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Sustentaculum Tali Screw Fixation Mode and Postoperative Foot-Ankle Function in Calcaneal Fractures

2026年9月12日 更新者:Zhou Fang、Peking University Third Hospital

Impact of Sustentaculum Tali Screw Fixation Mode on Radiographic and Functional Outcomes in Patients With Intra-Articular Calcaneal Fractures: An Ambidirectional Cohort Study

This is an observational, ambidirectional cohort study. Calcaneal fractures are the most common tarsal bone fractures, and most are intra-articular fractures involving the subtalar joint. Surgery with open reduction and internal fixation is the standard treatment for displaced intra-articular calcaneal fractures. During surgery, a sustentaculum tali screw is placed from the lateral wall of the calcaneus toward the medial side to support the reduced posterior articular surface. Depending on the screw tip position, fixation is classified as sustentaculum tali fixation (ST; screw fixed directly into the sustentaculum tali) or sustentaculum tali fragment fixation (STF; screw fixed into the larger medial fragment containing the sustentaculum tali). This study compares radiographic reduction quality, foot and ankle function, and complications between these two fixation groups. Approximately 92 participants with intra-articular calcaneal fractures will be enrolled, retrospectively from January 2015 to August 2026 and prospectively from September 2026. The fixation mode is determined on postoperative X-rays. Outcomes, including the Maryland Foot Score, the AOFAS ankle-hindfoot score, Böhler's angle, Gissane's angle, calcaneal height and width, and complications, will be compared between groups over at least 12 months of follow-up. No randomization is performed and no treatment is altered by this study.

調査の概要

状態

まだ募集していません

条件

介入・治療

詳細な説明

Background: Calcaneal fractures account for approximately 1% to 2% of all fractures and are the most common tarsal bone fractures, usually caused by high-energy injuries such as falls from height and motor vehicle accidents. Most are intra-articular fractures involving the subtalar joint. Open reduction and internal fixation is the mainstay of treatment for displaced intra-articular calcaneal fractures, aiming to restore the congruity of the subtalar articular surface and the normal morphology of the calcaneus.

The sustentaculum tali is a bony prominence on the medial side of the calcaneus that forms the middle facet of the subtalar joint. Because of its dense bone and strong ligamentous attachments, it is a key anchor point for fracture reduction and internal fixation. During surgery via a lateral approach, a sustentaculum tali screw is inserted from the lateral wall toward the medial side to provide stable support for the reduced posterior articular surface.

Depending on the screw tip position on postoperative imaging, fixation is classified as sustentaculum tali fixation (ST; screw penetrates within the range of the sustentaculum tali) or sustentaculum tali fragment fixation (STF; screw is fixed into the larger medial fragment containing the sustentaculum tali, with the penetration point outside the sustentaculum tali range). Because the sustentaculum tali is small and irregularly shaped, accurate screw placement is technically demanding, with reported accuracy of only 60% to 80% even among experienced surgeons. Recent studies suggest that fixation into the sustentaculum fragment may achieve clinical outcomes similar to precise sustentaculum tali fixation; however, the effect of the different fixation modes on postoperative foot and ankle function remains insufficiently investigated.

Design and methods: This is an ambidirectional cohort study. Approximately 92 participants with intra-articular calcaneal fractures treated by open reduction and internal fixation will be enrolled, including retrospective cases from January 2015 to August 2026 and prospective cases from September 2026. Participants will be naturally allocated to the ST or STF group according to the fixation mode determined on postoperative lateral and axial X-rays; no randomization is performed and no treatment plan is altered by the study.

Data are collected during routine clinical follow-up at 1 week, 6 weeks, 12 weeks, 24 weeks, and 1 year after surgery; no additional examinations or interventions are required. Radiographic parameters (Böhler's angle, Gissane's angle, calcaneal height and width) are measured on pre- and postoperative X-rays, and functional outcomes are assessed with the AOFAS ankle-hindfoot score and the Maryland Foot Score at least 12 months postoperatively.

Statistical analysis: Continuous variables will be compared using the t-test or the Wilcoxon rank-sum test according to their distribution, and categorical variables will be compared using the chi-square test. Two-sided P < 0.05 will be considered statistically significant. Multivariable regression may be used to adjust for potential confounders where appropriate. Analyses will be performed with SPSS 26.0 (IBM, Armonk, NY, USA).

研究の種類

観察的

入学 (推定)

92

連絡先と場所

このセクションには、調査を実施する担当者の連絡先の詳細と、この調査が実施されている場所に関する情報が記載されています。

研究連絡先

  • 名前:Clinical Trial Office
  • 電話番号:010-82266699
  • メール:bysy@bjmu.edu.cn

研究場所

    • Beijing Municipality
      • Beijing、Beijing Municipality、中国、100191
        • Peking University Third Hospital
        • コンタクト:
          • Clinical Trial Office
          • 電話番号:010 82266699
          • メール:bysy@bjmu.edu.cn

参加基準

研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。

適格基準

就学可能な年齢

  • 大人
  • 高齢者

健康ボランティアの受け入れ

いいえ

サンプリング方法

非確率サンプル

調査対象母集団

The study population consists of adults with intra-articular calcaneal fractures who underwent open reduction and internal fixation at Peking University Third Hospital. Retrospective cases will be identified from January 2015 to August 2026, and prospective cases will be enrolled from September 2026 onward. Participants will be classified into the ST or STF group according to screw tip position on postoperative lateral and axial X-rays. Approximately 92 participants are expected. No treatment is assigned by the study; all participants receive routine clinical care.

説明

Inclusion Criteria:

- Adults aged ≥ 18 years.

Diagnosis of intra-articular calcaneal fracture.

Treated with open reduction and internal fixation (ORIF).

Availability of postoperative lateral and axial X-rays for assessment of screw tip position.

Complete medical records for retrospective data collection, or willingness to participate in prospective follow-up.

Written informed consent for prospective participants; informed consent waived for retrospective participants as approved by the ethics committee.

Exclusion Criteria:

- Pathological fractures.

Open calcaneal fractures.

Previous surgery on the affected calcaneus.

Severe medical conditions that may affect follow-up or functional assessment.

Inability to complete follow-up or functional questionnaires.

Lack of adequate imaging or medical records for group allocation.

Patients who declined to participate (for prospective cases).

研究計画

このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。

研究はどのように設計されていますか?

デザインの詳細

コホートと介入

グループ/コホート
介入・治療
Sustentaculum Tali (ST) Fixation
Participants with intra-articular calcaneal fractures treated with open reduction and internal fixation. The exposure of interest is screw tip position: the sustentaculum tali screw penetrates within the range of the sustentaculum tali on postoperative lateral and axial X-rays. No treatment was assigned by the study; all participants received routine clinical care.
Postoperative screw tip position on lateral and axial X-rays, classified as either ST (within the sustentaculum tali) or STF (in the larger medial fragment, outside the sustentaculum tali range). This is the exposure of interest; the study does not assign this exposure.
Sustentaculum Tali Fragment (STF) Fixation
Participants with intra-articular calcaneal fractures treated with open reduction and internal fixation. The exposure of interest is screw tip position: the screw is fixed into the larger medial fragment containing the sustentaculum tali, with the penetration point outside the sustentaculum tali range on postoperative lateral and axial X-rays. No treatment was assigned by the study; all participants received routine clinical care.
Postoperative screw tip position on lateral and axial X-rays, classified as either ST (within the sustentaculum tali) or STF (in the larger medial fragment, outside the sustentaculum tali range). This is the exposure of interest; the study does not assign this exposure.

この研究は何を測定していますか?

主要な結果の測定

結果測定
メジャーの説明
時間枠
Maryland Foot Score
時間枠:At least 12 months postoperatively
A validated 100-point scoring system for assessing foot function after injury. Domains include pain, gait, distance walked, stability, support, limp, and wearing shoes. Higher scores indicate better function. Score categories: Excellent 90-100; Good 75-89; Fair 50-74; Failure <50.
At least 12 months postoperatively
AOFAS Ankle-Hindfoot Score
時間枠:At least 12 months postoperatively
A validated 100-point scoring system for assessing ankle and hindfoot function. Comprises three domains: pain (40 points), function (50 points), and alignment (10 points). Higher scores indicate better function. Score categories: Excellent 90-100; Good 80-89; Fair 65-79; Poor <65.
At least 12 months postoperatively

二次結果の測定

結果測定
メジャーの説明
時間枠
Change in Böhler's Angle
時間枠:Preoperative, immediate postoperative, and at least 12 months postoperatively
Change in Böhler's angle measured on lateral X-rays. Böhler's angle is formed by the intersection of a line from the highest point of the anterior process to the highest point of the posterior facet and a line from the highest point of the posterior facet to the superior margin of the calcaneal tuberosity. Normal range is approximately 20°-40°. A decrease indicates loss of calcaneal height and posterior facet collapse.
Preoperative, immediate postoperative, and at least 12 months postoperatively
Change in Gissane's Angle
時間枠:Preoperative, immediate postoperative, and at least 12 months postoperatively
Change in Gissane's angle measured on lateral X-rays. Gissane's angle is formed at the intersection of the downward and upward slopes of the calcaneal superior surface, located beneath the lateral process of the talus. Normal range is approximately 120°-140°. An increase indicates architectural disruption of the posterior facet.
Preoperative, immediate postoperative, and at least 12 months postoperatively
Change in Calcaneal Height
時間枠:Preoperative, immediate postoperative, and at least 12 months postoperatively
Change in calcaneal height measured on lateral X-rays from preoperative to postoperative and final follow-up. A decrease in calcaneal height indicates collapse of the fractured calcaneus.
Preoperative, immediate postoperative, and at least 12 months postoperatively
Change in Calcaneal Width
時間枠:Preoperative, immediate postoperative, and at least 12 months postoperatively
Change in calcaneal width measured on axial X-rays from preoperative to postoperative and final follow-up. An increase in calcaneal width indicates lateral wall bulging after fracture.
Preoperative, immediate postoperative, and at least 12 months postoperatively
Postoperative Complications
時間枠:Up to 12 months postoperatively
Number of participants with postoperative complications, including wound infection, screw loosening, sural nerve injury, and other surgery-related adverse events. Complications will be recorded during routine clinical follow-up.
Up to 12 months postoperatively

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研究記録日

これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。

主要日程の研究

研究開始 (推定)

2026年9月20日

一次修了 (推定)

2028年12月31日

研究の完了 (推定)

2028年12月31日

試験登録日

最初に提出

2026年9月12日

QC基準を満たした最初の提出物

2026年9月12日

最初の投稿 (実際)

2026年9月16日

学習記録の更新

投稿された最後の更新 (実際)

2026年9月16日

QC基準を満たした最後の更新が送信されました

2026年9月12日

最終確認日

2026年9月1日

詳しくは

本研究に関する用語

その他の研究ID番号

  • PekingUTH ZF SUS Screw

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