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Mitchell Osteotomy for Hallux Valgus Using Trans-Osseous

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Mitchell Osteotomy for Hallux Valgus Using Trans-Osseous ISSN: 2643-3885 Faraj. Int J Foot Ankle 2019, 3:026 Volume 3 | Issue 1 Open Access International Journal of Foot and Ankle RESEARCH ARTICLE Mitchell Osteotomy for Hallux Valgus Using Trans-Osseous Capsulorrhaphy for Stabilization Adnan A Faraj FRCS (Orth)* Check for Associate Professor, Orthopaedic Department, Azadi Hospital, Kirkuk Medical School, Kirkuk, Airedale updates Foundation Trust, Keighley, UK *Corresponding author: Adnan A Faraj, Associate Professor, Orthopaedic Department, Azadi Hospital, Kirkuk Medical School, Kirkuk, Iraq Surgeon, Airedale Foundation Trust, Keighley, UK, Tel: 004-474-382-29-521 reported in up to 26.9% of patients in reported series Abstract [1]. A second operation decreases patient satisfaction Background: The fixation method of Mitchell’s osteotomy and increases the overall cost of the treatment. after displacement is controversial. In the current study, we evaluated a previously described technique of using Metal insertion remains to have concerns. Most of transosseous capsulorrhaphy. In this series, foot plaster the historical osteotomy were described without slipper was used for six weeks. metal fixation and had good outcome, some popular Material and methods: Twenty-seven feet (21 patients) types of osteotomy are Mitchell, Chevron and other underwent the technique for symptomatic hallux valgus osteotomies. The Mitchell operation for hallux valgus was included in this study. Retrospective and consecutive was first described in the literature in 1945 by Hawkins series. Mitchell’s step cut osteotomy was performed without and associates [2]. Mygind, in 1952, described a similar metal fixation, trans osseous capsulorrhaphy was used for fixation. procedure [3]. Results: At 15 months follow-up, the results were Mitchell subsequently published an article in 1958 satisfactory in 23 feet, fair in three patients and poor in one describing this procedure, and from this point on patient. Mean HVA correction was 17° and IMA correction it became known as the Mitchell bunionectomy. of 5.4° this is considered to be significant. Mitchell’s original description of this procedure Conclusion: The main advantage of the described included an osteotomy of the distal portion of the technique is that it can be used in a less sophisticated first metatarsal, lateral displacement and angulation surgical unit, without the need for internal fixation implants and image intensifier. of the head of the metatarsal, and exostectomy and capsulorrhaphy [3]. Keywords The method of fixation, as described by Mitchell and Hallux valgus, Mitchell’s, Osteotomy, Trans-osseous, Capsulorrhaphy others utilizing suture material, although reported to have adequate results seems to lend itself to potential complications. The most serious complication is dorsal Introduction displacement of the capital fragment after fixation is More than 300 surgical procedures have been in place. This may lead to lesser metatarsalgia, lesser described over the years for the correction of HV metatarsal lesions, and hallux limitus or rigidus. With deformity, often a metallic screw fixation is used to the advances in fixation devices available to the surgeon stabilize osteotomy. Metallic screw fixation is now the over the years since the Mitchell procedure was first most frequently used fixation method for modified described, better and sounder fixation principles are chevron osteotomies. However, elective implant available that will yield better results. The techniques removal due to irritation of metallic screws has been used are cross-Kirshner wire fixation, biodegradable Citation: Faraj AA (2019) Mitchell Osteotomy for Hallux Valgus Using Trans-Osseous Capsulorrhaphy for Stabilization. Int J Foot Ankle 3:026. Accepted: March 18, 2019; Published: March 20, 2019 Copyright: © 2019 Faraj AA. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Faraj. Int J Foot Ankle 2019, 3:026 • Page 1 of 6 • ISSN: 2643-3885 wire fixation, Herbert screw, A-O screws and other techniques [4-9]. The advocates of internal fixation claim that the stability of the Mitchell procedure is compromised when relying on the lateral spicule, soft tissue, and splinting techniques to maintain correction. Internal fixation, however, can be associated with complications; the fixation is not always secure, the technique is difficult, and implant can damage the articular surface or cause pain if the end is prominent and may require another operation to remove. This is why finding alternative reliable techniques to internal fixation to secure the osteotomy, like the technique pursued in the current study, becomes attractive. Figure 1: Graphic demonstration of the technique showing In the current retrospective study, we report the capsular flap and the step cut osteotomy. the clinical and radiological outcome of Mitchell’s osteotomy using trans-osseous capsulorrhaphy for fixation without internal fixation. Technique has been previously described [10]. Material and Methods Twenty-seven feet (21 patients) who underwent modified Mitchell’s osteotomy for symptomatic hallux valgus were included between 2009 and 2014 consecutively. There were 19 female, and 2 male patients. The mean age of 47-years (17-52 years). One patient lost follow up and was excluded from this series. The left foot was operated on in 16 and the right in 11. Staged bilateral procedures were performed in 6 patients (total 27 feet). The indication for surgery Figure 2: Trans-osseous capsulorrhaphy: Kessler Number 1-0 Vicryl is passed through the V = shaped capsular cut was bunion pain, and pressure symptoms affecting the and passed through a drill hole in the proximal part of second toe because of an under or overlying hallux the osteotomy to tighten up after the displacement of the which has failed to respond to shoe modifications and osteotomy. silicon spacers in between the hallux and the 2nd toe. Standing plain X-rays (anteroposterior and lateral) used and a single dose of prophylactic antibiotics (ceph- was performed in each patient, looking for the hallux alosporin) is used. Through a medial midline incision. valgus angle (HVA), intermetatarsal angle (IMA), The dorsal digital nerve is identified and protected. A the length of the first metatarsal and for excluding V-shaped MTPJ capsular flap is created with the base osteoarthritic changes of the metatarsophalangeal joint of the triangle attached to the proximal phalanx. The (MTPJ). tip of the triangle is raised from the first metatarsal. A Kessler type suture of 1-0 Vicryl is passed through the Patients with gout, elderly with what seems on plain X-ray osteopenia suggesting poor bone quality and capsule from the tip of the triangle to use as a stay su- rheumatoid patients were excluded. ture (the needle is not removed). The metatarsophalan- geal joint capsule is pulled away with this stay suture In our series, we also excluded patients with to aid in the exposure of the joint. Step-cut Mitchell’s lateral forefoot pain or dorsolateral big toe osteotomy is carried out as usual (Figure 1). A 2 mm drill metatarsophalangeal joint (MTPJ) pain from the series. is passed through the first metatarsal just proximal to 5 mm or more of first metatarsal Shortening compared the osteotomy in a vertical fashion and on the medi- to the second metatarsal were also excluded from the al side. The needle of the stay suture of the capsule is study. Intermetatarsal angle (IMA) of more than 25° passed through this hole after displacing the osteotomy and metatarsophalangeal angle more than 44° were and the Vicryl suture is securely knotted to stabilise the also excluded. The modification is described below (10) fixation (Figure 2). When the deformity was severe and (Figure 1 and Figure 2). the correction inadequate despite lateral displacement, Technique a lateral release was carried out; this was necessary in 3 patients. No intraoperative X-ray is used, the correction It is our practice to perform the operation under of the deformity was assessed mainly on appearance general anaesthetics (unless the patient is unfit) and and the percentage of displacement (Figure 3). as a day case. A pneumatic above knee tourniquet is Faraj. Int J Foot Ankle 2019, 3:026 • Page 2 of 6 • ISSN: 2643-3885 Figure 3: Pre and post Anter-posterior plain X-ray of the foot six months following Mitchell’s osteotomy. The wound is closed using 3-0 Vicryl. Local long acting first surgery. anaesthetic ankle block or local infiltration is used at the The range of movement of the metatarsophalangeal end of the operation for pain relief. joint of the hallux prior and after surgery was assessed The patient is allowed mobilization and weight using goniometry, in all apart from 3 patients; the range bearing on the foot avoiding the forefoot. Chemical of movement was satisfactory, often after cast removal thromboprophylaxis was used in patients with high all these patients were stiff at the MTPJ, but within a risk in the form of subcutaneous Fragmin for 4 weeks. mean period of 3 weeks after cast removal (2-17 weeks) A slipper light cast was applied (involving the hallux the range of movement improved. The results were and the heel). The cast was removed 6 weeks after considered satisfactory, when the pain was better, the surgery, or when necessary (tight or concerned about shape of the toe was considered to be good by the pa- the wound). Radiographs of the foot (anteroposterior tient and the range of movement of the big toe MTPJ and lateral is performed to check for correction of the was as good as 80% of the range of movement prior to deformity, and healing of the osteotomy. surgery. Satisfactory radiological outcome was when the Check AP and lateral X-rays is repeated if there are HVA correction was good (more than 15 degrees), the concerns about healing or the osteotomy or when any osteotomy was healing with no significant shortening of complication arise at 3-, 6- and 12-months following the first metatarsal (6 mm shortening was the cut-off) surgery was performed.
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