J Korean Foot Ankle Soc.  2010 Jun;14(1):5-10.

A Comparison of the Contact Area between Three Different Correcting Angles after Proximal Crescentic Osteotomy and Ludloff Osteotomy of the First Metatarsal (Preliminary Report)

• Park YW
• Jang KJ
• Park SH

Abstract

PURPOSE
This study was performed to compare the contact area between three different correcting angles after the proximal crescentic and Ludloff osteotomies of the first metatarsal.
MATERIALS AND METHODS
We used the two sawbone models. Proximal crescentic (PCO) and Ludloff osteotomies (LO) were performed and secured using K-wires under the correcting intermetatarsal angle (IMA) 5degrees, 10degrees, and 15degrees. Then each 6 osteotomized model was scanned five times and measured the contact area using the calculating program. We excluded the highest and lowest values.
RESULTS
The mean area of cutting surface was 189 mm2 in PCO, 863 mm2 in LO. The mean contact area (contact ratio; contact area x100/area of cutting surface) of PCO was 149 mm2 (79%) in 5degrees, 139.5 mm2 (74%) in 10degrees, 107 mm2 (57%) in 15degrees IMA. The mean contact area (contact ratio) of LO was 711 mm2 (82%) in 5degrees, 535.5 mm2 (62%) in 10degrees, 330 mm2 (38%) in 15degrees IMA.
CONCLUSION
A significant decrease in the contact area and contact ratio according to increase in correcting IMA was noticed in LO. We recommend the PCO rather than LO, when the IMA is needed to correct over 15degrees.

Keyword

Hallux valgus; First metatarsal; Proximal crescentic osteotomy; Ludloff osteotomy; Contact area

MeSH Terms

Hallux Valgus
Metatarsal Bones
Osteotomy