Genbin Wu1,2, Shunan Gu3, Guangrong Yu4, Feng Yin1. 1. Department of Joint Surgery, Shanghai East Hospital, Tongji University, School of Medicine, Shanghai 200120, China. 2. Orthopaedic Hospital Research Center, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA. 3. Southern Medical University, Guangzhou 510000, China. 4. Department of Orthopedics, Tongji Hospital, Tongji University, School of Medicine, Shanghai 200120, China.
Abstract
BACKGROUND: This study aimed to compare the biomechanical outcomes of the isolated 4th or 5th tarsometatarsal (TMT) joint arthrodesis with the whole lateral TMT joints arthrodesis. METHODS: Ten cadaveric lower legs underwent isolated 4th TMT joint arthrodesis, 5th TMT joint arthrodesis, and whole lateral TMT joints arthrodesis in sequence. Texson F-scan and K-scanTM joint sensor were used to test the medial and lateral plantar pressure and the pressure of calcaneocuboid joint. RESULTS: Compared with the intact foot, the lateral forefoot pressure increased significantly (P<0.05) after 4th TMT joint fusion. The medial forefoot pressure was significantly lower in the 5th TMT joint fusion than that in the intact foot (P<0.05) and the 4th TMT joint fusion (P<0.05), but higher than that in the whole lateral TMT joints fusion (P<0.05). On the contrary, the lateral forefoot pressure was significantly higher in the 5th TMT joint fusion than that in the intact foot and the 4th TMT joint fusion, but lower than that in the whole lateral TMT joints fusion (P<0.05). The medial forefoot pressure was the lowest (P<0.05) and lateral forefoot pressure was the highest (P<0.05) in the whole lateral TMT joints fusion. The calcaneocuboid joint pressure increased respectively with the intact foot being the lowest, followed by the isolated 4th TMT joint arthrodesis, the isolated 5th TMT joint arthrodesis, and the whole lateral TMT joints arthrodesis (P<0.05). CONCLUSIONS: The isolated 4th or 5th TMT joint arthrodesis has less impact on the pressure of forefoot and adjacent joints than the whole lateral TMT joints arthrodesis. The isolated 4th TMT joint arthrodesis has the lowest influence on the pressure of forefoot and adjacent joints. 2019 Annals of Translational Medicine. All rights reserved.
BACKGROUND: This study aimed to compare the biomechanical outcomes of the isolated 4th or 5th tarsometatarsal (TMT) joint arthrodesis with the whole lateral TMT joints arthrodesis. METHODS: Ten cadaveric lower legs underwent isolated 4th TMT joint arthrodesis, 5th TMT joint arthrodesis, and whole lateral TMT joints arthrodesis in sequence. Texson F-scan and K-scanTM joint sensor were used to test the medial and lateral plantar pressure and the pressure of calcaneocuboid joint. RESULTS: Compared with the intact foot, the lateral forefoot pressure increased significantly (P<0.05) after 4th TMT joint fusion. The medial forefoot pressure was significantly lower in the 5th TMT joint fusion than that in the intact foot (P<0.05) and the 4th TMT joint fusion (P<0.05), but higher than that in the whole lateral TMT joints fusion (P<0.05). On the contrary, the lateral forefoot pressure was significantly higher in the 5th TMT joint fusion than that in the intact foot and the 4th TMT joint fusion, but lower than that in the whole lateral TMT joints fusion (P<0.05). The medial forefoot pressure was the lowest (P<0.05) and lateral forefoot pressure was the highest (P<0.05) in the whole lateral TMT joints fusion. The calcaneocuboid joint pressure increased respectively with the intact foot being the lowest, followed by the isolated 4th TMT joint arthrodesis, the isolated 5th TMT joint arthrodesis, and the whole lateral TMT joints arthrodesis (P<0.05). CONCLUSIONS: The isolated 4th or 5th TMT joint arthrodesis has less impact on the pressure of forefoot and adjacent joints than the whole lateral TMT joints arthrodesis. The isolated 4th TMT joint arthrodesis has the lowest influence on the pressure of forefoot and adjacent joints. 2019 Annals of Translational Medicine. All rights reserved.
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