Relationship of tibial torsion and knee angles to hallux valgus

NewsBot · Jan 6, 2019

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Tibial Torsion and Knee Varus Angle: Are These Aetiologies of Hallux Valgus?
Young Hwan Kim
Soonchunhyang Medical Science 2018;24(2): 170-174.

Objective:
The purpose of this study is to evaluate that knee deformity (varus or valgus) due to osteoarthritis of the knee and tibial torsion could be aetiologies of hallux valgus.
Method:
Forty-nine patients (43 females, six males; mean patient age, 69.88 ± 6.12 years) before total knee arthroplasty for advanced primary osteoarthritis were recruited. All deformities were of the left knee. Preoperative torsional computed tomography, anteroposterior (AP) and lateral weight-bearing foot radiographs, AP and lateral weight-bearing knee radiographs, and long-leg standing AP views were obtained for each patient. The correlations between foot angle and knee varus angle or tibial torsion angle were examined.
Results:
There was no significant correlation between knee varus angle and foot angle. Similarly, there was no significant relationship between tibial torsional angle and foot angle, except talocalcaneal angle (TCA)-lateral (r=0.28). No significant relationships were found between TCA-AP and (1–2 intermetatarsal angle [IMA] and hallux valgus angle [HVA]), or between TCA-lateral and (1–2 IMA and HVA).
Conclusion:
No significant correlations were found between the knee anatomical axis (knee varus angle) and foot angle or between the tibial torsional angle and foot angle. Tibial torsion and knee varus angle were not aetiologies for hallux valgus.
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NewsBot · Apr 25, 2021

Tibial torsion correlates with talar morphology
David J.Ciufo et al
Foot and Ankle Surgery; 18 April 2021

Highlights
•There is a correlation between tibial torsion and talus morphology.
•External tibial torsion correlates with a cavovarus foot type.
•The talus can have a wide variation in neck-body anatomy.
•Axial anatomy of the ankle is important for preoperative planning.
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Background
There is limited literature on axial rotation of the ankle or variations in anatomy of the talus. We aim to evaluate the rotational profile of the distal tibia and its relationship to talus morphology, radiographic foot-type, and tibiotalar tilt in arthritic ankles.

Methods
Preoperative imaging was reviewed in 173 consecutive patients with ankle arthritis. CT measurements were used to calculate tibial torsion and the talar neck-body angle (TNBA). Tibiotalar tilt and foot-type were measured on weightbearing plain radiographs.

Results
Measurements indicated mean external tibial torsion of 29.2 ± 9.1˚ and TNBA of 35.2 ± 7.5˚ medial. Tibiotalar tilt ranged from 48˚ varus to 23.5˚ valgus. A moderate association between increasing external tibial torsion and decreasing TNBA was found (ρ = −0.576, p < .0001). Weak relationships were found between external tibial torsion and varus tibiotalar tilt (ρ = −0.239, p = .014) and plantarflexion of the talo-first metatarsal angle (ρ = −0.218, p < .025).

Conclusion
We observed a statistically significant correlation between tibial torsion and morphology of the talus, tibiotalar tilt, and first ray plantarflexion. This previously unreported association may provide information regarding the development of foot and ankle deformity and pathology.
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