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Scientific Articles   |    
Indications for Supramalleolar Osteotomy in Patients with Ankle Osteoarthritis and Varus Deformity
Woo-Chun Lee, MD1; Jeong-Seok Moon, MD1; Kang Lee, MD1; Woo Jin Byun, MD1; Sang Hyeong Lee, MD1
1 Department of Orthopaedic Surgery, Seoul Paik Hospital, College of Medicine, Inje University, Number 85, 2-ga, Jeo-dong, Jung-Gu, Seoul, 100-032, South Korea. E-mail address for W.-C. Lee: lwsk980@unitel.co.kr
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Disclosure: None of the authors received payments or services, either directly or indirectly (i.e., via his or her institution), from a third party in support of any aspect of this work. None of the authors, or their institution(s), have had any financial relationship, in the thirty-six months prior to submission of this work, with any entity in the biomedical arena that could be perceived to influence or have the potential to influence what is written in this work. Also, no author has had any other relationships, or has engaged in any other activities, that could be perceived to influence or have the potential to influence what is written in this work. The complete Disclosures of Potential Conflicts of Interest submitted by authors are always provided with the online version of the article.

Investigation performed at the Department of Orthopaedic Surgery, Seoul Paik Hospital, Seoul, South Korea

Copyright © 2011 by The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2011 Jul 06;93(13):1243-1248. doi: 10.2106/JBJS.J.00249
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Abstract

Update 

This article was updated on October 5, 2011, because of a previous error. The legend for Figure 1-C, which had previously not included a credit line, now includes the credit "(Copyright © 2011 by the American Orthopaedic Foot and Ankle Society, Inc., originally published in Foot & Ankle International, 32[7]:694 and reproduced here with permission.)"

Background: 

Osteotomies are reported to be effective for the treatment of most cases of primary and traumatic moderate osteoarthritis of the ankle joint. Because of unsatisfactory results following supramalleolar tibial osteotomy in several of our patients, we investigated the cause of the unsatisfactory results and the indications for this surgical procedure.

Methods: 

Supramalleolar tibial osteotomy combined with fibular osteotomy was performed in sixteen ankles (sixteen patients) to treat moderate medial ankle osteoarthritis. The median duration of follow-up was 2.3 years (range, one to 6.5 years). Clinical assessment was performed with use of the American Orthopaedic Foot & Ankle Society (AOFAS) scale, and the osteoarthritis stage was determined radiographically with use of the modified Takakura classification system. Clinical and radiographic results were compared among groups defined by high (≥9.5°) or low (≤4°) postoperative talar tilt and by the presence or absence of postoperative lateral subfibular pain. The optimal threshold of preoperative talar tilt for predicting high postoperative talar tilt was determined with use of receiver operating characteristic curve analysis.

Results: 

The mean AOFAS score, mean Takakura stage, and mean values of all radiographic parameters were improved significantly after surgery. The preoperative talar tilt was correlated with the postoperative talar tilt (Spearman rho = 0.75, p < 0.01). The mean AOFAS score was higher (p = 0.02) and the mean radiographic stage was lower (p = 0.03) in the group with low postoperative talar tilt than in the group with high talar tilt. The optimal threshold for predicting high postoperative talar tilt was 7.3° of preoperative talar tilt, with a sensitivity of 100% and a specificity of 91.7%. The patients with lateral subfibular pain had a lower mean AOFAS score, a greater angle between the tibia and the ankle surface postoperatively, and greater postoperative heel valgus than those without lateral subfibular pain.

Conclusions: 

Supramalleolar osteotomy is indicated for the treatment of ankle osteoarthritis in patients with minimal talar tilt and neutral or varus heel alignment.

Level of Evidence: 

Therapeutic Level IV. See Instructions to Authors for a complete description of levels of evidence.

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    References

    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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