Desing and comparison of bone substitutes. Study of in vivo behavior in a rabbit model. / Diseño y comparativa de biomateriales para el tratamiento de defectos óseos. Estudio de su comportamiento in vivo en modelo animal de conejo.

AIM: Compare bone formation capacity in vivo of two types of biomaterials designed as bone substitutes with respect to iliac crest autograft, one based on carbonate hydroxyapatites and the other one on bioactive mesoporous glass. MATERIALS AND METHODS: Experimental study consisting on 14 adult female New Zeland rabbits where a critical defect was made in the rabbit radius bone. The sample was divided into four groups: defect without material, with iliac crest autograft, with carbonatehydroxyapatite support, and with bioactive mesoporous glass support. Serial X-ray studies were carried out at 2, 4, 6 and 12 weeks and a microCT study at euthanasia at 6 and 12 weeks. RESULTS: In the X-ray study, autograft group showed the highest bone formation scores. Both groups of biomaterials presented bone formation similar and greater than the defect without material, but always less than in the autograft group. The results of the microCT study showed the largest bone volume in the study area in the autograft group. The groups with bone substitutes presented greater bone volume than the group without material but always less than in the autograft group. CONCLUSION: Both supports seem to promote bone formation but are not capable of reproducing the characteristics of autograft. Due to their different macroscopic characteristics, each one could be suitable for a different type of defect.

[Translated article] Design and comparison of bone substitutes. Study of in vivo behaviour in a rabbit model.

AIM: To compare the in vivo bone formation capacity of of biomaterials designed as bone substitutes with respect to iliac crest autograft, one based on carbonate hydroxiapatite and the other one on bioactive mesoporous glass. MATERIALS AND METHODS: Experimental study consisting on 14 adult female New Zeland rabbits where a critical defect was made in the rabbit radius bone. The sample was divided into four groups: defect without material, with iliac crest autograft, with carbonatehydroxyapatite scaffold, and with bioactive mesoporous glass scaffold. Serial X-ray studies were carried out at 2, 4, 6 and 12 weeks and a microCT study at euthanasia at 6 and 12 weeks. RESULTS: In the X-ray study, autograft group showed the highest bone formation scores. Both groups of biomaterials presented bone formation similar and greater than the defect without material, but always less than in the autograft group. The results of the microCT study showed the largest bone volume in the study area in the autograft group. The groups with bone substitutes presented greater bone volume than the group without material but always less than the autograft group. CONCLUSION: Both scaffolds seem to promote bone formation but are not capable of reproducing the characteristics of autograft. Due to their different macroscopic characteristics, each one could be suitable for a different type of defect.

Does the fracture of the lateral wall affect the degree of collapse and the degree of sliding of the cephalic plate, in pertrochanteric fractures treated by intramedullary interlocking? Radiological study and review of the literature. / ¿Afecta la fractura de la pared lateral al grado de colapso y al grado de deslizamiento de la lámina cefálica, en fracturas pertrocantéreas tratadas mediante enclavado intramedular? Estudio radiológico y revisión de la literatura.

BACKGROUND: Lateral wall fracture has been recognized as an important sign of instability of pertrochanteric fractures. The aim of the present study is to assess the relationship between lateral wall fractures, helical blade telescoping and neck shortening in fractures treated with intramedullary nailing. MATERIAL AND METHOD: A descriptive radiological study was performed at our institution. Patients who suffered a pertrochanteric fracture, treated at Hospital 12 de Octubre by intramedullary nailing were included. All fractures were classified according to Evans and AO systems. Preoperative and postoperative radiological assessment was carried out including a lateral wall fracture classification, helical blade telescoping and femoral neck shortening. RESULTS: 210 patients were included, 48% had a fracture of the femoral lateral wall. Helical blade telescoping was higher in lower lateral wall fractures with respect to higher fractures. Difference was statistically significant (p<0.05). Neck shortening was higher in fractures with femoral lateral wall disruption; despite not have found any significant differences comparing to fractures with intact lateral wall (P=.39). Multivariate analysis showed statistically significant association between helical blade telescoping, neck shortening and lateral wall fracture. CONCLUSIONS: There is evidence of a higher helical blade telescoping and neck shortening in pertrochanteric fractures with lateral wall fracture treated with intramedullary nails, especially in those with most unstable patterns such us fractures of the lateral wall distal to the vastus ridge.

Trans-olecranon fracture dislocations: How should we treat them?

BACKGROUND: Trans-olecranon fracture dislocations are the least frequent complex elbow instability. Proper surgical treatment should be performed to avoid postoperative complications. METHODS: A retrospective design study was performed. Patients that suffered from this injury, treated at our center from 2010 to 2016 were included. Fifteen patients were analyzed. Functional results were measured using DASH, MEPS and VAS scores. Average time from injury to first surgical treatment was 4.87 days. Radial head fracture was present in seven cases and coronoid process in three patients. Most frequent complication was hardware disturbances in five patients. Mean follow up was 3.65 years. RESULTS: Mean range of motion (ROM) was evaluated 1 year postoperatively: 129° flexion, 6° flexion contracture, and less than 5° deficit of pronation/supination. Clinical and functional results are encouraging, DASH 36.38, MEPS 100 and VAS 0.46. CONCLUSION: Trans-olecranon fracture dislocations could obtain functional range of movement, pain relief and good functional outcomes with a standardized protocol of surgical fixation. It is important to achieve proper ulnar fixation, focusing in reestablishing dorsal angulation, and also to treat radial head and coronoid injuries properly, if present.

[Mid-term complications of the monopolar, modular radial head prosthesis]. / Complicaciones a mediano plazo de la prótesis monopolar modular de cabeza radial.

INTRODUCTION: The objective of this study is to assess the type, frequency and severity of complications after the implantation of the modular monopolar radial head prosthesis. MATERIAL AND METHODS: Forty-seven patients with 48 radial head prostheses implanted between 2009 and 2017 were reviewed retrospectively. Patients were evaluated clinical and radiographically for a mean follow-up of 43.55 months (range: 12-89). RESULTS: The same type of prosthesis was implanted in every patient (Ascension Modular Radial Head). The average score in the Mayo Elbow Performance Score was 88.29 ± 9.9 points. During the follow-up, three patients (6.25%) suffered from continuous pain. Twelve cases (25.5%) showed radiological oversizing, though only five were symptomatic. Heterotopic ossification was detected in twenty-seven cases (57.4%). Eleven patients (23.4%) developed postoperative stiffness. Nineteen cases (40.42%) showed periprosthetic osteolysis, from which seven were symptomatic. Thirteen patients (27%) developed surgery-related complications: three cases of infection, four cases of symptomatic loosening, two neurapraxies, one instability and three cases of oversizing with associated stiffness. Nine patients (18.75%) required reintervention. DISCUSSION: Our study obtains a 27% of overall complications, mostly related to oversizing and prosthetic loosening, and 19% of reinterventions. These results are similar to those presented in previous studies, with variations depending on the time of follow-up. Further research is also required to evaluate long-term results and the potential progression of the radiographic findings. CONCLUSION: Taken together, these data stress the need for improvement in both the surgical technique and the design of the implants.

INTRODUCCIÓN: El objetivo de este estudio es evaluar el tipo, la frecuencia y la gravedad de las complicaciones después de la implantación de la prótesis monopolar modular de cabeza radial. MATERIAL Y MÉTODOS: Se revisaron retrospectivamente 47 pacientes con 48 prótesis de cabeza radial implantadas entre 2009 y 2017 durante una media de 43.55 meses (rango: 12-89). RESULTADOS: Se implantó el mismo tipo de prótesis en cada paciente (Ascension Modular Radial Head). La puntuación media obtenida en la clasificación Mayo Elbow Performance Score fue de 88.29 ± 9.9 puntos. Durante el seguimiento tres pacientes (6.25%) sufrieron dolor continuo. Doce casos (25.5%) mostraron sobredimensión radiológica, aunque sólo cinco fueron sintomáticos. Se detectó osificación heterotópica en 27 casos (57.4%), 11 pacientes (23.4%) desarrollaron rigidez postoperatoria, 19 casos (40.42%) mostraron osteólisis periprotésica, de los cuales siete fueron sintomáticos, 13 pacientes (27%) presentaron complicaciones: tres casos de infección, cuatro casos de aflojamiento sintomático, dos neuroapraxias, una inestabilidad y tres casos de sobredimensionamiento con rigidez asociada. Nueve pacientes (18.75%) fueron reintervenidos. DISCUSIÓN: Presentamos 27% de complicaciones globales, principalmente relacionadas con la sobredimensión y el aflojamiento protésico y 19% de reintervenciones. Estos resultados son similares a los descritos en estudios previos con variaciones en función del tiempo de seguimiento. Asimismo, se requieren nuevos estudios para evaluar los resultados a largo plazo y la posible progresión de los hallazgos radiográficos. CONCLUSIÓN: En conjunto, estos datos ponen de manifiesto la necesidad de mejoría tanto de la técnica quirúrgica como del diseño de los implantes.

Protocolised surgical treatment of terrible triad of elbow. Results and complications. / Tratamiento quirúrgico protocolizado de las tríadas terribles de codo. Resultados y complicaciones.

BACKGROUND: Terrible triad of elbow is a complex lesion with a high rate of complications. Our goal is to analyse both clinical results and complications after performing protocolised surgery. MATERIAL AND METHODS: The database of our hospital was used during 2005-2015, collecting characteristics of the patient, the fracture, the surgery and the associated complications, as well as functional results and range of mobility. RESULTS: A total of 62 triads were obtained, of which 27 (43%) were women and 35 (56%) were men. All had a Kaplan lateral approach and those who needed it were complemented with a medial approach to repair the LCM. The radial head was synthesized in 14 (22%) cases, a prosthesis was placed in 45 (74%) cases and other actions in 3 (5%) cases. Osteosynthesis of the choroid process was performed by transosseous harpoon±suture in 41 (62%) patients and by synthesis in 12 (19%) cases. In 9 (14%) cases, no action was taken. In 100% of the cases the LCL was repaired and in 9 (14%) the LCM also had to be repaired. Twenty-two percent of the patients required ESA due to instability after the surgical technique. With respect to results, a range of mobility was obtained between 120°/-20° of flexoextension and 98°/85° of pronosupination. In terms of complications, we obtained a total of 17 (27%). CONCLUSIONS: Elbow triads are complex lesions where protocolised surgery is necessary, nevertheless the complication rate was 27% in our series.

Resurfacing arthroplasty as an alternative to the posttraumatic sequelae of fractures of the external column of the humerus in the young adult. / Artroplastia de resuperficialización como alternativa a las secuelas postraumáticas de la columna externa del húmero en el adulto joven.

Symptomatic posttraumatic arthritis of the elbow in young patients is a disorder for which there is currently no satisfactory solution. In this case report we show the evolution of a comminuted fracture of the capitellum with trochlear extension (McKee typeIV) treated initially with open reduction and internal fixation that eventually required a resurfacing hemiarthroplasty of the capitellum and reconstruction of the lateral ligament complex. After this surgical procedure, the patient had evident improvement of pain and of elbow range of motion, keeping the possibility of performing other rescue techniques open if they were to be necessary in the future.

Scaphoid-trapezium hereditary coalition. A case report. / Coalición carpiana escafotrapezoidea hereditaria. A propósito de un caso.

Carpal coalitions are relatively frequent between bones in the same carpal row. Coalitions between bones of different rows, however, are very uncommon. We present a case of bilateral intercarpal coalition between the trapezium and scaphoid as an incidental finding, confirming its hereditary origin since a parent has the same bilateral coalition.

Assessment of clinical parameters of the polytraumatized patient as predictors of hospital expenditure and of its distribution. / Valoración de parámetros clínicos del paciente politraumatizado como predictores del gasto hospitalario y de su distribución.

INTRODUCTION: Traumatic pathology continues to represent an important socio-health problem. The aim of the study was to assess the clinical predictors of total expenditure, as well as to analyze which components of the cost are modified with each clinical parameter of the polytraumatized patient. MATERIAL AND METHODS: Retrospective study of 131 polytrauma patients registered prospectively. A statistical analysis was carried out to assess the relationship between clinical parameters, the total cost and the cost of various treatment components. RESULTS: The total cost of hospital admission was 3,791,879 euros. The average cost per patient was € 28,945. Age and gender were not predictors of cost. The scales ISS, NISS and PS were predictors of the total cost and of multiple treatment components. The AIS of Skull and Thorax predicted a higher cost of admission to ICU and Total Cost. The AIS of lower limbs was associated with greater spending on facets of treatment related to surgical activity. DISCUSSION: There are clinical parameters that are predictors of the treatment cost of the polytraumatized patient. The study describes how the type of trauma that the patient suffers modifies the type of expenses that will present in their hospital admission. CONCLUSIONS: Polytraumatized patients with severe multisystem injury present increased costs in multiple components of the treatment cost. Patients with TBI or chest trauma present a higher cost for admission to ICU and those with orthopaedic trauma are associated with greater expenditure on surgical activity.

[Shoulder arthroplasty complications: case report]. / Complicaciones de la artroplastía de hombro: reporte de un caso.

BACKGROUND: Infection and instability are the complications of prosthetic shoulder surgery of more difficult management. Instability builds up to half of the cases, while the fungal infection accounts for less than 1% of all and can cause severe damage to bone and soft tissue. METHODS: In this case clinical fungal infection by Candida parapsilosis is presented in a shoulder hemiarthroplasty indicated by a fracture of the proximal humerus. He received surgical treatment in two-stages and administration of fluconazole for eight weeks prior to the second surgical time. In revision surgery was placed a reverse prosthesis as definitive treatment; however, the patient suffered several episodes of dislocation in the postoperative period; a second revision prosthetic surgery was necessary to use more stable components. During this surgery, we extracted samples that were analyzed, obtaining negative results for infection. RESULTS: Now after three years of follow-up, the patient is well, no limitations in their daily work and has a Constant Score of 50.5. DISCUSSION: We report our experience in this exceptional situation. We know, this is one of the first cases where the fungal infection and dislocation prosthetics in the same patient meet. This situation is a challenge for the surgeon, which has to treat complications two practically at the same time; we do not have scientific evidence to establish a criterion unified for the treatment of complications after surgery for revision of arthroplasty of the shoulder, especially in reverse or mega-denture prosthesis.

ANTECEDENTES: La infección e inestabilidad se encuentran entre las complicaciones de más difícil manejo en la cirugía protésica de hombro. La inestabilidad acumula hasta la mitad de los casos, mientras que la infección por hongos representa menos de 1% del total de infecciones y pueden causar daño severo a nivel óseo y de partes blandas. MÉTODOS: En este caso clínico se presenta una infección fúngica por Candida parapsilosis en una hemiartroplastía de hombro indicada por una fractura de húmero proximal. Se dio tratamiento quirúrgico en dos tiempos y administración de fluconazol durante ocho semanas previo al segundo tiempo quirúrgico. En la revisión se colocó una prótesis reversa como tratamiento definitivo; sin embargo, el paciente sufrió varios episodios de luxación en el postoperatorio. Fue necesaria una segunda cirugía de revisión protésica para sustituir por componentes de mayor estabilidad. Durante la misma, se extrajeron muestras que fueron analizadas, obteniéndose resultados negativos para infección. RESULTADOS: Actualmente tras tres años de seguimiento, el paciente se encuentra bien, sin limitaciones en su labor diaria y tiene un Constant Score de 50.5. DISCUSIÓN: Reportamos nuestra experiencia en esta situación excepcional. A nuestro conocer, éste es uno de los primeros casos en los que la infección fúngica y la luxación protésica coinciden en un mismo paciente. Esta situación es un reto para el cirujano, el cual tiene que tratar las dos complicaciones prácticamente a la vez. No se dispone de una evidencia científica para establecer un criterio unificado para el tratamiento de las complicaciones tras cirugía de revisión de artroplastía de hombro, especialmente en la prótesis reversa o megaprótesis.

Scaphoid Fractures treated with a volar percutaneous approach. Analysis and results in 92 cases. / Fracturas de escafoides tratadas con técnica percutánea volar. Análisis y resultados de 92 casos.

OBJECTIVE: Herbert type B1 and B2 scaphoid fractures can be treated by orthopaedic treatment or surgery. The aim of this study is to analyse results and complications of scaphoid waist fractures treated using the percutaneous volar approach. MATERIAL AND METHOD: We present a retrospective study of 92 patients, treated in our institution from 2006 to 2016 using a volar percutaneous fixation. Mean Follow-up was 16 months (range 12-48). Injuries were classified using Hebert's classification, including B1 and B2 fracture types; the other fracture types following this classification system were excluded. Politrauma patients, dorsal approach, fractures associated with distal radius injuries, patients treated using another surgical technique and patients with non follow-up were also excluded. Functional results were evaluated using the DASH questionnaire. Consolidation was established as the presence of bony bridges crossing the fracture site on x-rays, associated with absence of pain. RESULTS: The average time to fracture healing was 6.6 weeks (range 5-11). After 12 months of follow-up, the average wrist range of motion was 70° of extension (range 58-75) and 70° of flexion (range 62-80). Regarding functional evaluation, the average DASH questionnaire score was 42. The most frequent complication was non-union in 4 cases (4.44%). Average surgical time was 25min. CONCLUSIONS: Volar percutaneous fixation is a simple and quick technique for a specialist surgeon, characterised by low morbidity and complication rates compared to ORIF and orthopaedic treatment, which accelerates the patient's functional recovery.

[Femur fracture in a patient with dog-leg deformity secondary to arthrogryposis. Description of a unique osteosynthesis method]. / Fractura de fémur en un paciente con deformidad «dog-leg¼ secundaria a artrogriposis. Descripción de un método único de osteosíntesis.

The concept of arthrogryposis encompasses several conditions that share the presence of multiple congenital contractures. The knee is frequently involved and is an important cause of morbidity in these patients. Flexion contractures of the knee are the most common ones and have a worse prognosis than extension contractures. Different approaches are available to treat flexion contractures of the knee. Distal femoral extension osteotomy effectively corrects fixed flexion, but may lead to residual deformity. This iatrogenic deformity disrupts the anterior convexity of the femoral shaft and leads to serious problems in the subsequent management of orthopedic conditions. This is a case report of a patient with arthrogryposis and a femur deformity who sustained a supracondylar fracture. Managing the fracture was challenging due to a disruption in the normal architecture of the femur. This is a description of the osteosynthesis approach used to treat the fracture and the patients pre-existing deformity.

El concepto «artrogriposis¼ agrupa varias enfermedades cuya característica común es la presencia de múltiples contracturas congénitas. La rodilla se afecta con frecuencia y es causa importante de morbilidad en estos pacientes. Las contracturas en flexión de la rodilla son más comunes y tienen peor pronóstico que las contracturas en extensión. Existen diferentes técnicas de tratamiento para la contractura en flexión de la rodilla; la osteotomía distal de extensión femoral corrige eficazmente la flexión fija, pero puede dar lugar a una deformidad residual. Esta deformidad iatrogénica altera la convexidad anterior de la diáfisis femoral y conlleva problemas graves en el manejo posterior de patología ortopédica. Se presenta el caso de una paciente con artrogriposis y una deformidad en fémur con una fractura en la región supracondílea. El manejo de la fractura fue dificultoso por la presencia de una distorsión de la arquitectura normal del fémur. En nuestro trabajo se describe el método de osteosíntesis utilizado para hacer frente a la fractura y a la deformidad previa de la paciente.

Complicaciones a mediano plazo de la prótesis monopolar modular de cabeza radial / Mid-term complications of the monopolar, modular radial head prosthesis

Resumen: Introducción: El objetivo de este estudio es evaluar el tipo, la frecuencia y la gravedad de las complicaciones después de la implantación de la prótesis monopolar modular de cabeza radial. Material y métodos: Se revisaron retrospectivamente 47 pacientes con 48 prótesis de cabeza radial implantadas entre 2009 y 2017 durante una media de 43.55 meses (rango: 12-89). Resultados: Se implantó el mismo tipo de prótesis en cada paciente (Ascension Modular Radial Head) . La puntuación media obtenida en la clasificación Mayo Elbow Performance Score fue de 88.29 ± 9.9 puntos. Durante el seguimiento tres pacientes (6.25%) sufrieron dolor continuo. Doce casos (25.5%) mostraron sobredimensión radiológica, aunque sólo cinco fueron sintomáticos. Se detectó osificación heterotópica en 27 casos (57.4%), 11 pacientes (23.4%) desarrollaron rigidez postoperatoria, 19 casos (40.42%) mostraron osteólisis periprotésica, de los cuales siete fueron sintomáticos, 13 pacientes (27%) presentaron complicaciones: tres casos de infección, cuatro casos de aflojamiento sintomático, dos neuroapraxias, una inestabilidad y tres casos de sobredimensionamiento con rigidez asociada. Nueve pacientes (18.75%) fueron reintervenidos. Discusión: Presentamos 27% de complicaciones globales, principalmente relacionadas con la sobredimensión y el aflojamiento protésico y 19% de reintervenciones. Estos resultados son similares a los descritos en estudios previos con variaciones en función del tiempo de seguimiento. Asimismo, se requieren nuevos estudios para evaluar los resultados a largo plazo y la posible progresión de los hallazgos radiográficos. Conclusión: En conjunto, estos datos ponen de manifiesto la necesidad de mejoría tanto de la técnica quirúrgica como del diseño de los implantes.

Abstract: Introduction: The objective of this study is to assess the type, frequency and severity of complications after the implantation of the modular monopolar radial head prosthesis. Material and methods: Forty-seven patients with 48 radial head prostheses implanted between 2009 and 2017 were reviewed retrospectively. Patients were evaluated clinical and radiographically for a mean follow-up of 43.55 months (range: 12-89). Results: The same type of prosthesis was implanted in every patient (Ascension Modular Radial Head). The average score in the Mayo Elbow Performance Score was 88.29 ± 9.9 points. During the follow-up, three patients (6.25%) suffered from continuous pain. Twelve cases (25.5%) showed radiological oversizing, though only five were symptomatic. Heterotopic ossification was detected in twenty-seven cases (57.4%). Eleven patients (23.4%) developed postoperative stiffness. Nineteen cases (40.42%) showed periprosthetic osteolysis, from which seven were symptomatic. Thirteen patients (27%) developed surgery-related complications: three cases of infection, four cases of symptomatic loosening, two neurapraxies, one instability and three cases of oversizing with associated stiffness. Nine patients (18.75%) required reintervention. Discussion: Our study obtains a 27% of overall complications, mostly related to oversizing and prosthetic loosening, and 19% of reinterventions. These results are similar to those presented in previous studies, with variations depending on the time of follow-up. Further research is also required to evaluate long-term results and the potential progression of the radiographic findings. Conclusion: Taken together, these data stress the need for improvement in both the surgical technique and the design of the implants.

[Peroneal tendoscopy: our experience]. / Tendoscopia de los peroneos: nuestra experiencia.

BACKGROUND: The peroneal tendon pathology is a common cause of posterolateral ankle pain. Recently, the incidence and awareness of this disease and its treatment are booming thanks to the development of tendoscopic procedures. OBJECTIVE: To describe and assess the current role and indications of tendoscopy for peroneal tendon pathology. MATERIAL AND METHODS: From June 2010 to July 2011, twenty three patients with retrofibular pain were treated with peroneal tendoscopy. We founded twelve peroneal brevis tendon tears, six peroneal longus tendon tears, three cases of tenosynovitis and two cases of luxation, one patient with an intrasheath subluxation and another one of extrasheath. Of the 23 patients, 12 had another injury associated: 4 talar osteochondral lesions, 3 instabilities and 7 cases of soft tissue impingement. DISCUSSION: The three main indications include tendon tears, tenosynovitis and subluxation or luxation. It is a technically demanding procedure that requires extensive experience in arthroscopic management of small joints and can be particularly complex in cases of wide tenosynovitis, broad tendon tears or anatomical defects but very useful for the evaluation of the lesions and for the treatment of peroneal tendon disorders. CONCLUSIONS: Tendoscopy is a useful procedure with low morbidity and excellent functional results to treat the pathology of the peroneal tendons.

Complicaciones de la artroplastía de hombro: reporte de un caso / Shoulder arthroplasty complications: case report

Resumen: Antecedentes: La infección e inestabilidad se encuentran entre las complicaciones de más difícil manejo en la cirugía protésica de hombro. La inestabilidad acumula hasta la mitad de los casos, mientras que la infección por hongos representa menos de 1% del total de infecciones y pueden causar daño severo a nivel óseo y de partes blandas. Métodos: En este caso clínico se presenta una infección fúngica por Candida parapsilosis en una hemiartroplastía de hombro indicada por una fractura de húmero proximal. Se dio tratamiento quirúrgico en dos tiempos y administración de fluconazol durante ocho semanas previo al segundo tiempo quirúrgico. En la revisión se colocó una prótesis reversa como tratamiento definitivo; sin embargo, el paciente sufrió varios episodios de luxación en el postoperatorio. Fue necesaria una segunda cirugía de revisión protésica para sustituir por componentes de mayor estabilidad. Durante la misma, se extrajeron muestras que fueron analizadas, obteniéndose resultados negativos para infección. Resultados: Actualmente tras tres años de seguimiento, el paciente se encuentra bien, sin limitaciones en su labor diaria y tiene un Constant Score de 50.5. Discusión: Reportamos nuestra experiencia en esta situación excepcional. A nuestro conocer, éste es uno de los primeros casos en los que la infección fúngica y la luxación protésica coinciden en un mismo paciente. Esta situación es un reto para el cirujano, el cual tiene que tratar las dos complicaciones prácticamente a la vez. No se dispone de una evidencia científica para establecer un criterio unificado para el tratamiento de las complicaciones tras cirugía de revisión de artroplastía de hombro, especialmente en la prótesis reversa o megaprótesis.

Abstract: Background: Infection and instability are the complications of prosthetic shoulder surgery of more difficult management. Instability builds up to half of the cases, while the fungal infection accounts for less than 1% of all and can cause severe damage to bone and soft tissue. Methods: In this case clinical fungal infection by Candida parapsilosis is presented in a shoulder hemiarthroplasty indicated by a fracture of the proximal humerus. He received surgical treatment in two-stages and administration of fluconazole for eight weeks prior to the second surgical time. In revision surgery was placed a reverse prosthesis as definitive treatment; however, the patient suffered several episodes of dislocation in the postoperative period; a second revision prosthetic surgery was necessary to use more stable components. During this surgery, we extracted samples that were analyzed, obtaining negative results for infection. Results: Now after three years of follow-up, the patient is well, no limitations in their daily work and has a Constant Score of 50.5. Discussion: We report our experience in this exceptional situation. We know, this is one of the first cases where the fungal infection and dislocation prosthetics in the same patient meet. This situation is a challenge for the surgeon, which has to treat complications two practically at the same time; we do not have scientific evidence to establish a criterion unified for the treatment of complications after surgery for revision of arthroplasty of the shoulder, especially in reverse or mega-denture prosthesis.

Fractura de fémur en un paciente con deformidad « dog-leg ¼ secundaria a artrogriposis. Descripción de un método único de osteosíntesis / Femur fracture in a patient with dog-leg deformity secondary to arthrogryposis. Description of a unique osteosynthesis method

Resumen: El concepto «artrogriposis¼ agrupa varias enfermedades cuya característica común es la presencia de múltiples contracturas congénitas. La rodilla se afecta con frecuencia y es causa importante de morbilidad en estos pacientes. Las contracturas en flexión de la rodilla son más comunes y tienen peor pronóstico que las contracturas en extensión. Existen diferentes técnicas de tratamiento para la contractura en flexión de la rodilla; la osteotomía distal de extensión femoral corrige eficazmente la flexión fija, pero puede dar lugar a una deformidad residual. Esta deformidad iatrogénica altera la convexidad anterior de la diáfisis femoral y conlleva problemas graves en el manejo posterior de patología ortopédica. Se presenta el caso de una paciente con artrogriposis y una deformidad en fémur con una fractura en la región supracondílea. El manejo de la fractura fue dificultoso por la presencia de una distorsión de la arquitectura normal del fémur. En nuestro trabajo se describe el método de osteosíntesis utilizado para hacer frente a la fractura y a la deformidad previa de la paciente.

Abstract: The concept of arthrogryposis encompasses several conditions that share the presence of multiple congenital contractures. The knee is frequently involved and is an important cause of morbidity in these patients. Flexion contractures of the knee are the most common ones and have a worse prognosis than extension contractures. Different approaches are available to treat flexion contractures of the knee. Distal femoral extension osteotomy effectively corrects fixed flexion, but may lead to residual deformity. This iatrogenic deformity disrupts the anterior convexity of the femoral shaft and leads to serious problems in the subsequent management of orthopedic conditions. This is a case report of a patient with arthrogryposis and a femur deformity who sustained a supracondylar fracture. Managing the fracture was challenging due to a disruption in the normal architecture of the femur. This is a description of the osteosynthesis approach used to treat the fracture and the patient's pre-existing deformity.