The deformity of the tarsometatarsal joint and the first metatarsal in the coronal plane in hallux valgus
Refereed conference paper presented and published in conference proceedings
CUHK Authors
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AbstractHallux valgus (HV) is one of the most common diseases of the forefoot. Recently, the deformities in the coronal plane have attracted attention especially with the recent claims of torsional changes within the 1st metatarsal (MT) instead of the sole rotation at the tarsometatarsal joint (TMTJ). However, utilising X-ray to measure coronal deformity has limited accuracy. We hope to establish a reliable method using CT and 3D analysis software to differentiate how much of the overall pronation is related to TMTJ rotation and bony torsion, respectively. The scans were performed using Xtreme CT II and the data were imported into Mimics and 3-Matic for further analysis. The landmarks were determined on the medium cuneiform and 1st MT. Lines were connected accordingly and angles between them presented the rotation at TMTJ and torsion within 1st MT, respectively. Eight patients and six normal subjects were recruited. The TMTJ rotation in HV and normal were 15.36 ± 3.94° and 7.07 ± 1.74°, respectively (p=0.002). No significant difference was found in the 1st MT torsion between the two groups. It seems that the joint rotation at TMTJ could contribute more to the coronal deformity in HV. Thus, the Lapidus TMT joint arthrodesis or soft tissue reconstruction may be a better option than 1st MT osteotomies. However, a larger subject pool is required to provide more powerful results to our conclusion, which may help us know the actual localisation of the coronal deformity and eventually improve the guidelines for HV treatment.
Acceptance Date31/10/2020
All Author(s) ListRachel Xiaoyu Wei, Samuel Ka-Kin Ling, Chun Sing Chui, Sai Chuen Fu, Vivian Wing-Yin Hung, Patrick Shu-Hang Yung
Name of ConferenceThe Hong Kong Orthopaedic Association the 40th Annual Congress 2020
Start Date of Conference31/10/2020
End Date of Conference01/11/2020
Place of ConferenceHong Kong
Country/Region of ConferenceHong Kong
Proceedings TitleThe Hong Kong Orthopaedic Association the 40th Annual Congress 2020
Year2020
Month10
Day31
PublisherHong Kong Academy of Medicine Press
Pages59 - 59
LanguagesEnglish-United Kingdom
