Correlation of Clinical Outcomes and Relative Position of the First Metatarsal After the Modified Lapidus Procedure

Background: Hallux valgus is a complex 3-dimensional deformity, and the modified Lapidus is a commonly used procedure to correct moderate to severe cases. Shortening and elevation of the first ray can occur with this procedure, which may result in increased pressure on the lesser metatarsal heads. H...

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Published in:Foot & ankle international 2024-09, Vol.45 (9), p.979-987
Main Authors: Cychosz, Chris C., Mizher, Rami, Digiovanni, Grace M., Jones, Agnes Cororaton, Conti, Matthew S., Ellis, Scott J.
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Mizher, Rami
Digiovanni, Grace M.
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Ellis, Scott J.
description Background: Hallux valgus is a complex 3-dimensional deformity, and the modified Lapidus is a commonly used procedure to correct moderate to severe cases. Shortening and elevation of the first ray can occur with this procedure, which may result in increased pressure on the lesser metatarsal heads. However, there is currently no consensus regarding an accepted length and elevation of the first ray following the modified Lapidus. Therefore, the purpose of this study is to evaluate the impact of the position of the first ray on patient-reported outcome measures. Methods: This retrospective study identified 68 patients (72 feet) who underwent the modified Lapidus bunionectomy over a 4-year period at a single institution with a median follow-up of 24 months (range, 11-35.6 months). Patients were included if they were over 18 years of age, had pre- and postoperative weightbearing computed tomography (WBCT) scans, and preoperative and minimum 1-year postoperative Patient-Reported Outcome Measurement Information System (PROMIS) scores. PROMIS scores from 6 domains including physical function, pain interference, pain intensity, global physical health, global mental health, and depression were evaluated and compared pre- and postoperatively. Radiographic parameters were measured and compared before and after surgery. Paired t tests were used to evaluate the significance of pre- to postoperative changes. Differences between cohorts were compared using Mann-Whitney U test for continuous variables or Fisher exact test for categorical variables. Correlation between radiographic measurements and patient-reported outcomes were assessed using the Spearman rank rho estimate and visualized with scatterplots with a linear regression. Results: PROMIS physical function, pain interference, pain intensity, and global physical health improved significantly following the modified Lapidus (all P 
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Shortening and elevation of the first ray can occur with this procedure, which may result in increased pressure on the lesser metatarsal heads. However, there is currently no consensus regarding an accepted length and elevation of the first ray following the modified Lapidus. Therefore, the purpose of this study is to evaluate the impact of the position of the first ray on patient-reported outcome measures. Methods: This retrospective study identified 68 patients (72 feet) who underwent the modified Lapidus bunionectomy over a 4-year period at a single institution with a median follow-up of 24 months (range, 11-35.6 months). Patients were included if they were over 18 years of age, had pre- and postoperative weightbearing computed tomography (WBCT) scans, and preoperative and minimum 1-year postoperative Patient-Reported Outcome Measurement Information System (PROMIS) scores. PROMIS scores from 6 domains including physical function, pain interference, pain intensity, global physical health, global mental health, and depression were evaluated and compared pre- and postoperatively. Radiographic parameters were measured and compared before and after surgery. Paired t tests were used to evaluate the significance of pre- to postoperative changes. Differences between cohorts were compared using Mann-Whitney U test for continuous variables or Fisher exact test for categorical variables. Correlation between radiographic measurements and patient-reported outcomes were assessed using the Spearman rank rho estimate and visualized with scatterplots with a linear regression. Results: PROMIS physical function, pain interference, pain intensity, and global physical health improved significantly following the modified Lapidus (all P &lt; .001); however, scores did not show any significant correlation with shortening of the first ray up to a maximum shortening of 4.8 mm. The length of the first metatarsal relative to the second decreased by an average of 2.7 mm following the procedure when measured on WBCT (P &lt; .001), and 2.6 mm when measured on plain radiographs (P &lt; .001). No significant elevation of the first ray was observed postoperatively. Conclusion: This study revealed that the Lapidus bunionectomy resulted in significantly improved pain and physical function at short-term follow-up. 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Shortening and elevation of the first ray can occur with this procedure, which may result in increased pressure on the lesser metatarsal heads. However, there is currently no consensus regarding an accepted length and elevation of the first ray following the modified Lapidus. Therefore, the purpose of this study is to evaluate the impact of the position of the first ray on patient-reported outcome measures. Methods: This retrospective study identified 68 patients (72 feet) who underwent the modified Lapidus bunionectomy over a 4-year period at a single institution with a median follow-up of 24 months (range, 11-35.6 months). Patients were included if they were over 18 years of age, had pre- and postoperative weightbearing computed tomography (WBCT) scans, and preoperative and minimum 1-year postoperative Patient-Reported Outcome Measurement Information System (PROMIS) scores. PROMIS scores from 6 domains including physical function, pain interference, pain intensity, global physical health, global mental health, and depression were evaluated and compared pre- and postoperatively. Radiographic parameters were measured and compared before and after surgery. Paired t tests were used to evaluate the significance of pre- to postoperative changes. Differences between cohorts were compared using Mann-Whitney U test for continuous variables or Fisher exact test for categorical variables. Correlation between radiographic measurements and patient-reported outcomes were assessed using the Spearman rank rho estimate and visualized with scatterplots with a linear regression. Results: PROMIS physical function, pain interference, pain intensity, and global physical health improved significantly following the modified Lapidus (all P &lt; .001); however, scores did not show any significant correlation with shortening of the first ray up to a maximum shortening of 4.8 mm. The length of the first metatarsal relative to the second decreased by an average of 2.7 mm following the procedure when measured on WBCT (P &lt; .001), and 2.6 mm when measured on plain radiographs (P &lt; .001). No significant elevation of the first ray was observed postoperatively. Conclusion: This study revealed that the Lapidus bunionectomy resulted in significantly improved pain and physical function at short-term follow-up. 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Shortening and elevation of the first ray can occur with this procedure, which may result in increased pressure on the lesser metatarsal heads. However, there is currently no consensus regarding an accepted length and elevation of the first ray following the modified Lapidus. Therefore, the purpose of this study is to evaluate the impact of the position of the first ray on patient-reported outcome measures. Methods: This retrospective study identified 68 patients (72 feet) who underwent the modified Lapidus bunionectomy over a 4-year period at a single institution with a median follow-up of 24 months (range, 11-35.6 months). Patients were included if they were over 18 years of age, had pre- and postoperative weightbearing computed tomography (WBCT) scans, and preoperative and minimum 1-year postoperative Patient-Reported Outcome Measurement Information System (PROMIS) scores. PROMIS scores from 6 domains including physical function, pain interference, pain intensity, global physical health, global mental health, and depression were evaluated and compared pre- and postoperatively. Radiographic parameters were measured and compared before and after surgery. Paired t tests were used to evaluate the significance of pre- to postoperative changes. Differences between cohorts were compared using Mann-Whitney U test for continuous variables or Fisher exact test for categorical variables. Correlation between radiographic measurements and patient-reported outcomes were assessed using the Spearman rank rho estimate and visualized with scatterplots with a linear regression. Results: PROMIS physical function, pain interference, pain intensity, and global physical health improved significantly following the modified Lapidus (all P &lt; .001); however, scores did not show any significant correlation with shortening of the first ray up to a maximum shortening of 4.8 mm. The length of the first metatarsal relative to the second decreased by an average of 2.7 mm following the procedure when measured on WBCT (P &lt; .001), and 2.6 mm when measured on plain radiographs (P &lt; .001). No significant elevation of the first ray was observed postoperatively. Conclusion: This study revealed that the Lapidus bunionectomy resulted in significantly improved pain and physical function at short-term follow-up. 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title Correlation of Clinical Outcomes and Relative Position of the First Metatarsal After the Modified Lapidus Procedure
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