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Distal Femoral Osteotomy Is Internal Fixation Better Than External?

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Distal Femoral Osteotomy Is Internal Fixation Better Than External? Clin Orthop Relat Res DOI 10.1007/s11999-010-1755-0 CLINICAL RESEARCH Distal Femoral Osteotomy Is Internal Fixation Better than External? K. T. Matthew Seah BMedSci, MBChB, Raheel Shafi MD, Austin T. Fragomen MD, S. Robert Rozbruch MD Received: 24 June 2010 / Accepted: 20 December 2010 Ó The Association of Bone and Joint Surgeons1 2011 Abstract 34 minutes) than when using a unilateral frame (94 ± Background Distal femoral osteotomies (DFO) can be 65 minutes). Preoperative and postoperative knee ROMs used to correct deformities around the knee. Although were similar for both techniques and there were no major osteotomies can be fixed with either internal or external complications. fixation techniques, the advantages of one over the other Conclusions We obtained accurate correction of defor- are unclear. mities with both fixation techniques. Our experience Questions/purposes We asked whether (1) for both suggests the method to be used should be left to the dis- techniques, we could accurately correct the deformities cretion of the surgeon and the needs and wishes of the based on our preoperative goals for mechanical axis devi- patient after adequate explanation of the advantages and ation (MAD) and lateral distal femoral angle (LDFA), and disadvantages. (2) intraoperative times, (3) preoperative and postoperative Level of Evidence Level III, therapeutic study. See the knee ROM, and (4) complications differed. Guidelines for Authors for a complete description of levels Patients and Methods We identified 26 patients of evidence. (34 limbs) who underwent femoral osteotomies. We com- pared accuracy of correction (based on correction of the MAD and the LDFA), duration of surgery, preoperative Introduction and postoperative knee ROM, and complications. The minimum followup was 20 months (mean, 29 months; Femoral osteotomies are used for correcting deformity and range, 20–40 months). unloading joints with unicompartmental arthritis. Although Results We achieved the desired MAD within 10 mm of TKA narrowed the indications for this once-common pro- the goal in 18 of 21 limbs with the unilateral frame and cedure, the femoral osteotomy remains a reasonable in 12 of 13 limbs using fixator-assisted plating. Opera- treatment for many patients with limb deformities [7, 25], tive time for fixator-assisted plating was longer (122 ± and is broadly indicated when there is a deformity resulting in malalignment of the hip and lower extremity (nonunion/ malunion of a fractured femur neck and rotational defor- The institution of the authors has received support from EBI/Biomet mities, such a severe femoral anteversion or hip and Smith and Nephew Inc, but not directly for this study. osteoarthritis). Each author certifies that his or her institution approved or waived Angular deformities of the distal femur can be acquired approval for the human protocol for this investigation and that all investigations were conducted in conformity with ethical principles or developmental, and are seen in patients with fracture of research malunion [11, 27], adolescent-onset Blount disease [13, 33], metabolic disorders [14], osteoarthritis [5, 6, 17, 18], K. T. M. Seah, R. Shafi, A. T. Fragomen, S. R. Rozbruch (&) and idiopathic processes [14, 20]. Limb deformities affect Institute for Limb Lengthening and Complex Reconstruction, axial alignment of the lower limbs and are especially Hospital for Special Surgery, 535 East 70th Street, New York, NY 10021, USA important regarding mechanical forces sustained across e-mail: [email protected]; [email protected] articular cartilage during ambulation. Biomechanical 123 Seah et al. Clinical Orthopaedics and Related Research1 studies [8, 19, 39] describe how varus and valgus align- The indications for surgery included distal femoral defor- ment of the knee increase medial and lateral load mity with mild to moderate unicompartmental knee respectively; this theoretically could facilitate the pro- osteoarthritis. For patients with valgus deformity and a gression of osteoarthritis. lateral MAD, the minimum deviation was 8 mm lateral. During the past 9 years, we used two minimally invasive For patients with varus deformity with a medial MAD, the approaches to DFOs. The DFO with a unilateral fixator is minimum deformity accepted was 18 mm medial. entirely percutaneous, and the DFO with fixator-assisted Contraindications included patients with advanced, tri- plating is a minimal incision technique that does not compartmental osteoarthritis, and they were treated with require patients to wear an external fixator. We are inclined total knee replacement. We were more likely to recom- to use external fixation in a patient with a thin thigh, when mend external fixation if the patient’s skin quality was there is a perceived need to adjust position postoperatively, poor, if there was a surgical time constraint (eg, additional or when surgical time is an issue (combined femoral/tibial tibial deformity correction in the same surgery), if there surgery), whereas we are inclined to use a locking plate in was a need for additional limb lengthening or if the patients with large thighs or when there is a particular deformity was very large and acute correction was not desire to avoid external fixation, like an adjacent knee considered to be safe. Taking this into account, we chose replacement or a patient who is immunocompromised. the fixation technique after discussion with each patient However, the decision to use either technique is largely regarding their preference for internal or external fixation. driven by patient choice. The minimum followup was 20 months (mean, 29 months; We asked (1) if we could accurately correct the defor- range, 20–40 months). No patients were lost to followup. mities based on our preoperative goals for the MAD and No patients were recalled specifically for this study; all LDFA with both techniques, and whether (2) the intraop- data were obtained from medical records and radiographs. erative times, (3) preoperative and postoperative knee Preoperative evaluation included measurements of ROM, and (4) complications differed. frontal plane deformity on a 51-inch erect-leg bipedal radiograph. The second author (RS) made all measure- ments on the radiographs; the MAD and joint orientation Patients and Methods angles, including the LDFA, were measured using the methods described by Paley et al. [23, 26]. A previous We retrospectively reviewed 26 patients (34 treated limbs) study showed high interobserver reliability for long film who underwent DFO for deformity correction at our measurements of joint orientation angles, such as the MAD institution between 2000 and 2009. We included all and LDFA [12]. We defined the magnitude of the defor- patients who underwent correction for femoral deformities mity by the MAD. Where neutral alignment was the goal, with either fixator-assisted plating or a unilateral frame and the distal mechanical axis line was drawn through the who had at least 1 year followup, and we recorded their center of the knee. When overcorrection was the goal, the demographics (Table 1). We excluded patients younger distal mechanical axis line was drawn to the desired loca- than 18 years. There were no differences in age, preoper- tion through the knee. Patients who intentionally had ative joint orientation angles, proportion of varus/valgus overcorrection either had unicompartmental arthritis or deformities, or length of followup between the two groups valgus deformity. The center of rotation and angulation of patients. Four patients had staged tibial osteotomies. (CORA) was located at the intersection of the proximal and Table 1. Patient demographics of the two groups Variables Unilateral frame Fixator-assisted plating Age (years) 37 ± 12 36 ± 16 Men 91 Women 7 9 Valgus deformity (patients) 15 12 Varus deformity (patients) 4 1 Rotational deformity (patients) 2 0 Varus = preoperative LDFA greater than or equal to 908 (degrees) 94.6 ± 5.6 95.6 ± 6.8 Preoperative LDFA less than 908 (degrees) 85.4 ± 5.6 84.4 ± 6.8 Followup (months) 30 ± 10 28 ± 6 LDFA = lateral distal femoral angle. 123 Correction of femoral deformities Fig. 1A–C The radiographs show the correction of deformity using a unilateral frame. The patient is a 48-year-old man with a marked windswept deformity. (A) A pre- operative radiograph with a red line shows the MAD in the right limb. (B) This radiograph shows DFO and correction of the defor- mity with the unilateral frame. The yellow lines illustrate a normal LDFA of 90°.(C)A postoperative radiograph after removal of the unilateral frame is shown. The patient had a staged tibial osteotomy. MAD has been corrected to 0. distal mechanical axis lines. We planned the level of the match the deformity. The CORA was localized on the proposed osteotomy, and determined the appropriate patient’s thigh using c-arm fluoroscopy, and the hinge of translation needed at the osteotomy site. the fixator was centered over it. The frame then was fixed The senior authors (SRR, ATF) performed all surgeries using two to three proximal and two to three distal 6-mm using both techniques. The procedure for the unilateral half pins. The proximal pins were placed anteriorly and frame (Fig. 1) was performed with the patient under distal pins were introduced from the medial side, off an combined spinal and epidural anesthesia with sedation. All arch. Pin position was chosen so the lateral aspect of the half pins were inserted perpendicular to the anatomic axis femur was free for plating. The frame was detached and the of each segment of the femur to provide improved frame fit osteotomy was performed using a percutaneous multiple on the thigh. The femur was predrilled bicortically and drill hole and osteotome technique under fluoroscopic 6-mm hydroxyapatite-coated half pins were inserted by guidance, before the frame was reattached (Fig. 2A). Using hand through stab incisions. Using four half pins, the the external fixator, the bone fragments were realigned, unilateral rail frame (EBI/ Biomet, Parsippany, NJ, USA) intraoperatively, to correct the deformity, and alignment was mounted.
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