Comparison of functional outcomes among subtypes of Fraser's type Ⅱ floating knee / 中华创伤杂志(英文版)

PURPOSE@#The poor prognosis in patients with floating knee injuries is mainly contributed to articular involvement (Fraser's type Ⅱ). This study aims to evaluate and compare the functional outcomes among different Fraser's type Ⅱ floating knee injuries after surgical management.@*METHODS@#Twenty-seven patients with Fraser's type Ⅱ floating knee injuries (54 fractures) between September 2014 and December 2015 were enrolled prospectively in this study and were distributed according to Fraser's floating knee classification into three different groups as type ⅡA (ipsilateral femoral shaft and tibial intra-articular involvement, n = 11), type ⅡB (ipsilateral tibial shaft and femoral intra-articular involvement, n = 9) and type ⅡC (both femoral and tibial intra-articular involvement, n = 7). The differences among the groups were evaluated and compared. The functional outcomes of these injuries at one year were analyzed using Knee Injury and Osteoarthritis Outcome Score (KOOS) which covers 5 subscales of pain, other symptoms, activities of daily living, sports and recreation, and quality of life. The result was also compared with standardized age-sex matched healthy population using paired samples t-test.@*RESULTS@#All the patients were male, and the injury mechanism was solely roadside accident. The mean age was 29.8 years and injury severity score 17.9 (comparable in all the three groups). Most injuries were observed on the right side (20 cases, 74.1%). Based on paired samples t-test, the KOOS score of patients with Fraser's type ⅡA was found to be better than that of type ⅡB and type ⅡC. Compared with the reference age-sex matched control group, patients with Fraser's type ⅡB and ⅡC fractures had significantly lower mean score in all KOOS subscales (all p < 0.01). However, Fraser's type ⅡA only revealed significant difference regarding the subscales of activities of daily living (p < 0.0001), sports and recreation (p < 0.0001), and quality of life (p < 0.0001).@*CONCLUSION@#The results of this study show that patients with Fraser's type ⅡA fractures had a better functional outcome as compared to those with type ⅡB and ⅡC fractures. This might be due to the open intra-articular involvement of the distal femur of the latter two fracture types.

Clavo Intramedular de Sign en Rodilla Flotante: Una serie de casos / Sign Intramedullary Nail in 'Floating Knee". A Case Series Report.

INTRODUCCIÓN: El concepto de "rodilla flotante" describe fracturas ipsilaterales del fémur y la tibia, donde la rodilla está desconectada del resto de la extremidad. El mecanismo suele ser un trauma de alta energía. Las tasas de infección, no unión, malunión y rigidez de la rodilla, pérdida excesiva de sangre, embolia grasa, son relativamente altas; lo que lleva a un deterioro funcional y con frecuencia resultados no satisfactorios. La reducción definitiva inmediata y fijación de las fracturas por clavo intramedular disminuye la incidencia de complicaciones. MATERIALES Y MÉTODOS: Se realizó un estudio descriptivo, serie de casos de 7 pacientes tratados con el Clavo Intramedular de SIGN (Surgical Implant Generation Network); para establecer resultados funcionales, lesiones concomitantes, complicaciones y ventajas del clavo en nuestra práctica. RESULTADOS: La mayoría de pacientes fueron del sexo masculino, con una media de 26 años de edad. Todas las lesiones fueron producidas en accidentes de tráfico, el 50% de las fracturas fueron expuestas. Según la clasificacion de Blake & McBryde, 6 fueron de Tipo I y un caso tipo IIa. Los resultados funcionales se evaluaron según los criterios de Karlström&Olerud; excelentes y buenos resultados se obtuvieron en el 85% de los casos. Todas las fracturas consolidaron; se describe un caso de infección superficial y un paciente presentó acortamiento de miembro <3cms y limitación menor del rango de movilidad de la rodilla. CONCLUSIÓN: El CIM de SIGN resultó eficiente y versátil en el tratamiento de rodilla flotante en adultos. Con buenos resultados funcionales (85%) y baja incidencia de complicaciones.

BACKGROUND: "Floating knee" describes ipsilateral fractures of the femur and tibia, where the knee is disconnected from the rest of the limb. The mechanism is usually a high-energy trauma. Rates of infection, lack of union, stiffness of the knee, excessive blood loss, fat embolism, are relatively high; leading to functional impairment and often unsatisfactory results. Immediate definitive reduction and fixation of fractures by intramedullary nail reduces the incidence of complications. METHODS: A descriptive study was carried out, a case series report of 7 patientes treated by the SIGN Intramedullary Nail (IMN); to establish the functional results, concomitant injuries, complications and advantages of this nail, in our practice. RESULTS: The majority of the patients were male, with a mean age of 26 years. All injuries were caused in traffic accidents, 50% of the fractures were exposed fractures. According to the Blake & McBryde classification, 6 were Type I and one case Type IIa. Functional results were evaluated according to the Karlström and Olerud criteria; excellent and good results were obtained in 85% of cases. All of the fractures healed; one case of superficial infection was described, one patient presented limb shortening <3 cm and minor limitation of the knee motion range. CONCLUSION: The SIGN intramedullary nail, was efficient and versatile for the treatment of floating knee in adults. It had good functional results (85%) and low incidence of complications.

Outcomes of Surgical Management of Floating Knee Injuries

Introduction: Floating knee, referred to as ipsilateralfractures of the femur and tibia, is usually associated withseveral complications and mortality. This study was designedto present our experience with treatment of this injury.Demographic parameters like age, sex, mechanism of injury,associated injuries, method and results of treatment, andcomplications of floating knee are discussedMaterial and Methods: This Prospective study wasperformed between January 2014-July 2016. All patientswith floating knee injuries who were admitted to the PMCHfulfilling the inclusion and exclusion criteria were included.The information about the 20 cases of floating knee injurieswere gathered, particularly the demographic parameters, modeof injury, bones involved, condition of skin, other associatedinjuries and their neurovascular status. The patients werefollowed for a minimum of one year duration and functionaloutcome was assessed.Result: Most of the patients were between 21-30years of age(45%). The floating knee injuries were more common in males(85%). FraserType I fracture was observed in 70% of cases.Roadtraffic accidents(RTA) was the most common cause ofsuch injuries. 18 out of 20(90%) cases were having associatedinjuries while only 10%were cases of isolated floating knee.The most common early and late complications were infectionand knee stiffness respectively. The final outcome as perKarlstrom criteria was excellent and good in 11 out of 14 casesof Fraser type I fracture and in 3 out of 6 cases of Fraser type IIfracture, and this was statistically significant (P=0.05).Conclusion: This study revealed that the complication rateassociated with floating knee injuries remain high and theprognosis mostly depends on type of injury and associatedinjuries. This study also advocates early aggressive approachfor management of these injuries.

Rodilla Flotante: modificación de la clasificación de Fraser y factores asociados con los resultados funcionales / Floating knee: modification on the Fraser classification and factors associated with functional results

Introducción Los casos de rodilla flotante son secundarios a traumas de alta energía, lo que conlleva altas tasas de complicaciones y múltiples patrones de fractura. Este estudio introduce una modificación de la Clasificación de Fraser e identifica factores relacionados con los resultados funcionales. Métodos Se realizó un estudio de cohorte ambidireccional con pacientes diagnosticados con rodilla flotante manejados entre los años 2008 al 2012 en un hospital de referencia. Se recolectaron variables demográficas, presencia de lesión vascular, infección y fracturas abiertas. Se utilizó una modificación de la Clasificación de Fraser para clasificar las fracturas óseas. La Clasificación de Fraser Modificada (CFM) abarcó la siguiente distribución: Tipo I, Tipo II A, Tipo II B y Tipo II C, además de adicionar los Tipos III A, III B y III C. Se evaluó la correlación entre la funcionalidad y la CFM. Se utilizaron los criterios de Karlstrom y Olerud para evaluar la funcionalidad. Resultados Se incluyeron 34 pacientes en el estudio, 30 (88%) hombres y 4 (12%) mujeres con un promedio de edad de 32 años±10,3. Según la CFM las fracturas Tipo II A con 15 (44%) casos y la Tipo I con 13 (38%) casos fueron las fracturas más comunes. 17 (50%) pacientes presentaron un resultado excelente, 3 (9%) bueno, 5 (15%) aceptable y 9 (26%) pobre. Se encontró una correlación moderada entre un resultado pobre y la Clasificación de Fraser Modificada (rho=0.42, p=0.046). La edad ≥ 40 años (OR 6.7 IC 95% 1.1 ­ 41, p=0.03) y la infección en la extremidad inferior afectada (OR 7.2 IC 95% 1.5 ­ 33, p=0.01), se asociaron con un resultado funcional aceptable/pobre. Discusión La Clasificación de Fraser Modificada incluye más patrones de fractura en comparación con la clasificación de Fraser original, permitiendo una mejor caracterización radiológica de las fracturas, con una correlación moderada con los resultados funcionales. La edad ≥ 40 años y la infección en la extremidad comprometida, se asociaron con un resultado funcional aceptable/pobre.

Background Floating Knee is due to high energy trauma, with high rates of complications and multiple patterns of fractures. A modification of the Fraser Classification is introduced, and identifies factors associated with functional outcomes. Methods An ambidirectional cohort study was conducted in a referral teaching hospital during 2008 and 2012. Demographic variables, vascular lesion, infection, and open fractures were recorded. A modification of the Fraser Classification was used to classify the fractures. The Modified Fraser Classification (MFC) encompasses the following distribution: Type I, Type II A, Type II B, and Type II C, and Type III A, Type III B, and Type III C, was added. The correlation between functionality and the MFC was assessed. The Karlstrom and Olerud criteria were used to determine the functional outcome. Results A total of 34 patients were included, of whom 30 (80%) were males and 4 (12%) females. The mean age was 32 years±10.3. According to the MFC, the Type II A (n=15 - 44%) and Type I (n=13 - 38%) were the most common. The functionality outcomes of the patients were Excellent in 50% (17), Good in 9% (3), Acceptable in 15% (5), and Poor in 26% (9). There was a moderate correlation between poor outcomes and the Modified Fraser Classification (rho=0.42, P=0.046). Age ≥ 40 years (OR 6.7, 95% CI; 1.1 ­ 41, P=0.03) and infection (OR 7.2, 95% CI; 1.5 ­ 33, P=0.01) were associated with acceptable/poor results. Discussion The Modified Fraser Classification includes more patterns of fractures in comparison with the original Fraser Classification, allowing for a better characterisation of the patients, with moderate correlation with functional outcomes. Age ≥ 40 years and infection were associated with an acceptable/poor result.

Treatment of floating knee injury in children with elastic intramedullary nail / 中国骨伤

OBJECTIVE@#To observe the clinical effect of elastic intramedullary nail in minimally invasive treatment of floating knee injury in children.@*METHODS@#From January 2009 to September 2017, 11 children with floating knee injury were treated with one-off open reduction and elastic intramedullary nail or external fixator fixation, including 7 males and 4 females, aged 5.0 to 11.0 years, with an average age of 8.3 years. The treatment results were evaluated according to karlstrom's standard.@*RESULTS@#Eleven patients were followed up for 8 to 48 months, with an average of 28 months. All the fractures healed at one time, and there were no complications such as nonunion, malunion and serious dysfunction of knee joint. The length of the affected limb in 2 cases was 1.2 to 1.5 cm longer than that in the opposite side without shortening. According to Karlstrom scoring standard, 8 cases were excellent, 1 case was good and 2 cases were middle.@*CONCLUSION@#Elastic intramedullary nail minimally invasive treatment of floating knee injury in children is a safe and effective treatment, which can effectively reduce the fracture and promote bone healing, which is conducive to early functional recovery.

Comparison of Floating Knee according to Presence of Knee Joint Injury

PURPOSE: To compare the clinical outcomes of floating knee according to the presence of knee joint injury. MATERIALS AND METHODS: Between March 2004 and March 2009, we investigated 36 patients, who underwent surgical treatment for floating knee injuries. We classified the floating knee into two groups as type I (12 cases) has no knee joint injury and type II (24 cases) has knee joint injury. We compared two groups about combined injury (orthopedics or other part), open fracture or not, neurovascular injury,union time, range of motion, and complication rate. RESULTS: There is statistically no significant difference between two groups as type I (6 cases, 50%) and type II (13 cases, 54.2%) in orthopedic combined injury (p=0.813), and also same as type I (3 cases, 25%) and type II (12 cases, 50%) in combined injury on the other department (p=0.151), and in floating knee with open fracture as 4 type I (33%) and 12 type II (50%) of 16 cases (44%), and Gustilo-Anderson 3 type I, 4 type II, 1 IIIA, 4 IIIB, and 4 IIIC (p=0.423). There is statistically no significant difference between two groups in neurovascular injury as 1 type I (8.3%), and 3 type II (12.5%) (p=0.708). There is a statistically significant difference between two groups in the mean bone union time as 18.2+/-5.37 weeks (12~24 weeks) for type I and 24.95+/-9.85 weeks (16~33 weeks) for type II (p=0.045), and in the mean range of knee joint motion as 133+/-12.74 degree (120~150 degree) for type I and 105+/-19.00 degree (80~135 degree) for type II (p=0.012). CONCLUSION: Floating knee with knee joint injury is severe itself and related with severe combined injuries, subsequent range of knee joint motion limitation, the delay of union time, and high complication rate. Therefore, we should take care in surgical treatment for this trauma entity.

Rodilla flotante: epidemiología y evolución funcional postoperatoria / Floating knee: epidemiology and postoperatory functional evolution

Se denomina rodilla flotante a la combinación de fracturas de fémur y de tibia ipsilateral, como resultado principalmente a traumas de alta energía, frecuente en accidentes viales y la mortalidad supera el 10%. Se presenta con mayor incidencia en jóvenes de edades productivas. Ameritan un abordaje multidisciplinario y manejo quirúrgico complejo, la estadia intrahospitalaria es prolongada. El presente estudio descriptivo, longitudinal, retrospectivo, incluye 20 pacientes, pretende describir el marco epidemiológico de esta patología y conocer la evolución funcional de los diversos tratamientos establecidos en nuestro hospital, durante el periodo enero 2008 a enero 2010. Entre los resultados obtenidos la mayor incidencia fue del sexo masculino, en edades entre 15 y 35 años. La principal causa fue accidente en moto. La distribución del tipo de fractura según Fraser fue equitativo y las lesiones asociadas considerablemente elevadas. Se realizó estabilización primaria con fijación externa en 55% de los casos. La evolución funcional según Karlstromy Olerud fue regulara pobre, relacionándose con las principales complicaciones. A través del estudio se visualiza la rodilla flotante como un problema de dimensiones crecientes, según el incremento en los accidentes de alta energía; que no solo compete al equipo médico, sino también a los diversos entes gubernamentales, a quienes recomendamos su efectiva intervención.

Its designated floating knee to a combination of femoral and fibular ipsilateral fractures, as a result of high energy trauma which more common cause are road accidents, a mortality that overcomes a 10%. The main incidence it’s present in young in productive ages. demands a multidisciplinariyaproach and its surgical handle is complex, the intrahospitalary stay is long. The present is an descriptive, longitudinal, retrospective, research, that includes 20 patient and pretends to describe the epidemiológical frame of this pathology as well as knowing the functional evolution of the diverse treatments established in our hospital during the period January 2008 to January 2010. Among the results was the higher incidence of males, aged between 15 and 35 years. The main cause was an accident on a motorcycle. The distribution to type of fracture Fraser´s was fair and substantially higher associated injuries. Was perform external estabilitation primary in 55% of cases. The funtional evolution in accordance with Karlstrom and Olerud was fair to poor, relate to with major complications. Through the study floating knee is displayedas a problem of increasing dimensions, according to the increase in high-energy accidents, not only the responsibility of the medical team, but also to various government bodies, who recommend their effective intervention.

Surgical Management of Ipsilateral Fracture of the Femur and Tibia in Adults (the Floating Knee): Postoperative Clinical, Radiological, and Functional Outcomes

BACKGROUND: This study evaluated the outcomes of surgical management of ipsilateral femoral and tibial fractures in adults. METHODS: Fifteen patients (13 men, 2 women; mean age, 34.8 years; range, 18 to 65 years) were enrolled in this study. The fractures types were classified according to the classification by Fraser et al. as follows: type I (5), type IIa (3), IIb (4), IIc (3). Femur fractures were treated using locked intramedullary nails, plate-screws, or dynamic condylar screws, and tibia fractures were treated with an external fixator (in open fractures), or plate-screws, and locked intramedullary nailing. The mean follow-up duration was 2.2 years (range, 1.3 to 4 years). RESULTS: The extent of bony union according to the Karlstrom criteria was as follows: excellent, 8; good, 4; acceptable, 2; poor, 1. CONCLUSIONS: The associated injuries and type of fracture (open, intra-articular, comminution) are prognostic factors in a floating knee. The best management of the associated injuries for good final outcome involves intramedullary nailing of both the fractures and postoperative rehabilitation.

Treatment of Fraser type Ⅰ floating knee injuries with double intramedullary nail under minimally invasive surgery / 中华创伤杂志

Objective To discuss role of double intramedullary nail in the treatment of floating knee injuries under minimally invasive surgery.Methods From July 2006 to July 2010,23 patients with floating knee injuries ( Fraser type Ⅰ ) were fixed with tibial intramedullary nail and femoral retrograde intramedullary nail assisted by minimally invasive method such as portable bracket,AO large distractor and Schanz screw.The postoperative continuous passive motion (CPM) was performed for functional exercises of the knee.Results The operation lasted for average 95 minutes ( range,70-160 minutes),with average blood loss of 260 ml ( range,100-600 ml).All patients were followed up for average 11 months (range,7-35 months).According to assessment systems of Karlstrom and Olerud,the clinical results were excellent in 17 patients,good in 4 and fair in 2,with excellence rate of 91％.Conclusions Combined with the methods of portable bracket of lower limb,AO large distractor and Schanz screw,the intramedullary nail is much convenient and minimally invasive for the floating knee injuries.

Estudio de Rodilla Flotante en pacientes del Hospital Clínico Viedma / Floating Knee Study in Patients of Hospital Clínico Viedma

Se denomina "Rodilla Flotante" a la combinación de fractura de fémur y tibia ipsilaterales. La incidencia exacta se desconoce, pero tiene un abordaje terapéutico complejo, una alta tasa de complicaciones y una elevada mortalidad. El presente estudio busca determinar los aspectos relacionados con esta patología en nuestro medio y analizarlos de una manera integral, realizándose para esto un estudio descriptivo y longitudinal retrospectivo abarcando 18 meses (de julio 2008 a diciembre 2009) que incluye a 17 pacientes con diagnóstico de "Rodilla Flotante" ingresados en el Servicio de Ortopedia y Traumatología del Hospital Clínico Viedma. Los resultados mostraron que esta lesión equivale al 1,9 % de los casos atendidos por este servicio. Siendo el 82,35% hombres. La edad promedio fue de 34 años. El mecanismo de producción más frecuente: accidentes en motocicleta (41,2%), seguido de atropellados (29,4%). En cuanto a la clasificación la mayor parte fue tipo I de Fraser (68,8%). El tratamiento quirúrgico definitivo se aplicó entre el 5º y 14° día en el 73.3%, mayormente usando clavos centro medulares en fémur y tibia. Los resultados del tratamiento fueron: excelentes 40%, buenos 33.3%, regulares 20% y pobres en el 6,6% según la escala de Karlstrom y Olerud. Las lesiones asociadas:TEC (80%), fracturas de pelvis (60%), trauma abdominal cerrado (60%) y trauma de tórax (33,3%). Dentro de las complicaciones, un paciente falleció por falla multiorgánica, otro concluyó en amputación, y cinco presentaron infección. Por lo que se concluye que en general los aspectos relacionados con esta patología, su presentación y tratamiento en nuestro medio, son similares a los que se encuentran descritos en la literatura médica.  .

"Floating knee" refers to the combination of fracture of femur and tibia ipsilateral .The exact incidence is unknown, but has a complex therapeutic approach, a high rate of complications and high mortality. This study pretends to determine aspects of this disease in our environment and to analyze them in a comprehensive manner, making this a retrospective descriptive study longitudinal spanning 18 months (from July 2008 to December 2009) includes 17 patients with diagnosis of "Floating knee" entered in the service of Orthopedics and Traumatology of the Hospital Clinico Viedma. The results showed that this injury is equivalent to 1.9% of the cases covered by this service. 82.35% corresponds to men.The middle age was 34 years. The most common mechanism: motoreyele accident (41,18%), followed by hasty (29.41%). The most common classification was Fraser type I (68.82%). The definitive surgical treatment apply between 5º and 14° day on the 73.3%, mostly using medullar center nail in femur and tibia. The results of the treatment were: excellent 40%, good 33.3%, regular 20% and poor in 6.6 % according to the scale of Karlstrom and Olerud. Associated injuries: TEC (80%), fracture of pelvis (60%), closed abdominal trauma (60%) and chest trauma (33.3%). In the complications, one patient died of multiorganic fail, another concluded in amputation, and five presented infection. The research group concluded that aspects of this disease, its presentation and treatment in our environment, are in general similar to those that are described in the medical literature.

Treatment of Floating Knee Injury in Children / 华中科技大学学报（医学）（英德文版）

The necessity and superiority of the surgical operation on children with floating knee injury and the fracture union and complications were investigated. Twenty-eight children with floating knee injury were subjected to open reduction and internal fixation or external fixator. The patients were followed up for 18 months to 7 years. The curative effectiveness was scored by Karlstrom criteria. The results showed that no nonunion or deformity was found. The affected limb was 1.2 cm to 1.5 cm longer in 2 cases, 0.8 to 1.2 cm shorter in 3 cases than the contralateral. No severe dysfunction of knee joint occurred. The excellent-good rate was 92.8 % and the curative rate 71.4 % respectively. So for children whose age is older than 5 years, it's a good way to treat the fractures of femur and tibia with open reduction and internal fixation or external fixator. The method can be advantageous for the nursing care, early function recovery, shortening of the hospital stay and avoidance of severe complications.

Management of Ipsilateral Femur and Tibia Fractures, with Retrograde and Antegrade Nailings from the Knee

PURPOSE: To review the results in the management of ipsilateral femur and tibia fractures, using femoral and tibial intramedullary nailings with single incision on the knee. MATERIALS AND METHODS: We treated 19 cases of ipsilateral femur and tibia fractures (floating knee), and the retrograde femoral nailing and antegrade tibial nailing were done with single incision on the knee. Except one patient of early death, 18 patients were included in this study. The mean age of index procedure was 34.1 years, and all of them had follow-up study for a mean of 2.4 years. The mean injury severity score was 18.8, and 12 patients had other fractures in the lower extremity. RESULTS: Primary union was achieved in all, but one patient of femur and two of tibia. The average period for union was 27.6 weeks for femur and 24.5 weeks for tibia. One femoral nonunion occurred due to the metal failure after using short nail, and two tibial nonunion were caused by the bone loss with open tibial fractures. Most patients showed no limitation in knee motion. According to Karlstrom-Olerud criteria, functional results showed 14 excellent, 3 good and 1 acceptable. The protrusion of nail tip into the knee joint made the acceptable result with moderate limitation of knee motion, but it improved after the removal of nail. CONCLUSION: CONCLUSION: Simultaneous retrograde femoral and antegrade tibial nailing with single incision on the knee, with an appropriate technique, can achieve the satisfactory result in the management of the ipsilateral femur and tibia fractures.

A Clinical Study of Ipsilateral Fracture of the Femur and Tibia / 대한정형외과학회잡지

Ipsilateral fracture of the femur and tibia is also called “floating knee”. And it is well known that its treatment is difficult and functional result is poor in most cases because it has often comminuted, open fracture with severe soft tissue injuries. Authors reviewed 20 cases in 18 patients which were treated from September 1989 to March 1993. All were followed for more than one year. The results were as follows: 1. Among 20 cases of femoral fracture, 15 cases were treated with internal fixation and others with external fixation and among 18 cases of tibial fracture(2 amputations excluded), internal and external fixation were equal in number. 2. The bony union time was shorter in the intramedullary nailing than the plate and screws, and external fixations. 3. The end result was better in Group I(internal fixation for both fracture) than Group II (one or both fractures were treated with external fixator) because the femur had less severe comminution, and soft tissue injuries. 4. There were many complications in Group II than Group I, That is, wound infections, delayed union or non-unions. There were 11 operations for the treatment of complications,.

The Clinical Study on Ipsilateral Fracture of the Femur and Tibia / 대한정형외과학회잡지

The "flosting knee" is the term applied to the flail knee joint segment resulting from a fracture of the shaft of adiacent metanhysis of the ipsilateralfemur and tibia. The various methods of treatment of the "floating knee" were adapted by many authors according to degree of the comminution, degree of the soft tissue injury, general condition state of the fracture. Authors experienced the floating knee in 52 cases on 51 patients who were treated at Soon Chun Hyang University Hospital in the period of 4 years and 5 months from January 1985 to June 1989 and among them, 45 cases were treated by operative method and 7 cases by conservative methods at least one of the femur and tibia, The results were as follews;1. Floating Knee occured six times more in male and the peak age was third and fourth decades. 2. The most common cause of fractures was traffie aecident and there was difficulty in diagnosis of ligamentous disruption of the ipsilateral knee. 3. The common fracture site were middle one third and the most common fracture shape was comminuted in both femur and tibia. 4. A good or excellent functional result was aohieved in treated with open reduction and rigid fixation of both fracture and there were no significant difference in group of the internal fixation of both femur and tibia. 5. Intramedullary nailing on the femur and plate fixation on the tibia provided rigid fixation of fracture and the it made possible early joint motion exercise and ambulation and the average healing time of fracuture was much shortened. 6. The most common concomitant injury were soft tissue injury and delayed or nonuion and osteomyelitis were developed more frequently in the plate and screw fixation group of the open fracture.