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Sesamoid reduction and recurrence of HAV

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Old 1st July 2009, 04:03 PM
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Default Sesamoid reduction and recurrence of HAV

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Postoperative Incomplete Reduction of the Sesamoids as a Risk Factor for Recurrence of Hallux Valgus
Ryuzo Okuda, Mitsuo Kino****a, To****o Yasuda, Tsuyoshi Jotoku, Naoshi Kitano, and Hiroaki Shima
The Journal of Bone and Joint Surgery (American). 2009;91:1637-1645.
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Background: It is unknown whether postoperative incomplete reduction of the sesamoids is a risk factor for the recurrence of hallux valgus. The purpose of the present study was to clarify the relationship between the postoperative relative sesamoid position and the recurrence of hallux valgus.
Methods: Dorsoplantar weight-bearing radiographs of sixty normal feet (the control group) and sixty-five feet with hallux valgus (the hallux valgus group) in a study of adult women were reviewed. The feet in the hallux valgus group were treated with a proximal metatarsal osteotomy, and the radiographs were assessed preoperatively, at the early follow-up interval (at a mean of 3.1 months), and at the most recent follow-up interval (at a mean of forty-five months). The position of the medial sesamoid was classified with a grading system ranging from I through VII as described by Hardy and Clapham. In the feet with hallux valgus, we defined a grade of IV or less as the normal position of the medial sesamoid (the normal-position group) and grade V or greater as lateral displacement of the sesamoid (the displacement group).

Results: Fifty feet (83%) in the control group were classified as grade IV or less and ten, as grade V. All feet in the hallux valgus group were classified as grade V or greater preoperatively, forty-eight feet (74%) were classified as grade IV or less at the early follow-up evaluation, and forty-two feet (65%) were classified as grade IV or less at the most recent follow-up evaluation. The average hallux valgus angle in the hallux valgus group was 38.3° (range, 25° to 60°) preoperatively, 11.9° (range, 4° to 28°) at the time of the early follow-up, and 13.9° (range, 0° to 33°) at the time of the most recent follow-up. There was no significant difference in the average hallux valgus angle between the early and most recent follow-up evaluations in the feet that were considered to be in the normal-position group at the time of the early follow-up (p = 0.084). In the feet that were considered to be in the displacement group at the time of the early follow-up, the average hallux valgus angle at the time of the most recent follow-up was significantly greater than that at the time of the early follow-up (19.5° ± 8.4° compared with 15.0° ± 5.8°) (p = 0.0082). The feet that were in the displacement group at the time of the early follow-up had a greater risk of having recurrence of the hallux valgus at that time than did those in the normal-position group (odds ratio, 10.0; 95% confidence interval, 2.75 to 36.33).

Conclusions: Postoperative incomplete reduction of the sesamoids can be a risk factor for the recurrence of hallux valgus. The identification of incomplete reduction of the sesamoids intraoperatively may allow modification of surgical procedures and improvement of the surgical results.
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Old 8th July 2014, 12:54 AM
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Default Re: Sesamoid reduction and recurrence of HAV

Measuring Sesamoid Position in Hallux Valgus
When Is the Sesamoid Axial View Necessary?

Dominic Catanese, DPM FACFAS; Daniel Popowitz, DPM, AACFAS; Aharon Z. Gladstein, MD
Foot Ankle Spec July 7, 2014
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Measuring tibial sesamoid position is an important component of the preoperative radiographic evaluation of hallux valgus as it helps guide the surgeon in surgical selection. Tibial sesamoid position is typically measured on an anteroposterior (AP) radiograph on a scale from 1 to 7 as described by Hardy and Clapham. Some authors have advocated measuring the position on the sesamoid axial view, noting that the AP and axial views often yield different measurements. There is no consensus as to which view is more helpful in guiding the surgeon’s surgical decision. Weightbearing radiographs of 99 feet in patients with a clinical diagnosis of hallux valgus were retrospectively reviewed. Tibial sesamoid position was measured on the AP view using the 7-point scale of Hardy and Clapham. Tibial sesamoid position was also measured on the axial radiograph. Cohen’s kappa statistic was used to assess agreement of measurements obtained on the 2 views. There was poor agreement of the AP and axial views, with a kappa of 0.31. In our analysis of the data, it was determined that the lack of agreement was due mainly to X-rays showing tibial sesamoid positions of 4 and 5. A subgroup analysis of all X-rays with tibial sesamoids in positions other than 4 or 5 showed excellent agreement, with a kappa of 0.95. Anteroposterior and sesamoid axial views of feet with hallux valgus show excellent agreement in patients with the tibial sesamoid in positions other than 4 or 5. If the tibial sesamoid has a position of 4 or 5 on the AP, an axial view may be warranted to further understand the extent of deformity.
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