significant difference. The final follow-up of FAAM for ADL was statistically better in the reattachment group as the median was 79.0 (IQR = 4.00) versus 76.0 (IQR = 4.00), p = .047. However, this difference did not achieve minimal clinical importance difference (MCID). The last follow-up of IMA was also statistically better in the reattachment group as the mean was 7.67 (SD = 3.10) versus 10.5 (SD = 3.59), p = .003. DSTR with adductor hallucis reattachment has statistically better IMA correction and maintenance than nonreattachment for moderate to severe hallux valgus correction using scarf osteotomy at 4- to 8-years follow-up. However, the better clinical outcomes did not achieve MCID.

Investigation on the site of coronal deformities in Hallux valgus

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

Modified scarf osteotomy for hallux valgus: From a finite element model to clinical results

PURPOSE

Finite element (FE) analysis and clinical follow-up were used to evaluate the efficacy of modified scarf osteotomy for moderate-to-severe hallux valgus (HV).

METHOD

We retrospectively evaluated 42 patients (44 feet) who underwent modified rotational scarf osteotomy for moderate-to-severe HV at our institution between January 2010 and January 2019. Radiological indicators and subjective scores were recorded at different time points. To compare the results and elemental characteristics, a FE model of the metatarsophalangeal (MTP) joint that included anatomically realistic geometrical and structural characteristics was built. The biomechanical features and correction differences in dynamic loads as well as the incidence of troughing were estimated.

RESULTS

Both the hallux valgus angle (HVA) and intermetatarsal angle (IMA) showed significant improvement 6 weeks postoperatively (p < 0.05); additionally, the HVA increased from 6 weeks postoperatively to the last follow-up, while the IMA showed no significant changes (p > 0.05). The subjective scores significantly improved from the preoperative period to the last follow-up. The percentages of troughing and recurrence were remarkably low in our pilot study because of the innate stability of the modified rotated fixation.

CONCLUSION

Our preliminary findings suggest that modified rotational scarf osteotomy offers sufficient stability, correct HV deformity effectively, and good clinical outcomes for moderate to severe HV.

The Incidence of Complications Following Scarf Osteotomy for the Treatment of Hallux Valgus: A Systematic Review with Meta-Analysis

The Scarf osteotomy is a surgical procedure performed to correct a hallux valgus deformity. Multiple studies have supported use of the procedure with favorable outcomes. In contrast, there have been studies showing a significant complication rate with the procedure. Incidence of complications remains underreported in the literature. We performed a systemic review and meta-analysis examining a wide range of reported complications and associated clinical outcomes from the Scarf osteotomy. One hundred and sixteen publications were identified and 25 (21.6%) met our inclusion criteria. A total of 1583 Scarf procedures were included. Weighted mean follow-up was 26.4 months [range 12-168 months]. We found a 5.1% rate of recurrence, 3.5% rate of troughing, 1.0% rate of avascular necrosis, 1.8% rate of nonunion, 2.7% rate of malunion, 2.4% rate of infection, 5.3% rate of complex regional pain syndrome, and 3.4% rate of hallux varus. An average decrease in intermetatarsal angle of 6.3° was observed. No statistical difference was found in outcomes when comparing Scarf versus Scarf with additional procedure performed at time of surgery. To our knowledge, this systematic review and meta-analysis contains the highest number of Scarf procedures analyzed and presents complication rates on multiple adverse outcomes.

Pes Planus Deformity and Its Association With Hallux Valgus Recurrence Following Scarf Osteotomy

BACKGROUND

Hallux valgus recurrence is an unsatisfactory complication, with many causes postulated. This study investigated the effect of pes planus on recurrence after scarf osteotomy.

METHODS

A total of 183 feet were retrospectively reviewed. All patients were treated with a scarf osteotomy and if required Akin osteotomy. We measured preoperative lateral talus first metatarsal angle (T1MA) to study pes planus; an angle of under -4 degrees was considered pes planus. We measured pre and postoperative hallux valgus angle (HVA), intermetatarsal angle (IMA), and sesamoid location. In total 164 feet were suitable for inclusion, with follow-up of at least 6 months (10 males and 154 females, mean age: 52 years).

RESULTS

Recurrence frequency (HVA greater than 15 degrees) was 27 feet (16%). Hallux valgus recurrence was not influenced by gender (P value = .66) or preoperative IMA (P value = .48). Preoperative HVA greater than 35 degrees was associated with increased frequency of recurrence (P value = .004). Those with T1MA less than -10 degrees demonstrated progression in HVA and deterioration in sesamoid location up to 6 months postoperatively (P value = .038). HVA did not progress beyond 6 months. The prevalence of recurrent hallux valgus with normal T1MA was 1%, in T1MA -4 to -10 degrees it was 29% and in T1MA less than -10 degrees it was 47% (P value <.001). Breaks in T1MA less than -4 degrees were found at the naviculocuneiform joint in 68% of feet in this series.

CONCLUSION

The prevalence of hallux valgus recurrence correlated with the severity of pes planus.

LEVEL OF EVIDENCE

Level III, retrospective cohort study.