Long-term results of synovectomy in total knee arthroplasty: a prospective, randomized controlled trial / 中华医学杂志(英文版)

BACKGROUND@#Synovectomy has been introduced into total knee arthroplasty (TKA) with the aim of relieving pain and inflammation of the synovium. However, there are no long-term, comparative data to evaluate the effect of synovectomy in TKA. This study was aimed at assessing pain, function, and complications in patients undergoing synovectomy during TKA for osteoarthritis (OA) at long-term follow-up.@*METHODS@#This was a prospective randomized controlled trial of 42 consecutive patients who underwent staged bilateral TKA. Patients undergoing the first-side TKA were allocated to receive TKA with or without synovectomy followed by a 3-month washout period and crossover to the other strategy for the opposite-side TKA. The overall efficacy of both strategies was evaluated by determination of blood loss, the Knee Society score (KSS), and knee inflammation conditions during a 3-month postoperative period. The postoperative pain, range of motion (ROM), and complications were sequentially evaluated to compare the two groups until 10 years after surgery.@*RESULTS@#At the 10-year follow-up, both groups had a similarly significantly improved ROM (114.88 ± 9.84° vs. 114.02 ± 9.43°, t  = 0.221, P  = 0.815) and pain relief with no differences between the two groups (1.0 [1.0] vs. 1.0 [1.5], U  = 789.500, P  = 0.613). Similar changes in total blood loss, KSS, and knee inflammation were found in both groups during 3 months postoperatively ( P  > 0.05). Additionally, there was no significant difference regarding complications and satisfaction between the two groups ( P  > 0.05).@*CONCLUSIONS@#Synovectomy in conjunction with TKA for primary OA does not seem to provide any benefit regarding postoperative pain, ROM, and satisfaction during a 10-year follow-up. In addition, it may not result in more blood loss and increased incidence of long-term complications. Based on our long-term findings, it should not be performed routinely.@*TRIAL REGISTRATION@#Chinese Clinical Trial Registry, ChiCTR-INR-16008245; https://www.chictr.org.cn/showproj.aspx?proj=13334 .

Coronal curvature of tibial leads to malalignment of tibial prosthesis after total knee arthroplasty / 中国骨伤

OBJECTIVE@#To investigate the effect of tibial coronal curvature on the alignment of tibial prosthesis in patients undergoing total knee arthroplasty (TKA).@*METHODS@#From July 2019 to April 2021, 100 patients with knee osteoarthritis were treated with total knee arthroplasty. Before operation, the full-length films of lower limbs were taken and the tibial bowing angle(TBA) was measured. TBA more than 2° was tibial bending, which was divided into tibial bending group and non bending group. There were 40 cases in tibial bending group, 9 males and 31 females, aged 56 to 84 years old with an average of (69.22±7.10) years. There were 60 cases in the non bending group, 19 males and 41 females, aged from 51 to 87 years old with an average of (70.80±7.21) years. The preoperative tibial length (TL) and medial proximal tibial angle (MPTA) were measured and compared between the two groups. The full-length X-rays of the lower limbs were taken again 3 days to 1 week after operation. The medial angle of the tibial component coronal aligement angle (TCCA) and the outilier rate of force line of the tibial prosthesis were measured and compared between the two groups. Pearson method was used to analyze the correlation between TCCA and age, TCCA and height, TCCA and weight, TCCA and BMI, TCCA and TBA, TCCA and TL, TCCA and MPTA; Spearman method was used to analyze the correlation between TCCA and gender, TCCA and Kellgren-Lawrence(K-L) grade.@*RESULTS@#All 100 patients successfully completed the operation and obtained satisfactory full-length X-rays in standing position. There was no significant difference in TL, MPTA and TCCA between bending group and non bending group(P>0.05). The outilier rate of force line in tibial bending group was 22.5%, and that in non bending group was 6.67%, the difference was statistically significant(P<0.05). The correlation study found that TCCA was strongly correlated with TBA(r=-0.702, P<0.01), weakly correlated with MPTA(r=0.311, P<0.01), and had no correlation with other parameters(P>0.05).@*CONCLUSION@#In patients with knee osteoarthritis undergoing total knee arthroplasty, tibial bending will lead to poor force line of tibial prosthesis. During operation, attention should be paid to osteotomy of proximal tibial vertical tibial mechanical axis and correct installation of prosthesis to avoid poor alignment of prosthesis.

Incidência de infecções em artroplastias de quadril e joelho em pacientes com artrite reumatoide e osteoartrite / Incidence of infectious complications in hip and knee arthroplasties in rheumatoid arthritis and osteoarthritis patients

INTRODUÇÃO: A artrite reumatoide (AR) é uma das principais indicações de artroplastia total do quadril (ATQ) ou joelho (ATJ). Estudos internacionais indicam a AR como fator de risco para infecções de prótese. OBJETIVOS: Comparação entre pacientes com AR e osteoartrite (OA) de outras etiologias em relação à incidência de infecções de prótese, infecções incisionais e outras infecções sistêmicas pós-operatórias em ATQ e ATJ. MÉTODOS: Coorte retrospectiva, comparativa, de pacientes acompanhados após a realização de ATQ ou ATJ no Hospital SARAH-Brasília, no período entre 1996 e 2007. RESULTADOS: Setenta e cinco artroplastias em pacientes com AR foram identificadas, das quais 28 ATJ e 47 ATQ. Como controles, foram selecionadas 131 cirurgias em pacientes com OA, das quais 56 ATJ e 75 ATQ, de maneira aleatória e estratificada pela cirurgia e pelo gênero. Não houve diferenças significativas entre os grupos de AR e OA no que diz respeito às taxas de infecções de prótese (respectivamente, ATJ 7,1% vs. 0% e ATQ 2,1% vs. 0%, ambos com P > 0,1), infecção incisional (ATJ 14,3 vs. 3,3% e ATQ 4,3 vs. 1,3%, ambos com P > 0,1) e infecção sistêmica (ATJ 7,1 vs. 3,6%, P = 0,92 e ATQ 4,3 vs. 10,7%, P > 0,1). Após regressão logística múltipla, não houve alteração dos resultados. CONCLUSÕES: A presença de AR não foi identificada como fator de risco para infecções perioperatórias em ATQ e ATJ em casuística do Hospital SARAH-Brasília, em comparação com o grupo de pacientes com OA primária ou secundária a doenças não inflamatórias. A baixa incidência de infecções em ambos os grupos pode explicar os nossos achados.

INTRODUCTION: Rheumatoid arthritis (RA) is one of the major indications of total hip (THA) or knee (TKA) arthroplasty. International studies have suggested that RA is a risk factor for prosthesis infections. OBJECTIVES: To compare patients with RA and patients with osteoarthritis (OA) of other etiologies with regard to the incidence of prosthesis, incisional, and other systemic postoperative infections in THA and TKA. METHODS: Retrospective, comparative cohort of patients followed up after undergoing THA or TKA at the Hospital SARAH-Brasília, from 1996 to 2007. RESULTS: Seventy-five arthroplasties (28 TKA and 47 THA) were identified in RA patients. As controls, 131 surgeries (56 TKA and 75 THA) in OA patients were randomly selected and stratified by surgery and gender. No significant difference was observed between the RA and OA groups regarding the rates of prosthesis infections (TKA 7.1% vs. 0% and THA 2.1% vs. 0%, respectively, both with P > 0.1), incisional infections (TKA 14.3% vs. 3.3% and THA 4.3 vs. 1.3%, respectively, both with P > 0.1), and systemic infections (TKA 7.1% vs. 3.6%, P = 0.92 and THA 4.3% vs. 10.7%, P > 0.1, respectively). After multiple logistic regression, the results did not change. CONCLUSIONS: RA was not identified as a risk factor for perioperative infections in THA and TKA in this case series of the Hospital SARAH-Brasília, as compared with the group of patients with primary OA or OA secondary to non-inflammatory diseases. The low incidence of infections in both groups may explain our findings.

Restless legs syndrome in subjects with a knee prosthesis: evidence that symptoms are generated in the periphery

OBJECTIVE: There are no data adressing the prevalence of restless legs syndrome in subjects who have knee prosthesis. Therefore, we conducted a cross-sectional survey of subjects who underwent knee prosthesis surgery. METHOD: A total of 107 subjects (30 male, 77 female) were interviewed over the telephone regarding restless legs syndrome symptoms. If the patients exhibited symptoms of the syndrome, we conducted face-to-face interviews. Lastly, a therapeutic test with pramipexole was proposed for each subject. RESULTS: In our cohort, 7 males (23 percent) and 30 females (39 percent) had restless legs syndrome. Of these, 6 males and 23 females were submitted to face-to-face-interview. Of the males, 5 (83 percent) had restless legs after the knee surgeryexclusively in the operated leg- and reported no family restless legs history. One man had a prior case of bilateral restless legs syndrome, a positive family history and claimed exacerbation of symptoms in the operated leg. Among the females, 16 (69 percent) had restless legs prior to surgery. A total of 10 female patients reported bilateral symptoms, with fewer symptoms in the operated leg, while 6 displayed a worse outcome in the operated leg. The 7 females (31 percent) without restless legs prior to surgery and without a family history experienced symptoms only in the operated leg. All subjects responded favorably to the pramipexole therapeutic test. CONCLUSION: Our results suggest that secondary unilateral restless legs syndrome may ensue from knee prosthesis surgery and that the symptoms are generated in the peripheral nervous system.

The Modified Static Spacers Using Antibiotic-Impregnated Cement Rod in Two-Stage Revision for Infected Total Knee Arthroplasty

The two-stage exchange arthroplasty (one- or two-stage) is believed to be the gold standard for the management of infections following total knee arthroplasty. We herein report a novel two-stage exchange arthroplasty technique using an antibiotic-impregnated cement intramedullary nail, which can be easily prepared during surgery using a straight thoracic tube and a Steinmann pin, and may provide additional stability to the knee to maintain normal mechanical axis. In addition, there is less pain between the period of prosthesis removal and subsequent reimplantation. Less soft tissue contracture, less scar adhesion, easy removal of the cement intramedullary nail, and successful infection control are the advantages of this technique.

Avaliação isocinética em pacientes submetidos à artroplastia total de joelho / Isokinetic evaluation of patients submitted to total knee arthroplasty

OBJETIVOS: Tem-se afirmado que a via de acesso minimamente invasiva na artroplastia total de joelho (ATJ) por não agredir o músculo quadríceps femoral permite reabilitação mais precoce. A fim de verificar a influência da preservação do aparelho extensor no ato cirúrgico, avaliou-se a força da musculatura extensora e flexora do joelho em pacientes submetidos à ATJ por duas vias de acesso diferentes. MATERIAIS E MÉTODOS: Este estudo comparou, no período de janeiro de 2005 a julho de 2006, os valores de torque máximo e de trabalho total obtidos por dinamometria isocinética aos seis meses de pós-operatório. Foram avaliados 12 indivíduos submetidos a ATJ por via de acesso minimamente invasiva e 8 indivíduos submetidos a ATJ por via de acesso transquadricipital. RESULTADOS: A análise estatística dos valores de torque máximo e de trabalho total absolutos e corrigidos pelo peso corporal não demonstrou diferença entre os dois grupos. CONCLUSÃO: Não há diferença de força da musculatura extensora e flexora do joelho aos seis meses de cirurgia.

OBJECTIVE: In total knee arthroplasty, the minimally-invasive approach has been claimed to enable earlier rehabilitation because it spares the femoral quadriceps muscle. To check the influence of preserving the extensor apparatus during surgery, the strength of knee extension and flexion muscles was evaluated in patients submitted to total knee arthroplasty with different approaches. MATERIALS AND METHODS: The values of maximum torque and total work obtained by isokinetic dynamometry six months after surgery were compared for the Minimally invasive surgery group constituted of 12 individuals submitted to total knee arthroplasty by the minimally invasive surgical approach and the Control group, constituted of eight patients submitted to total knee arthroplasty by the transquadricipital approach, between January 2005 and July 2006. RESULTS: Statistical analysis of the absolute values for maximum torque and total work adjusted for body weights did not show differences between both groups. CONCLUSION: There was no difference in the extension and flexion strength of the knee muscles six months after surgery.

Comparison of bilateral and unilateral total knee arthroplasty in Iranian hospital, Dubai

There have been many studies in the literature on the advantages and disadvantages of bilateral versus staged or unilateral knee arthroplasty. In this study, the results of bilateral and unilateral total knee arthroplasty cases during the past 3 years were compared. The records of all cases undergoing total knee arthroplasty between March 2005 and February 2008 were studied retrospectively. There have been 62 patients [105 knees] operated, from seven different countries. Among these cases, 43 cases had bilateral TKA, from which 36 patients underwent simultaneous intervention, four patients had staged TKA with one-week gap and three cases were staged with one-year gap between interventions. Except for two cases of postoperative delirium [probably due to transient fat emboli] and three cases of transient renal impairment, there had been no complications in the simultaneous bilateral cases. The need of blood transfusion was significantly higher in simultaneous cases [1.7 unit/patient] compared to unilateral cases [0.6 unit/patient]. There were no major problems with the simultaneous bilateral total knee arthroplasty. In the case of bilateral varus deformity, the postoperative rehabilitation was easier and the patients were more satisfied. Moreover, considering the fact that most of our patients came from various countries, simultaneous total knee replacement effectively reduced the hospitalization costs and related expenses

Periprosthetic fractures of the femur after hip and knee replacement

To present the clinical and radiological results of treatment of periprosthetic fractures of the femur after hip and knee replacements. Thirty-four patients [8 males and 26 females] with 34 fractures of the femur complicating hip and knee replacements are the subjects of this report. In 21 cases, the fracture affected the femur after hip replacement, and in 13 cases after knee replacement. Fractures around the hip replacement were classified according to Vancouver classification, and those around the knee replacement were classified according to Rorabeck. Location of fracture was defined as metaphyseal or diaphyseal. Arbitrary classification of fracture union was used. Fractures were considered to be either united or to have delayed union, after radiology. Conservative treatment and different methods of fixation were used. Clinical correlations between location of fracture and outcome were analyzed. All 21 metaphyseal fractures after hip and knee replacements united. Eight diaphyseal fractures [6 after hip replacement and 2 after knee replacement] united. Five diaphyseal fractures after hip replacement had delayed union, and 4 fractures united after bone graft. In 1 case, fracture did not unite, the treatment was discontinued and the patient was lost to follow-up. Our data show that metaphyseal fractures, regardless of type of implant, had better healing potential and did not require additional surgery. Diaphyseal fractures of the femoral shaft around the stem of femoral component of the hip or knee prosthesis required a bone graft and had less favorable outcomes. Women were more frequently affected by periprosthetic femoral fractures

Fracture of a Polyethylene Tibial Post in a Scorpio Posterior-Stabilized Knee Prosthesis

We report the case of a polyethylene tibial post fracture in a 72-year-old woman 14 months after a Scorpio posterior-stabilized (PS) total knee arthroplasty. The polyethylene wear was found around the fracture site of the post, especially over the anterior aspect of the post base. The failure mechanism of the post fracture in the present case was anterior impingement with excessive wear over the base of the anterior aspect of the tibial post, which became a stress-riser of post and cam articulation. This is the first report of a polyethylene tibial post fracture of a Scorpio PS prosthesis.

Evaluación del componente patelar en artroplastía total de rodilla / Evaluation of patellar resurfacing in total knee arhtroplasty

Ever since the first Total Knee Arthroplasty was made to our present times, a point that still generates controversy is, if the accomplishment of patellar resurfacing will take to a higher global rate of complications. It was the final objective of our work to analyze clinically and radiologically, in addition to satisfaction degree and quality of life surveys, the patellar resurfacing in a sample of total knee arthroplasty made in our center. We can conclude that in our experience, the patellar resurfacing has a low incidence of complications, which do not affect in a significant way the quality of life of the patients carrying on a total knee arthroplasty, which justifies this procedure absolutely.

Desde que se realizan las Artroplastías Totales de Rodilla hasta la fecha, un punto que genera controversia, es, si la realización de un componente protésico patelar llevará a una mayor tasa global de complicaciones. Es por eso que el objetivo de nuestro trabajo fue analizar clínica y radiológicamente, además de encuestas del grado de satisfacción, el componente de recubrimiento patelar en una muestra de las artroplastías totales de rodilla realizadas en nuestro centro. Se concluye que en nuestra experiencia, el uso de recubrimiento patelar tiene una baja incidencia de complicaciones, las cuales no afectan de manera significativa la calidad de vida de los pacientes con artroplastía total de rodilla, lo que justifica plenamente su utilización.

Intra-synovial Ropivacaine and Morphine for Pain Relief after Total Knee Arthroplasty -A Prospective, Randomized, Double Blind Study-

PURPOSE: Several analgesic techniques are available for pain management after a major operation. MATERIALS AND METHODS: From December 2005 to February 2006, a prospective, double-blind study was performed involving 90 patients who had undergone a total knee arthroplasty. Patients were randomly divided into three equal groups (n=30). Demographic data, including age, height, weight, knee score, visual analogue scale (VAS), and range of flexion were evaluated preoperatively. Before wound closure, patients were given intra-synovial injections of the following solutions: patients in group I received 40mL of 300mg ropivacaine with 1:200,000 epinephrine and 5mg morphine; patients in Group II received 40mL of 300mg ropivacaine with epinephrine; and patients in Group III received 50mL normal saline as a control. All patients received an epidural patient-controlled analgesia (PCA) for 24 postoperative hours. Analgesic efficacy was evaluated using the VAS at intervals of 2, 4, 6, 12, 24, 32, 40, and 48 hours postoperatively. During this period, the side effects, the dosage of rescue analgesia required, and the range of knee flexion were recorded for each group. RESULTS: There were no significant differences among the three groups with regards to the VAS and the required dose of rescue analgesia (p > 0.05). None of the groups demonstrated significant differences in the range of knee flexion and the incidence of postoperative nausea and emesis (p > 0.05). CONCLUSION: Therefore, we found that ropivacaine, alone or with morphine, injected into the synovial tissue, along with an epidural PCA has no additional benefits in pain control after a total knee arthroplasty.

Complicaciones paterales en la artroplastia total de rodilla: un estudio de metanálisis / Patellar complications in total knee arthroplasty: a meta-analysis study

Con el propósito de estimar las verdaderas diferencias entre diversos autores respecto a los porcentajes de complicaciones patelares (con o sin prótesis patelar) en la artroplastia total de rodilla (ATR), se realizó un estudio de metanálisis midiendo los tamaños del efecto (ES), las tasas de reducción del riesgo y el número de pacientes a tratar (NNT). En general, se demuestra que los estudios con muestras pequeñas introducen errores aletorios elevados y, estrictamente, no deberían ser considerados para estimar los tamaños del efecto al comparar los grupos tratados (ATR con prótesis patelar) contra los controles (ATR sin prótesis patelar). Se concluye que, al hacer las comparaciones correctas, los porcentajes de complicaciones son significativamente menores en la ATR con prótesis patelar y que las diferencias en los porcentajes de complicaciones, reportadas a partir de estudios con casuística relativamente grande, entre estos autores, son producto de los diferentes grados de dominio de las técnicas quirúrgicas empleadas. Se finaliza recomendando el uso de los estudios de metanálisis en ortopedia

Subluxación posterior por desgaste del polietileno en la artroplastía total de la rodilla / Posterior subluxación because of polyethylene wastening in total knee arthroplasty

La subluxación progresiva del fémur en las artroplastías totales de rodilla y el aflojamiento de los componentes de la prótesis así como del desgaste del polietileno son problemas de difícil solución que se asocian con sinovitis y oteólisis. El análisis de las causas de este problema es motivo del presente trabajo, donde se observó que entre los factores que influyen el desgaste del polietileno se encuentran su calidad, porque el calor y la presión que se usa para alisar su superficie por medio de rayos gamma deslamina este material, su grosor que sólo se aconseja se a menor cuando se conserva el ligamento cruzado posterior y la geometría articular que determina la congruencia de las estructuras de la prótesis ocasionando cargas extra al polietileno cuando existe congruencia. No existe una técnica que evite este tipo de problemas pero se vio que al conservar el ligamento cruzado posterior disminuía el desgaste

Tratamento em dois tempos das infecçöes nas artroplastias totais do joelho / Two-stage technique to treat infected total knee arthroplasties

Os autores apresentam a técnica de tratamento em dois tempos para as artroplastias totais de joelho infectadas e os resultados a curto prazo. Foram protocolados seis pacientes (seis joelhos) que apresentavam infecção profunda pós-artroplastia total. No primeiro tempo é feita a resecção da artroplastia primária com desbridamento e colocação de espaçador de cimento com gentamicina, permanecendo seis semanas com antibioticoterapia endovenosa. No segundo tempo é feita a artroplastia total de revisão. Apesar do curto tempo de seguimento, os resultados têm sido promissores, não havendo recidiva da infecção em nenhumcaso.

Complicaciones en la artroplastía total de rodilla / Complications in the total arthroplasty of the knee

La artroplastía total de rodilla (ATR) es el tratamiento de elección para la artrosis severa, la cual se maniefiesta con dolor importante e incpacidad funcional, al realizar este tratamiento se debe estar seguro de que es el indicado y conciente de las complicaciones que se pueden presentar. Se revisaron los expedientes de pacientes operados de artroplastía total de rodilla en el servicio de cirugía articular del Instituto Nacional de Ortopedia, analizando las complicaciones presentadas y el tramite con el que se resolvieron éstas. Se revisaron un total de 151 expedientes en donde sumaron 187 prótesis totales de rodilla colocadas en el periodo comprendido de enero de 1990 a diciembre de 1995 con un seguimiento mínimo de 2 meses y máximo de 5 años, encontrando 34 complicaciones entre aflojamiento, infecciones, artrofibrosis, afecciones patelares, fracturas, hematoma, trombofleblitis y ruptura de ligamento cruzado anterior, resolviéndolas con tratamientos que fueron desde la artroscopía hasta la artrodesis. Las complicaciones de la artroplastía total de rodilla independientemente del modelo de que se trate, se presentan con cierta frecuencia en centros hospitalarios en donde se colocan periódicamante, por lo que se deben identificar las causas de éstas para evitarlas y en caso de que se presenten saber cómo resolverlas. Las complicaciones de la ART en esta serie son del 18.8 por ciento, porcentaje ligeramente por encima de las reportadas en la literatura mundial; las causas más frecuentes de complicación con la mala indicación de la cirugía y las fallas en la técnica quirúrgica, por lo que se debe capacitar bien al ortopedista que tenga contacto con este tipo de procedimiento

Tratamento das complicaçöes de endopróteses näo convencionais utilizadas em tumores ósseos / Treatment of the complications of the custom-made prosthesis in the treatment of bone tumors

Os autores apresentam os resultados das complicaçoes de 79 endopróteses nao convencionais realizadas em 75 pacientes para o tratamento de tumores ósseos e de lesoes pseudotumorais que acometeram o ombro, o quadril e o joelho. Entre as complicaçoes mais freqüentes, encontraram a recidiva local em oito (10,13 por cento) pacientes, a luxaçao em seis (7,59 por cento), a infecçao em cinco (6,33 por cento) e a liberaçao de partículas em cinco (6, 33 por cento), entre outras. Na avaliaçao final, 22 (29,33 por cento) pacientes estavam livres de doença e três (4,00 por cento) sem evidência dela, enquanto 11 (14, 67 por cento) estavam vivos com doença em atividade e 36 (48 por cento) evoluíram para óbito devido à doença. Na avaliaçao final, encontraram 29,11 por cento de resultados excelentes, 36,71 por cento de bons, 25,32 por cento de regulares e 8,86 por cento de maus. Concluem que as endopróteses nao convencionais utilizadas foram, a despeito das complicaçoes, método satisfatório no tratamento dos tumores ósseos em 52 (65,82 por cento) entre as 79 cirurgias realizadas.

Late infection following total knee arthroplasty

During one year between August 1991 and July 1992, nine patients with nine infected total knee replacements were treated by a two-stage reimplantation with a six-weeks course of antibiotics. Average age at the time of index arthroplasty was 67 years. The primary diagnosis was rheumatoid arthritis in 4, osteoarthritis in 3 and post- traumatic arthritis in 2. The diagnosis of infection was established preoperatively by culture of a specimen obtained on aspiration in six knees, and by isotope bone scan in three. The period between the index arthroplasty and the onset of infection ranged from 5 to 36 months, average 11.6. The two-stage procedure included removal of all the components of the prosthesis and all cement, then six weeks of antibiotics and finally reimplantation with a total knee prosthesis. The follow up period ranged from 6-15 months, average 11 months. The final results were excellent in two cases, good in six and fair in one Limitation of flexion, weakness of quadriceps muscle and extension lag were the major problems encountered following reimplantation

Artroplastia total do joelho: análise de 30 operaçöes / Total knee arthroplasty: analysis of 30 surgeries

Foram avaliados 24 pacientes submetidos a 30 artroplastias totais do joelho, utilizando-se a prótese de Freeman-Samuelson. O tempo de evoluçäo pós-operatória foi de 21 meses, em média. Houve alívio da dor em 90 por cento dos pacients; 82 por cento apresentavam mobilidade articular acima de 90 graus; apenas 50 por cento podiam deambular por 30 minutos ou mais, mas outras causas de limitaçäo da marcha estavam presentes. As deformidades de alinhamento do membro inferior foram corrigidas em todos os pacientes e näo houve caso de instabilidades após a operaçäo. Analisando-se os resultados com relaçäo ao lado, sexo, diagnóstico etiológico, idade e fixaçäo com ou sem cimento, näo foram encontradas diferenças significativas entre os grupos. Ocorreram duas complicaçöes que necessitaram remoçäo da prótese: uma soltura asséptica, que foi revisada para nova artroplasia, e uma infecçäo profunda, convertida com sucesso em artrodese. Os resultados obtidos foram comparáveis aos descritos na literatura. Há necessidade de acompanhamento perpétuo dos pacientes, já que novas complicaçöes devem surgir com o ocorrer do tempo