Category: Lesser Toes; Hindfoot Introduction/Purpose: Distal metatarsal osteotomies for metatarsalgia are one of the most frequent procedures in foot and ankle surgery, however, sometimes their results are not so favorable, with sequelae such as floating toe or loss of toe grip. The open modified Weil osteotomy (OWO) is considered the first alternative in metatarsalgia cases for many surgeons, nevertheless, in recent years, minimally invasive surgery (MIS) has become an attractive alternative for the management of this pathology. To date, there is scarce literature that compares clinical and functional results between both techniques. The objective of this study is to compare the clinical and functional outcomes between OWO and minimally invasive distal metatarsal osteotomy (DMMO), with and without lesser toe procedures. Methods: We performed a retrospective review of 77 patients who underwent OWO or DMMO, with at least 12 month follow up. We excluded patients with incomplete data, previous forefoot surgery, and patients with neuromuscular or rheumatological diseases. Our main outcome was to evaluate the presence of floating toe. Our secondary outcomes were to evaluate toe grip strength (paper pullout test), functional scores (LEFS and AOFAS) and satisfaction. All patients were clinically evaluated by one foot and ankle surgeon who did not participate in any of the surgical procedures. Statistical analysis was performed using Student's t-test, Fisher's test, and Chi-square. Results: 77 patients (188 rays) were included. 120 rays received OWO, and 68 rays DMMO. 95% women, with a mean age of 57 years. The mean follow-up was 39.4 months. The floating toe incidence was 56.7% in the OWO group (67.3% when a DuVries procedure was added), which was significantly higher (p=0.001) than the 25% in the DMMO group (37.9% when P1 MIS osteotomy was added). When comparing lesser toe grip strength between both groups, the DMMO patients had significantly greater grip strength (p=001) Significant differences were obtained between both groups when comparing satisfaction (p=0.04), LEFS (p=0.001), and AOFAS scores (p=0.001), being better in the DMMO group. Conclusion: In our series, the DMMO procedure had significantly lower incidence of floating toe, greater toe grip strength, better functional outcomes and superior satisfaction scores than the OWO. When a bone procedure in the lesser toe is added (MIS osteotomy or DuVries) the floating toe incidence is increased, but not with statistical significance.

Category: Basic Sciences/Biologics; Bunion Introduction/Purpose: Hallux valgus minimally invasive surgery (MIS) is becoming more common due to its good clinical and functional results. Third-generation MIS surgery uses screw fixation that is dependent on the bone density of the first metatarsal head (FMH) for optimal screw purchase. There is no information regarding areas of higher bone density (BMD) in the FMH that suggest a stronger area of fixation, nor has it been described whether it varies between different age groups or with gender. The objective of this study is to determine the BMD within four quadrants of the FMH. This finding could lead to identifying the ideal trajectory for screw placement. In addition, we evaluate BMD variation by age and gender. Methods: Transversal study. From our CT scan database, we obtained 40 patients with no previous history of first metatarsal fractures, pre existing hardware, foot surgery or osteoporosis. We divided the patients into 4 groups, each group containing 5 male and 5 female patients: group 1: <30 years, group 2: 31-45 years, group 3: 46-60 years, group 4: > 60 years. The main outcome is to evaluate the association between BMD in each FMH quadrant. Secondary outcomes are to identify any differences in BMD between gender and age groups. According to what has been previously discussed in the literature, two evaluators measured the Hounsfield units (HU) of each quadrant on a coronal cut located 10 mm proximal to the metatarsophalangeal joint using the Merge PACS system. Measures were averaged. Statistical analysis was performed by measuring normality with the Shapiro-Wilks test, and the ANOVA, Student's t-test, and Mann-Whitney U test. Results: The dorsolateral (DL) quadrant had the highest BMD (353.9hu) of all quadrants, followed by the lateral plantar (LP: 302.4hu), medial plantar (MP: 264.1hu), and dorsomedial (DM: 247.6hu) (p=0.001).When comparing the groups by age, DL (p=0.01) and LP (p=0.01) quadrants had significantly greater BMD in groups 1 and 2 (< 45 years) than groups 3 and 4 (> 45 years).When comparing BMD by gender, differences were only obtained in the group 4, in which mens had greater BMD in the DM (p=0.03), DL (p=0.02), and LP (p=0.01) quadrants.An significant inverse association between age and BMD was obtained for the DL (P=0.004) and MP (P=0.03) quadrants. Conclusion: There are differences in BMD between the quadrants of the first metatarsal head, with the greatest BMD being in the dorsolateral region at any age. BMD decreased proportionally with increasing age in the DL and MP quadrants. At the same age, there are no significant differences between gender, except in patients >60 years, where women have lower BMD in almost all quadrants.

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