Effect of mini-fragment fixation on the stabilization of medial malleolus fractures

Derek F. Amanatullah, Erik McDonald, Adam Shellito, Shain Lafazan, Alejandro Cortes, Shane Curtiss, Philip R Wolinsky

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

BACKGROUND: Oblique fractures of the medial malleolus can arise from the application of axial force at various anatomic positions of the ankle, including supination-external rotation, pronation-external rotation, or pronation abduction. Although a variety of techniques exist to provide fixation of horizontal medial malleolus fractures, the optimal technique and pattern for internal fixation remains unclear. The aim of this study was to evaluate the mechanical properties of four different fixation methods for fractures of the medial malleolus. METHODS: Identical oblique osteotomies were created in synthetic distal tibiae using a jig. The specimens were divided into four fixation groups: contoured 2.0 mm mini-fragment T-plate, figure-of-eight tension band wire, construct two parallel 4.0 mm cancellous screws, and two divergent 4.0 mm cancellous screws. The specimens were tested using offset axial tension at 10 mm/min until 2 mm of joint line displacement. RESULTS: The average stiffness in tension and force at 2 mm of joint line displacement of the plate construct was significantly greater than any of the other constructs (p < 0.05), whereas the average stiffness in tension of the other three groups were not significantly different from each other (p > 0.05). CONCLUSION: Using a contoured 2.0 mm mini-fragment T-plate as the method of fixation resulted in an at least 25% stiffer construct during tension and required at least 24% more force for 2 mm of joint line displacement when compared with more traditional methods of fixation in an osteotomy model of an oblique medial malleolus fracture.

Original languageEnglish (US)
Pages (from-to)948-953
Number of pages6
JournalJournal of Trauma and Acute Care Surgery
Volume72
Issue number4
DOIs
StatePublished - Apr 2012

Fingerprint

Ankle Fractures
Pronation
Joints
Osteotomy
Supination
Tibia
Ankle

Keywords

  • Fixation
  • Horizontal
  • Medial malleolus
  • Oblique
  • Plate

ASJC Scopus subject areas

  • Critical Care and Intensive Care Medicine
  • Surgery
  • Medicine(all)

Cite this

Effect of mini-fragment fixation on the stabilization of medial malleolus fractures. / Amanatullah, Derek F.; McDonald, Erik; Shellito, Adam; Lafazan, Shain; Cortes, Alejandro; Curtiss, Shane; Wolinsky, Philip R.

In: Journal of Trauma and Acute Care Surgery, Vol. 72, No. 4, 04.2012, p. 948-953.

Research output: Contribution to journalArticle

Amanatullah, Derek F. ; McDonald, Erik ; Shellito, Adam ; Lafazan, Shain ; Cortes, Alejandro ; Curtiss, Shane ; Wolinsky, Philip R. / Effect of mini-fragment fixation on the stabilization of medial malleolus fractures. In: Journal of Trauma and Acute Care Surgery. 2012 ; Vol. 72, No. 4. pp. 948-953.
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abstract = "BACKGROUND: Oblique fractures of the medial malleolus can arise from the application of axial force at various anatomic positions of the ankle, including supination-external rotation, pronation-external rotation, or pronation abduction. Although a variety of techniques exist to provide fixation of horizontal medial malleolus fractures, the optimal technique and pattern for internal fixation remains unclear. The aim of this study was to evaluate the mechanical properties of four different fixation methods for fractures of the medial malleolus. METHODS: Identical oblique osteotomies were created in synthetic distal tibiae using a jig. The specimens were divided into four fixation groups: contoured 2.0 mm mini-fragment T-plate, figure-of-eight tension band wire, construct two parallel 4.0 mm cancellous screws, and two divergent 4.0 mm cancellous screws. The specimens were tested using offset axial tension at 10 mm/min until 2 mm of joint line displacement. RESULTS: The average stiffness in tension and force at 2 mm of joint line displacement of the plate construct was significantly greater than any of the other constructs (p < 0.05), whereas the average stiffness in tension of the other three groups were not significantly different from each other (p > 0.05). CONCLUSION: Using a contoured 2.0 mm mini-fragment T-plate as the method of fixation resulted in an at least 25{\%} stiffer construct during tension and required at least 24{\%} more force for 2 mm of joint line displacement when compared with more traditional methods of fixation in an osteotomy model of an oblique medial malleolus fracture.",
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AU - Curtiss, Shane

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N2 - BACKGROUND: Oblique fractures of the medial malleolus can arise from the application of axial force at various anatomic positions of the ankle, including supination-external rotation, pronation-external rotation, or pronation abduction. Although a variety of techniques exist to provide fixation of horizontal medial malleolus fractures, the optimal technique and pattern for internal fixation remains unclear. The aim of this study was to evaluate the mechanical properties of four different fixation methods for fractures of the medial malleolus. METHODS: Identical oblique osteotomies were created in synthetic distal tibiae using a jig. The specimens were divided into four fixation groups: contoured 2.0 mm mini-fragment T-plate, figure-of-eight tension band wire, construct two parallel 4.0 mm cancellous screws, and two divergent 4.0 mm cancellous screws. The specimens were tested using offset axial tension at 10 mm/min until 2 mm of joint line displacement. RESULTS: The average stiffness in tension and force at 2 mm of joint line displacement of the plate construct was significantly greater than any of the other constructs (p < 0.05), whereas the average stiffness in tension of the other three groups were not significantly different from each other (p > 0.05). CONCLUSION: Using a contoured 2.0 mm mini-fragment T-plate as the method of fixation resulted in an at least 25% stiffer construct during tension and required at least 24% more force for 2 mm of joint line displacement when compared with more traditional methods of fixation in an osteotomy model of an oblique medial malleolus fracture.

AB - BACKGROUND: Oblique fractures of the medial malleolus can arise from the application of axial force at various anatomic positions of the ankle, including supination-external rotation, pronation-external rotation, or pronation abduction. Although a variety of techniques exist to provide fixation of horizontal medial malleolus fractures, the optimal technique and pattern for internal fixation remains unclear. The aim of this study was to evaluate the mechanical properties of four different fixation methods for fractures of the medial malleolus. METHODS: Identical oblique osteotomies were created in synthetic distal tibiae using a jig. The specimens were divided into four fixation groups: contoured 2.0 mm mini-fragment T-plate, figure-of-eight tension band wire, construct two parallel 4.0 mm cancellous screws, and two divergent 4.0 mm cancellous screws. The specimens were tested using offset axial tension at 10 mm/min until 2 mm of joint line displacement. RESULTS: The average stiffness in tension and force at 2 mm of joint line displacement of the plate construct was significantly greater than any of the other constructs (p < 0.05), whereas the average stiffness in tension of the other three groups were not significantly different from each other (p > 0.05). CONCLUSION: Using a contoured 2.0 mm mini-fragment T-plate as the method of fixation resulted in an at least 25% stiffer construct during tension and required at least 24% more force for 2 mm of joint line displacement when compared with more traditional methods of fixation in an osteotomy model of an oblique medial malleolus fracture.

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