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The Medial Femoral Condyle Flap for Reconstruction of Intercondylar Pathological Fractures of the Thumb

Hsu, Chung-Chen, MD; Loh, Charles Yuen Yung, MBBS, MSc, MS; Lin, Yu-Te, MD; Lin, Cheng-Hung, MD

Plastic and Reconstructive Surgery – Global Open: February 2017 - Volume 5 - Issue 2 - p e1242
doi: 10.1097/GOX.0000000000001242
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Taiwan

From the Department of Plastic Surgery, Chang Gung Memorial Hospital, Taoyuan, Taiwan; Department of Medicine, College of Medicine, Chang Gung University, Taiwan.

Disclosure: The authors have no financial interest to declare in relation to the content of this article. The Article Processing Charge was paid for by the authors.

Chung-Chen Hsu, MD, Department of Plastic Surgery, Chang Gung Memorial Hospital, 5, Fu-Hsing Street, Kuei-Shan, Taoyuan 333, Taiwan, E-mail: hsu.chungchen@gmail.com

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

The reconstruction of subcondylar bone defects affecting joint stability and range of motion (ROM) can pose a challenge to the reconstructive surgeon, especially when restoration of fine movements of the hand is required. When rapid bone union is required, free vascularized bone transfer may be preferable over nonvascularized bone grafts.1 We present a case of free vascularized bone transfer using a medial femoral condyle (MFC) flap2 for the reconstruction of a pathological fracture of the interphalangeal joint (IPJ) of a thumb in a high functional demand patient. This article represents the first of its kind in the restoration of IPJ ROM after reconstruction of bone defect.

A 20-year-old male patient with a professional career in judo presented to outpatient clinic with pain on movement of his IPJ of the thumb. Radiography revealed the presence of an intercondylar fracture of the IPJ with an area of radiolucency at the distal head of the proximal phalanx of the thumb (Fig. 1). A suspicion of a pathological fracture was explained to the patient, but he was adamant on attending a judo competition in 2 months’ time. Options of reconstructing the defect were explained to the patient including nonvascularized bone grafts. Given the time frame to recover, an option of free vascularized bone transfer was offered to the patient with preservation of IPJ ROM crucial for his career performance.

Fig. 1.

Fig. 1.

An MFC bone flap was harvested from his left distal femur.3 Excision of the bony lesion and extended curettage were performed, and the articular surface of the IPJ was preserved. A Kirschner wire was passed through the 2 intercondylar fragments. The fracture was further reduced with a tension band wire. The free bone flap was then placed into the defect, and 4/0 polydioxanone suture was used to tack the periosteum down. The bone flap was anastomosed to the digital artery of the thumb and 2 dorsal veins, and a thumb spica splint was used for joint immobilization.

At the 5-week follow-up, radiographic confirmation and clinical examination revealed complete bone union, and active motion was permitted (Fig. 2). At the 2-month follow-up before his competition, the IPJ of his thumb had a ROM of 0 to 60 degrees and the patient had no issue with the donor site, allowing him to run and squat at will. The patient was extremely satisfied with his surgical and functional outcome, which allowed him to successfully complete his competition. Pathology revealed a diagnosis of a giant cell tumor, which has not recurred in the 5 years since his initial operation.

Fig. 2.

Fig. 2.

This article represents the first description of an MFC bone flap in the reconstruction of an intercondylar fracture associated with a subcondylar proximal phalanx head defect. A vascularized bone graft facilitated complete bone union within a short period of time and preserved IPJ ROM, which met the needs of a patient with competitive sporting demands. A small piece of bone harvested resulted in minimal donor-site morbidity as well.4

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REFERENCES

1. Rizzo M, Moran SL. Vascularized bone grafts and their applications in the treatment of carpal pathology. Semin Plast Surg. 2008;22:213–227.
2. Houdek MT, Wagner ER, Wyles CC, et al. New options for vascularized bone reconstruction in the upper extremity. Semin Plast Surg. 2015;29:20–29.
3. Yamamoto H, Jones DB Jr, Moran SL, et al. The arterial anatomy of the medial femoral condyle and its clinical implications. J Hand Surg Eur Vol. 2010;35:569–574.
4. Rao SS, Sexton CC, Higgins JP. Medial femoral condyle flap donor-site morbidity: a radiographic assessment. Plast Reconstr Surg. 2013;131:357e–362e.
Copyright © 2017 The Authors. Published by Wolters Kluwer Health, Inc. on behalf of The American Society of Plastic Surgeons.