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Proximal first metatarsal opening wedge osteotomy: geometric analysis on saw bone models
R Kugan1, V A Currall1, P Johal1
1Heatherwood and Wexham Park Hospitals, NHS Foundation Trust, Heatherwood Hospital, London Road, Ascot, SL5 8AA, UK.
Foot (Edinburgh, Scotland)
|December 3, 2014
Summary
This study evaluated proximal opening wedge osteotomy for hallux valgus. Larger wedge sizes improved correction, with specific orientations offering advantages in length increase and angle correction.
Area of Science:
- Orthopedic surgery
- Foot and ankle biomechanics
Background:
- Hallux valgus correction utilizes various osteotomies based on deformity severity.
- Locking plates have increased interest in opening wedge basal osteotomies.
Purpose of the Study:
- To investigate the biomechanical properties and limitations of proximal opening wedge osteotomy.
- To analyze the geometric outcomes of different osteotomy orientations and wedge sizes.
Main Methods:
- Proximal opening wedge osteotomies were performed on saw bone models.
- Four orientations (PG, PS, DEC, OB) and three wedge sizes were tested.
- Measurements included axial/plantar translation and inter-metatarsal angle.
Main Results:
- Increased wedge size correlated with greater plantar translation and inter-metatarsal angle correction.
- The DEC osteotomy maximized metatarsal shaft length increase.
- The PS osteotomy yielded the greatest inter-metatarsal angle correction.
Conclusions:
- This study provides the first comprehensive geometric evaluation of proximal opening wedge osteotomy.
- Findings offer insights into optimizing this technique for hallux valgus correction.
