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The influence of talonavicular versus double arthrodesis on load dependent motion of the midtarsal joint.

Abstract：

BACKGROUND:Today the most frequently used operative procedures in advanced arthritis of the hindfoot joints are isolated talonavicular arthrodesis and double arthrodesis (involving the talonavicular and calcaneocuboid joints, i.e. the Chopart joint). This in vitro study investigates whether the fusion of the talonavicular joint alone can provide the hindfoot, as well as a midfoot, with comparable biomechanical stability as the double arthrodesis does. Hence with the less-invasive intervention the same benefit in terms of pain reduction and better functionality could be achieved. METHODS:In a series of ten fresh cadaver feet without any radiological pathologies, we measured the range of motion of different tarsal bones in three planes under axial stress. Every foot was loaded without arthrodesis, after talonavicular and after double arthrodesis, by charging tibia and fibula with a force of 350 N using a calibrated Instron® load frame. Each tarsal bone was marked with a K-wire and its motion was measured by registering the movement of the wire’s shade that was projected onto the surrounding walls of the trial box. RESULTS:Both operative procedures led to a considerable reduction of the motion of every marked bone to a mean of 18% of the preoperative value. In direct comparison of the two simulated arthrodeses we found for every bone and in every plane only minimal differences of the mean excursions of 1.0 mm on average. Both fusions lead to equal residual tarsal bone motion postoperatively, and provide the midtarsal joint as well as the subtalar joint with comparable biomechanical stability. CONCLUSIONS:Isolated talonavicular arthrodesis is a useful and effective alternative to double arthrodesis. It is the less complicated, less-invasive and functionally equivalent operative option for arthritic alterations of the hindfoot and transverse tarsal joint.

journal_name

Arch Orthop Trauma Surg

journal_title

Archives of orthopaedic and trauma surgery

authors

Thelen S,Rütt J,Wild M,Lögters T,Windolf J,Koebke J

doi

10.1007/s00402-009-0878-9

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

47-53

issue

eissn

0936-8051

issn

1434-3916

journal_volume

130

pub_type

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The influence of talonavicular versus double arthrodesis on load dependent motion of the midtarsal joint.