Evaluating the results of long tubular bone distraction with an advanced rod monolateral external fixator for achondroplasia

The work aimed to evaluate the effectiveness of the developed distraction system based on the rod external monolateral fixation mechanisms by comparing it with the classical technique of long tubular bones distraction based on the circular multi-axial system. The study included patients with a genetically confirmed diagnosis of achondroplasia. The experimental group consisted of 14 patients who underwent surgical limb lengthening by the rod monolateral external fixator with a distraction system developed by the authors. The lengthening was performed on 28 segments of tubular bones. The majority of the experimental group patients achieved the lengthening value close to the planned one and the deformation correction. The fixation period was averagely 83.8 ± 3.7 days, the regenerate length was 8.5 ± 0.6 cm, and the mechanical strength of the distraction regenerate was 10.3° ± 2.18°. The rod external fixator with a control distraction system developed by the authors has small dimensions and low weight of the external supporting elements of high durability. It is reported to provide a good psychological tolerance of the treatment process and significantly outperforms the circular multi-axis system. Considering the aforementioned, the proposed apparatus can grant good orthopedic care to patients with achondroplasia.

Bony callus stiffness indirectly evaluated by the axial load-share ratio in vivo as a guide to removing a monolateral external fixator safely

Purpose As the monolateral external fixator is increasingly used in trauma-control and definitive management for high-energy long bone fractures, timing the fixator removal remains a challenge for surgeons. The purpose of this study was to determine the feasibility and effectiveness of the bony callus stiffness indirectly evaluated by the axial load-share ratio in vivo as a guide to removing a monolateral external fixator safely. Methods A total of 131 patients with tibial shaft fractures treated by the monolateral external fixator in our institution were collected from January 2013 to July 2019. In group I, the fixators were removed based on the clinical and radiological assessment only by the treating surgeon. As for group II, the axial load-share (LS) ratio test was accomplished by another medical team without the knowledge of the clinical results. The external fixator was removed when the mechanical test outcome (LS ratio < 10%) was consistent with the conclusion drawn from the clinical and radiological assessment (bone union achieved) by the treating surgeon. Results There was no statistical significance in demographic data between the two groups (P > 0.05). In group I, four patients suffered refracture (the refracture rate was 7.7%) after fixator removal and were successfully treated by an intramedullary nail. In group II, 71 patients underwent fixator removal after the first mechanical test, and another eight patients terminated the external fixation after the second test. None of the 79 patients in group II suffered refracture (the refracture rate was 0%). There was statistical significance in the refracture rate between the two groups (P < 0.05). Conclusion The bony callus stiffness indirectly evaluated by the axial load-share ratio in vivo using the additional circular frame components is an effectively quantitative indicator to complement the clinical assessment of fracture healing in a monolateral external fixation treatment. Removal of the monolateral external fixator is safe when the axial load-share ratio dropped below 10%.

Clinical Outcomes in the Definitive Treatment of High-energy Tibial Diaphyseal Fractures using Hexapod External Fixator Versus Monolateral External Fixator

Background: External fixation, which can preserve the biomechanical microenvironment of fracture healing, playing an important role in managing the high-energy fractures with poor surrounding soft tissues. The purpose of this study was to determine the differences of clinical outcomes, if any, between hexapod external fixator and monolateral external fixator in the definitive treatment of high-energy tibial diaphyseal fractures.Methods: A total of 53 patients with high-energy tibial diaphyseal fractures and definitively treated by the hexapod external fixator (HEF) or monolateral external fixator (MEF) were retrospectively collected and analyzed, from March 2015 to June 2019. There were 31 patients in the HEF treatment, and the other 22 patients were managed by the MEF. The demographic data, surgical duration, external fixation time, final radiological results, complications, and clinical outcomes were documented and analyzed. Difficulties that occur during the treatment were classified according to Paley. The clinical outcomes were evaluated by the Association for the Study and Application of the Method of Ilizarov criteria (ASAMI) at the last clinical visit.Results: The mean surgical duration in the HEF group (62.4±8.3 minutes) was shorter than that in the MEF group (91.4±6.9 minutes) (P<0.05). All patients acquired complete bone union finally. Patients in the HEF group (24.2±3.1 weeks) underwent a shorter average external fixation time than that in the MEF group (26.3±3.8 weeks) (P<0.05). Satisfactory alignment was achieved in all patients without the need for remanipulation. The residual sagittal plane deformities in the HEF group were all less than that in the MEF group (P<0.05). The complication rate was 35.5% in the HEF group, while 45.5% in the MEF group. There was no statistically significant difference between the two groups in ASAMI scores (P>0.05).Conclusion: There is no statistically significant difference in finally clinical outcomes between hexapod external fixator and monolateral external fixator in the definitive treatment of high-energy tibial diaphyseal fractures. The hexapod external fixation treatment is a superior effective method, including advantages of stable fixation, less surgical duration, postoperatively satisfactory fracture reduction, and fewer complications.

Acute correction of proximal tibial coronal plane deformity in small children using a small monolateral external fixator with or without cross-pinning

PurposeSurgical correction of proximal tibia deformity in small children can be challenging. We present the surgical technique and outcome of proximal tibia osteotomy fixed with small monolateral external fixator in this patient group.MethodsA total of 17 cases in eight patients younger than nine years of age were study subjects. A proximal tibia osteotomy was fixed with a small monolateral external fixator with or without cross-pinning. Outcome was evaluated by changes of radiographic parameters such as medial proximal tibia angle (MPTA), metaphyseal diaphyseal angle (MDA) and clinical findings of complications, time interval until weight bearing and fixator removal time.ResultsMPTA improved from a preoperative mean of 73° (sd 4°; 66° to 78°) to an immediate postoperative mean of 90° (sd 3°; 85° to 96°) in varus tibiae, and from 104° (sd 1°; 103° to 105°) to 89° (sd 1°; 88° to 89°) in valgus tibiae. In all, 15 of the 17 cases (88.3 %) achieved postoperative MPTA within the normal range (85° to 90°). MDA improved from a preoperative mean of 19° (sd 5°; 11° to 24°) to an immediate postoperative mean of 0° (sd 4°; -6° to 7°) in varus tibiae, and from -25° (sd 2°; -22° to -24°) to 2° (SD 1°; 1° to 3°) in valgus tibiae. Full weight bearing was possible at mean 1.7 months (0.5 to 3.0). Mean follow-up period was 6.5 years (sd 5.4; 1.0 to 16.0). No complications developed during the follow-up.ConclusionProximal tibia osteotomy fixed with small monolateral external fixator provides accurate, safe and efficient correction in the management of coronal plane angular deformity in small children.Level of EvidenceLevel IV

Minimally invasive methods of combined skeletal fixation using Kirshner’s pins in comminuted femoral and humeral fracture treatment in cats

The article describes clinical cases of surgical treatment of comminuted diaphyseal fractures of three humerus and four femur bones in cats. Three animals (two tomcats, one cat) have the open complex comminuted, not reconstructed fractures of the humerus ― 12-C3, according to AO classification. Two animals (cat and tomcat) were diagnosed with comminuted, non ― reconstructed femoral fractures-32-C3, according to AO classification. One animal (cat) was diagnosed with wedge-shaped fractures of both femur bones-32-v3, according to AO classification. The diagnosis was made on the basis of clinical examination and radiography of bones in the lateral and direct projection. From the moment of injury to the examination and the treatment from 3 to 5 days passed in all patients, the age of patients ranged from 6 months to 4 years. For the treatment of patients, a minimally invasive combined method of osteosynthesis with a monolateral external fixator in combination with an intramedullary spoke (Tie-in method) and a hybrid of I...II type of external fixators in combination with intramedullary fixation were used. Minimally invasive osteosynthesis with Kirschner spokes provided adequate fixation of fractures with maximum preservation of biological factors of bone healing. Consolidation of fractures occurred with the formation of corn, limb function restored in a short time in the absence of contractures of adjacent joints.

Extremidad superior gravemente lesionada. Reporte de un caso clínico. [Mangled upper extremity. Case report]

Se presenta un paciente con una extremidad superior gravemente lesionada por arma de fuego. Inicialmente fue tratado con múltiples limpiezas quirúrgicas y colocación de tutor externo AO. El tratamiento definitivo consistió en tutor externo monolateral, además de injerto estructural de cresta ilíaca. Durante el manejo inicial, se detecta lesión del nervio radial, con nervio en continuidad. Dado el proceso cicatricial y la infección de partes blandas, no se logra manejar en la etapa aguda. Posteriormente se realizan transferencias tendinosas para nervio radial. La evolución fue favorable y la función de la extremidad superior resultó satisfactoria. Se comunica este caso debido a su complejo manejo a causa de las lesiones óseas, neurovasculares, cutáneas y de partes blandas. AbstractWe present a patient with a severely injured upper extremity due to a shotgun. Patient was initially managed with multiple surgical debridements and an AO external fixator.Final treatment was performed with a monolateral external fixator, in addition to an iliac crest structural bone graft. During initial management, a radial nerve injury was observed;the nerve was intact, though devitalized. Given the scarring process and soft tissue infection, treatment was performed in the acute phase. Subsequently, tendon transfers were made to treat a radial nerve injury. Patient evolved favorably and regained adequate function of the upper extremity.This case is presented due to its complex management due to bone, neurovascular, skin, and soft tissue involvement.

Management of Osteomyelitis-Induced Massive Tibial Bone Defect by Monolateral External Fixator Combined with Antibiotics-Impregnated Calcium Sulphate: A Retrospective Study

Aim. The present study is aimed at evaluating the effect of combined treatment on massive bone defect using radical debridement, antibiotic calcium sulphate, and monolateral external fixator. Methods. 35 patients with tibial osteomyelitis received radical debridement, and during surgery antibiotics-impregnated calcium sulphate was used for filling the bone defect. Monolateral external fixator was used to manage the bone defect of average 95 (61-185) cm. Results. Bone union was achieved in 34 patients (97.1%) with no reinfection. One case was presented with reinfection and further debridement was conducted. The average time for the utility of external fixation was 17 (7-32) months, and external fixation index (EFI) was 1.79 mon/cm. The mean follow-up duration after surgery was 33.7 (21-41) months. 19, 13, and 3 patients got excellent, good, and fair bone results, respectively. Meanwhile, functional results were excellent, good, fair, and poor in 13, 15, 6, and 1 patient. The most common complication was pain (100%) and superficial pin-tract infection (22.8%). Delayed maturation was incurred in 2 patients. Conclusion. Our study reveals that radical debridement combined with antibiotics-impregnated calcium sulphate can suppress infection, and distraction osteogenesis using monolateral external fixators plays an effective role in managing osteomyelitis-induced massive tibial bone defect.