Does bunion surgery actually narrow the foot?

NewsBot · Apr 21, 2015

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Does bunion surgery actually narrow the foot? Assessment of outcomes of surgery using traditional angles and a new radiographic measure of severity- the forefoot: hindfoot ratio. Correlation with clinical outcomes
Sarah Curran, Ashok Marudanayagam, Laura Beddard and Anthony Perera
Journal of Foot and Ankle Research 2015, 8(Suppl 1):A15 doi:10.1186/1757-1146-8-S1-A15

Background
Various angles have been used to grade the severity of hallux valgus deformity. They are useful in surgical planning but do not correlate with symptom severity or improvement. We feel that there is a fundamental mismatch between the width of the forefoot and the width of the hindfoot and that this is more clinically relevant, we describe two techniques for measuring this. We aim to measure the degree of foot narrowing after surgery and moreover how this correlates to the severity of pre- and post operative outcomes.

Methods
200 consecutive bunion operations were assessed with weight bearing radiographs. The HVA and IMA were measured according to standard practice. We also assessed forefoot width using two methods we have described. The first is the ‘Forefoot Width’ measured as a perpendicular to the midfoot (a technique we have previously validated). The ‘Foot Ratio’ is calculated as a function of the calcaneal width. Clinical outcomes were assessed using the Manchester Oxford Foot Questionnaire (MOXFQ), American Orthopaedic Foot and Ankle Surgeons (AOFAS) questionniare.

Results
Bunion surgery narrows the osseous width of the forefoot. This narrowing can be by as much as 23mm in cases with severe deformity. We found that the Forefoot: Hindfoot ratio correlated with symptom severity and that normalisation of the ratio to below 2.5 was associated with better outcomes. This is important as small absolute corrections were associated with good outcomes.

Conclusion
Our measure of Forefoot Width is reproducible and allows for variations such as forefoot adductus. We feel that the Forefoot:Hindfoot ratio is more important as this determines the ability to fit into off-the-shelf footwear rather than requiring bespoke or modified footwear. This is the first study to look at the ability to narrow the forefoot and has important implications in determining patient selection and post-operative outcomes.
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NewsBot · Jun 28, 2016

Footwear modification following hallux valgus surgery: The all-or-none phenomenon
Cal Robinson, Abhijit Bhosale, Anand Pillai
World J Methodol 2016; 6(2): 171-180

AIM: To define footwear outcomes following hallux valgus surgery, focusing on patient return to comfortable and heeled footwear and patterns of post-operative footwear selection.
METHODS: Surgical intervention is indicated for symptomatic cases of hallux valgus unresponsive to conservative methods, with favourable reported out?comes. The return to various types of footwear post-operatively is reflective of the degree of correction achieved, and corresponds to patient satisfaction. Patients are expected to return to comfortable footwear post-operatively without significant residual symptoms. Many female patients will additionally attempt to return to high-heeled, narrow toe box shoes. However, minimal evidence exists to guide their expectations. Sixty-five female hallux valgus patients that had undergone primary surgery between 2011 and 2013 were retrospectively identified using our hospital surgical database. Patients were reviewed using a footwear-specific outcome questionnaire at a mean 18.5 mo follow-up.
RESULTS: Eighty-six percent of patients were able to return to comfortable footwear post-operatively with minimal discomfort. Of those intending to resume wearing heeled footwear, 62% were able to do so, with 77% of these patients wearing these as or more frequently than pre-operatively. No significant difference was observed between pre- and post-operative heel size. Mean time to return to heeled footwear was 21.4 wk post-operation. Cosmetic outcomes were very high and did not adversely impact footwear selection.
CONCLUSION: We report high rates of return to both comfortable and heeled shoes in female patients following primary hallux valgus surgery. We observed an “all-or-none phenomenon” where patients rejected a return to heeled footwear unless able to tolerate them at the same frequency and heel size as pre-operatively. A minority of patients were unable to return to comfortable footwear post-operatively, which had adverse ramifications on their quality-of-life. We recommend that the importance of managing patient expectations through appropriate pre-operative counselling be emphasized in forefoot surgery.
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NewsBot · Jun 30, 2018

Foot Width Changes Following Hallux Valgus Surgery.
Tenenbaum SA et al
Foot Ankle Int. 2018 Jun 1:1071100718783458.

BACKGROUND:
Hallux valgus (HV) adversely affects quality of life. Patients frequently express concerns regarding postoperative foot appearance, foot width and footwear anticipations. However, only scarce data are available regarding postoperative foot width.

MATERIALS AND METHODS:
Seventy-one cases with moderate to severe HV treated with scarf osteotomy were included. The average age was 55.7 years (range, 20-76), with average follow-up of 20.7 months (range, 6-96). Patients' medical records were reviewed for demographic, operative, and radiographic data. Foot width was assessed radiographically by measuring both bone (distance between the first and fifth metatarsal heads) and soft tissue width (maximal distance of the soft tissue outline).

RESULTS:
Preoperative HV deformity (mean hallux valgus angle [HVA] 35.8 degrees, intermetatarsal angle [IMA] 14.1 degrees, and distal metatarsal articular angle [DMAA] 15.2 degrees) was successfully corrected (postoperative mean HVA 13.7 degrees, IMA 6.9 degrees, and DMAA 7.7 degrees). Overall bony foot width was reduced by 5% and soft tissue foot width by 2%. Further analysis showed that 13 feet (18.3%) had increased (>5%) bone width, 26 feet (36.6%) with no change (±5%), and 32 feet (45.1%) for which the width decreased (>5%) postoperatively. Angular deformity (HVA, IMA, and DMAA) showed low correlation with postsurgery foot width.

CONCLUSION:
HV surgery effect on foot width was very limited, overall reducing foot width by 2%. Furthermore, in only about half of the patients, the postoperative foot width decreased, regardless of angular deformity magnitude. Patients with the widest feet had a decrease in foot width following surgery, whereas patients with the narrowest feet had an increase in foot width.
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NewsBot · Apr 10, 2019

Does Hallux Valgus Correction Reduce the Width of the Forefoot?
Panchbhavi V et al
Foot Ankle Spec. 2019 Apr 8

BACKGROUND:
Hallux valgus has been associated with a widened forefoot. Most surgical procedures for the correction of hallux valgus have the potential to reduce forefoot width. Success after hallux valgus surgery is correlated with relief of toe pain in conventional shoes and improvement in the appearance of the foot. Therefore, reduction in forefoot width, referred to as metatarsal span (MS), likely correlates with both criteria and may be a reliable radiographic indicator of success after hallux valgus surgery.

METHODS:
Preoperative and postoperative radiographs of 52 patients who underwent correction of hallux valgus with a distal Chevron osteotomy and Akin osteotomy were evaluated by 4 observers. The observers measured the hallux valgus angle (HVA), the intermetatarsal first and second angle (IMA), and the MS.

RESULTS:
Preoperative HVA ranged from 14° to 48°, IMA ranged from 6° to 25°, and MS ranged from 74.2 to 110.6 mm. The average HVA improvement was 19.4°, IMA improvement was 6.7°, and MS reduction was 8.7 mm. No correlation was identified with regard to correction of the HVA or IMA to MS.

CONCLUSION:
Digital radiographic linear measurements were easily and reliably made. Therefore, linear measurements as described in this article can be used as a tool to evaluate if clinical outcomes correlate with reduction of MS. A distal Chevron with an Akin osteotomy has the potential to reduce forefoot width.
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NewsBot · Oct 31, 2019

Effect of the Modified Lapidus Procedure for Hallux Valgus on Foot Width
Matthew S. Conti, MD, Aoife MacMahon, BA, Scott J. Ellis, MD, ...
Foot & Ankle International October 30, 2019

Background:
Despite the importance of shoe wear to patients with hallux valgus (HV), few studies have investigated changes in foot width following surgery in this population. The purpose of our study was to determine if the modified Lapidus procedure would effectively decrease foot width in patients with HV.

Methods:
Thirty-one feet (19 left, 12 right) in 30 patients (29 females, 1 male) who underwent a modified Lapidus procedure in combination with a modified McBride and Akin osteotomy for treatment of HV were included in the study. All patients had preoperative and at least 5-month postoperative imaging, consisting of both weightbearing radiographs and computed tomography (WBCT) scans, which were used to measure bony and soft tissue foot widths pre- and postoperatively by 2 independent observers.

Results:
Intraclass correlation coefficients (ICCs) demonstrated high interobserver reliability (all ICCs >0.90). Bony foot width decreased significantly, by a mean of 8.9 mm (9.1%) on radiographs and 7.9 mm (8.4%) on WBCT scans (P < .001). The soft tissue foot width also decreased significantly, by a mean of 6.9 mm (6.3%) on radiographs and 6.7 mm (6.4%) on WBCT scans (P < .001). Changes in the hallux valgus angle and intermetatarsal angle correlated with changes in bony foot width on WBCTs (both r > 0.4, P < .02).

Conclusions:
The modified Lapidus procedure in combination with a modified McBride and Akin osteotomy resulted in statistically significant changes in both bony and soft tissue foot width. Patients should be counseled that foot width decreases, on average, by 0.5 to 1 cm.
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NewsBot · Feb 13, 2023

Radiographic Forefoot Width Following Minimally Invasive Chevron Akin Bunionectomy
Derek M Klavas et al
Foot Ankle Orthop. 2023 Jan 23;8(1)

Background: Hallux valgus (HV) is a common cause of pain and deformity of the forefoot. Minimally invasive chevron Akin (MICA) bunionectomy is a method for HV correction associated with less pain and swelling, with early return to weightbearing in a regular shoe. The purpose of this study was to determine how the MICA procedure affects forefoot width.

Methods: Twenty-eight patients (26 female, 2 male; 9 left, 19 right) at a single institution who underwent primary MICA for HV correction by 3 treating surgeons were retrospectively reviewed. Pre- and postoperative hallux valgus angle (HVA), intermetatarsal angle (IMA), distal metatarsal articular angle (DMAA), bony forefoot width, and soft tissue forefoot width were measured by 2 independent observers. Radiographic measurements were calibrated using fifth metatarsal length. Wilcoxon signed rank test compared changes in HVA, IMA, DMAA, and forefoot widths. Pearson correlation coefficient evaluated association between HVA, IMA, DMAA, and changes in forefoot width.

Results: At mean follow-up of 5.4 (range 3-13.7) months, bony forefoot width decreased significantly by 3.7 mm (4%, P < .001) and soft tissue forefoot width decreased by 2.5 mm (2%, P < .01). Decrease in HVA was moderately correlated with change in bony forefoot width (r = .38, P < .05) and change in soft tissue forefoot width (r = .45, P < .05). Decrease in IMA was moderately correlated with change in bony forefoot width (r = .45, P < .05) and change in soft tissue forefoot width (r = .44, P < .05).

Conclusion: The MICA procedure resulted in modest, yet significant, decrease in both bony and soft tissue forefoot width. Decrease in HVA and IMA demonstrated moderate correlation with changes in forefoot width. Patients can be counseled on these changes leading up to, and after, MICA bunionectomy surgery.
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NewsBot · Apr 14, 2023

Hallux Valgus Repair with Chevron Osteotomy Significantly Narrows Forefoot Width
Raphael Lotan et al
J Clin Med. 2023 Mar 30;12(7):2607

Background: Hallux valgus (HV) is a common adult foot deformity. There is uncertainty concerning the effect of HV surgery on foot width. We examined the effect of chevron first metatarsal osteotomy on forefoot width using calibrated pre and postoperative standing radiographs.

Methods: A retrospective cohort of 50 patients underwent chevron osteotomy HV surgery. All had HVA > 30°, IMA > 11°, DMMA > 3°, >6-month follow-up, and calibrated pre and postoperative standing foot radiographs. Bony width (BW) and soft tissue width (STW) were used to measure the surgery's effect on foot width. Measurements were made preoperatively and 3-6 months following surgery.

Results: The study group included 42 women with an average age of 63.4 (±8.3) and a mean BMI of 28.7 (±4.9). Preoperative HVA and IMA were 31.7° (±6.8°) and 13.4° (±2.8°), respectively. Following surgery, HVA and IMA improved significantly, by 15.6° (±5.7°) and 8.7° (±2.3°), respectively. The preoperative average BW was 9.4 cm (±0.6), and the STW was 10.6 cm (±0.7). Following surgery, significant changes in BW and STW were measured, with a mean narrowing of 1.2 cm (±0.4) in BW (p < 0.001) and 0.95 cm (±0.5) in STW (p < 0.001). Paradoxically, an increase in age led to a lower correction of the IMA (p = 0.04, r = 0.57), but higher BW and STW reductions (p = 0.01, r = 0.35 and p = 0.008, r = 0.37, respectively).

Conclusions: This study reinforced chevron osteotomy as a valid treatment option that significantly narrows forefoot width; it is thus expected to improve cosmetic outcomes, shoe selection options, and quality of life. This study also found that older age correlates with better forefoot narrowing following hallux valgus repair, possibly due to stiffer soft tissues.
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