Resuperficialización de la rótula en el reemplazo primario total de rodilla: estudio comparativo a dos años de seguimiento / Patellar resurfacing in primary total knee replacement: A comparative study at two years of follow-up

Objetivo: Comparar los resultados funcionales del reemplazo total de rodilla con resuperficialización de rótula o sin resuperficialización, a los dos años de seguimiento. materiales y métodos: Estudio observacional retrospectivo de grupos comparativos de pacientes con osteoartritis sometidos a un reemplazo total de rodilla primario con resuperficialización de rótula o sin este procedimiento, entre enero de 2014 y diciembre de 2016, en dos centros de Colombia. A todos se les colocó una prótesis cementada Optetrak®. La función se evaluó antes de la cirugía y a los dos años mediante las escalas Knee Society Score (KSS), Hospital for Special Surgery (HSS) y Oxford Knee Score (OKS). Resultados:Se incluyeron 206 reemplazos totales de rodilla: 94 (grupo con resuperficialización) y 112 (grupo sin resuperficialización). La media de la edad en la cohorte de estudio era de 66.9 ± 9.7 años y el 76,7% (n = 155) eran mujeres. El tiempo quirúrgico fue más prolongado en el grupo con resuperficialización (mediana 100 min, RIC 90-110) que en el otro grupo (mediana 85 min, RIC 70-90; p <0,001). Aunque se observó una mejoría funcional antes del reemplazo total de rodilla y después, en ambos grupos, el cambio en el KSS clínico, el KSS funcional y el OKS fue mejor en el grupo con resuperficialización (p <0,05). Conclusiones: La resuperficialización de rótula durante el reemplazo total de rodilla se asoció a mejores resultados funcionales a los dos años. No obstante, los pacientes sin resuperficialización también refirieron una mejoría funcional después del reemplazo total de rodilla. Nivel de Evidencia: III

Objective: To compare the functional outcomes of total knee replacement (TKR) with and without patellar resurfacing at two years of follow-up. materials and methods: We carried out a retrospective observational study of patients with osteoarthritis who had undergone TKR with or without patellar resurfacing between January 2014 and December 2016 in two hospitals in Colombia. All patients received a cemented Exactech Optetrak prosthesis. Function was evaluated before surgery and after two years of follow-up with the Knee Society Score (KSS), Hospital for Special Surgery (HSS) and Oxford Knee Score (OKS). Results: A total of 206 TKRs were included, 94 in the group with resurfacing and 112 in the group without resurfacing. The mean age was 66.9 ± 9.7 years and 76.7% (n = 155) were female. Surgical time was longer in the group with resurfacing with a median of 100 minutes (Interquartile range-IQR: 90-110) compared to 85 minutes in the group without resurfacing (IQR: 70-90), p <0.001). Although functional improvement was observed before and after TKR in both groups, the change in clinical KSS, functional KSS, and OKS scores before and after TKR was better in the resurfacing group (p <0.05). Conclusion: Patellar resurfacing during TKR was associated with better functional outcomes at two years of follow-up. However, patients without resurfacing also reported functional improvement after TKR. Level of Evidence: III

Postoperative Failure Frequency of Short External Rotator and Posterior Capsule With Successful Reinsertion After Primary Total Hip Arthroplasty: An Ultrasound Assessment.

BACKGROUND: The reinsertion of the short external rotators and posterior capsule to the greater trochanter in the posterolateral approach has been considered an effective strategy to reduce the risk of dislocation. However, during clinical practice, no verification and monitoring of the status of such reinsertions is carried out. The objective of this study is to estimate the frequency of postoperative failure with successful reinsertion of the short external rotator and posterior capsule of the hip through ultrasound after primary total hip arthroplasty (THA) using the posterolateral approach. METHODS: A prospective observational study was conducted involving patients with primary total hip arthroplasty via posterolateral approach in which reinsertion of hip's short external rotators and posterior capsule were successful reinserted during surgery from January to December 2019. The status of the reinsertion was assessed with an ultrasound between the 6 and 8 weeks after surgery. Reinsertion failure was considered when the reinserted structures were not fully visualized in the ultrasound during internal and external rotation. RESULTS: Sixty-eight patients were included in this study (mean age: 58.7 ± 13.8 years; 44.1% (30) women). The incidence of failure of the reinsertion of short external rotators and posterior capsule was 16.2% (n = 11) (95% confidence interval 9.3-26.7). A postoperative increased femoral offset was found more frequently in cases with failure (36.4% vs 17.5%); a similar trend was observed in the leg length discrepancy (36.4% vs 22.8%). However, these differences were not statistically significant (P > .05). CONCLUSION: Between the 6th and 8th postoperative week, approximately 2 of the 10 short external rotator and posterior capsule reinsertions fail in cases with successful intraoperative repair using absorbable suture. This estimate is comparable and even lower than previous reports. EVIDENCE LEVEL: II, Prospective Observational Study.

Resultados funcionales de hemiartroplastía bipolar en pacientes mayores de 65 años con fracturas intracapsulares de cadera / Functional results of bipolar hemiarthroplasty in patients over 65 years of age with intracapsular hip fractures

Resumen: Introducción: La hemiartroplastía bipolar (HA) es una alternativa para el tratamiento de las fracturas desplazadas de cuello femoral en pacientes de edad avanzada con baja demanda funcional y comorbilidades asociadas. El objetivo fue describir la funcionalidad en pacientes mayores de 65 años con fracturas intracapsulares de cadera tratados con HA. Material y métodos: Revisión retrospectiva de pacientes mayores de 65 años entre Enero de 2012 y Mayo de 2017. Se evaluó con la escala de Harris (HHS) y Oxford a los seis meses y al año posterior a la cirugía. Se documentaron las complicaciones y la mortalidad durante el primer año postquirúrgico. Resultados: 48 casos (12 hombres; 36 mujeres), edad promedio de 80.8 ± 7.7 años. Comorbilidades más frecuentes: hipertensión arterial (77.1%), osteoporosis (37.5%), diabetes (33.3%) e hipotiroidismo (29.2%). El porcentaje de complicaciones postoperatorias asociadas fue de 8.3% (cuatro casos). La mediana del HHS a los seis y 12 meses fue de: 90.5 (DE: 77.5-96.0) y 96 (DE: 92-98), respectivamente. La escala de Oxford fue de 45.5 (DE: 38.5-48.0) a los seis meses y de 47.0 (DE: 43.5-48) al año postoperatorio. El 4.2% (dos casos) fallecieron durante el primer año postquirúrgico y ninguno estuvo asociado al procedimiento. Discusión: La HA ofrece buenos resultados funcionales en pacientes mayores de 65 años, con una tasa baja de complicaciones. En nuestra serie y en el corto plazo no se observó mortalidad asociada al procedimiento quirúrgico.

Abstract: Introduction: Bipolar hemiarthroplasty is an alternative for the treatment of displaced femoral neck fractures in elderly patients with low functional demand and associated comorbidities. The goal was to describe functionality in patients over 65 years of age with intracapsular fractures of the hip. Material and methods: Retrospective review of patients over 65 years of age between January 2012 and May 2017. It was evaluated with the Harris Hip Score (HHS) and Oxford scale at six months and the year after surgery. Complications and mortality were documented during the first post-surgical year. Results: 48 cases (12 men; 36 women), average age of 80.8 ± 7.7 years. Most common diseases: high blood pressure (77.1%), osteoporosis (37.5%), diabetes (33.3%) hypothyroidism (29.2%). The percentage of associated postoperative complications was 8.3% (four cases). The median HHS at six and 12 months was: 90.5 (DE: 77.5-96.0) and 96 (DE: 92-98), respectively. The Oxford scale was 45.5 (DE: 38.5-48.0) at six months and 47.0 (DE: 43.5-48.0) per postoperative year. 4.2% (two cases) died during the first post-surgical year and none were associated with the procedure. Discussion: HA provides good functional outcomes in patients over 65 years of age, with a low rate of complications. No mortality associated with the surgical procedure was observed in our series and in the short term.

Relationship between Body Mass Index and Complications during the First 45 Days after Primary Total Hip and Knee Replacement: A Single-Center Study from South America.

BACKGROUND: The goal of this study was to evaluate the relationship between body mass index (BMI) and early complications of total hip replacement (THR) and total knee replacement (TKR). METHODS: This is a retrospective study of patients who underwent primary THR and TKR between January 2011 and December 2015. We included patients between 18 and 90 years of age with BMI less than 40 kg/m2 with a minimal postoperative follow-up time of 45 days. The primary outcomes were the presence of infection, mechanical complications (dislocation, fractures, arthrofibrosis, or neuropraxia), and thromboembolic events. Overweight and obesity were defined as a BMI of 25-29.9 kg/m2 and ≥ 30 kg/m2, respectively. RESULTS: In total 750 patients were included (THR, 268; TKR, 482) with a mean age of 65.0 ± 12.4 years. The percentage of patients with normal weight, overweight, and obesity was 24.9% (n = 187), 41.7% (n = 313), and 33.4% (n = 250), respectively. The early complication rate was 8.9% (95% confidence interval [CI], 7.1% to 11.2%). Infection and mechanical complications were most prevalent. There was no statistically significant relationship between the incidence of complications and BMI (obesity vs. normal weight: hazard ratio [HR], 1.49; 95% CI, 0.72 to 3.06; p = 0.282); however, there was a tendency toward a greater risk of infectious complications in the patients with obesity (HR, 6.08; 95% CI, 0.75 to 49.16; p = 0.090). Patients with diabetes mellitus (DM) had more risk of infectious complications than those without DM (HR, 2.60; 95% CI, 1.00 to 6.79). CONCLUSIONS: There was no statistical relationship between BMI and early complications of THR and TKR. Nonetheless, there was a tendency toward a higher risk of infection in patients with some degree of obesity.