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PURPOSE: The knee stiffness acquired following an Anterior Cruciate Ligament (ACL) injury might affect clinical knee tests, i.e., the pivot-shift maneuver. In contrast, the motor effects of spinal anesthesia could favor the identification of rotatory knee deficiencies prior to ACL reconstruction. Hence, we hypothesized that the intra-operative pivot-shift maneuver under spinal anesthesia generates more acceleration in the lateral tibial plateau of patients with an injured ACL than without. METHODS: Seventy patients with unilateral and acute ACL rupture (62 men and 8 women, IKDC of 55.1 ± 13.8 pts) were assessed using the pivot-shift maneuver before and after receiving spinal anesthesia. A triaxial accelerometer was attached to the skin between Gerdys' tubercle and the anterior tuberosity to measure the subluxation and reduction phases. Mixed ANOVA and multiple comparisons were performed considering the anesthesia and leg as factors (alpha = 5%). RESULTS: We found a higher acceleration in the injured leg measured under anesthesia compared to without anesthesia (5.12 ± 1.56 m.s- 2 vs. 2.73 ± 1.19 m.s- 2, p < 0.001), and compared to the non-injured leg (5.12 ± 1.56 m.s- 2 vs. 3.45 ± 1.35 m.s- 2, p < 0.001). There was a presence of significant interaction between leg and anesthesia conditions (p < 0.001). CONCLUSIONS: The pivot-shift maneuver performed under anesthesia identifies better rotatory instability than without anesthesia because testing the pivot-shift without anesthesia underestimates the rotatory subluxation of the knee by an increased knee stiffness. Thus, testing under anesthesia provides a unique opportunity to determine the rotational instability prior to ACL reconstruction.

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The aim of this study was to investigate whether 12 weeks of leg press strength training exercise could affect the conventional and functional hamstring:quadriceps ratios in the elderly. Twelve elderly participants were submitted to a 12 week progressive training protocol (two sessions/week) using a 45° leg press exercise. A significant increase in the one repetition maximum was observed after 4, 8, and 12 weeks (p = 0.001, p < 0.001, and p < 0.001, respectively) compared to week 0 and after 8 (p = 0.011) and 12 weeks (p = 0.001) compared to week 4. The concentric knee extensor peak torque was significantly higher at weeks 8 (p = 0.001) and 12 (p = 0.024) compared to week 0. There was no change in the concentric and eccentric knee flexor peak torques (p = 0.629 and 0.274, respectively) and conventional ratio (p > 0.314) after 12 weeks of training. The functional ratio (eccentric knee flexor peak torque:concentric knee extensor peak torque) reduced significantly after 8 (p = 0.034) and 12 (p = 0.036) weeks of strength training. Although the 45° leg press exercise requires knee extensor and flexor, hip extensor, and plantar flexor muscle strength, our findings suggest that the isolated use of the 45° leg press exercise reduces the knee functional ratio after 8 weeks of training. Therefore, 45° leg press exercise alone, without a hamstring exercise, should not be recommended for elderly individuals.

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ABSTRACT BACKGROUND AND OBJECTIVES: Knee stability is critical for the execution of functional tasks, maintaining the joint within physiologic limits and preventing possible mechanical loads. A type of taping being increasingly used in recent years is Kinesio Taping, which is often used as resource to improve joint stability and decrease pain. This study aimed at evaluating the acute effect of Kinesio Taping on stability and pain in a patient with chronic knee instability. CASE REPORT: Male patient, 46 years old, with chronic knee instability due to late postoperative period of Anterior Cruciate Ligament injury, was evaluated during two functional activities (up/ down a stair and squat), before and immediately after Kinesio Taping. Evaluation tools were visual analog scale and videometry to evaluate knee varus angle peak during functional activities. There has been significant decrease (p<0.001) in mean knee varus angle peak during functional activities up/ down a stair (Pro-Kinesio: 189.4; Post-Kinesio: 186.2) and squat (Pre-Kinesio: 198.2; Post-Kinesio: 189.6). There has also been decrease in the visual analog scale for up/down a stair (Pre-Kinesio: 4; Post-Kinesio: 0) and squat (Pre-Kinesio: 3; Post-Kinesio: 0). CONCLUSION: Our results suggest that Kinesio Taping was effective to improve knee dynamic stability and decrease pain during functional activities of going up/down a stair and squat.

RESUMO JUSTIFICATIVA E OBJETIVOS: A estabilidade do joelho é fundamental para a execução de tarefas funcionais, mantendo a articulação dentro dos limites fisiológicos e evitando possíveis sobrecargas mecânicas. Um tipo de bandagem que vem ganhando destaque nos últimos anos é a Kinesio Taping, que é frequentemente usada como um recurso para melhorar a estabilidade articular e diminuir o quadro álgico. O objetivo deste estudo foi avaliar o efeito agudo do uso da Kinesio Taping na estabilidade e dor em paciente com instabilidade crônica de joelho. RELATO DO CASO: Paciente do sexo masculino, 46 anos, com instabilidade crônica de joelho, decorrente de pós-operatório tardio de lesão do ligamento cruzado anterior foi avaliado durante duas atividades funcionais (subida/descida no degrau e agachamento), antes e imediatamente após a Kinesio Taping. Os instrumentos de avaliação usados foram a escala analógica visual e a videometria para análise de pico do ângulo varo do joelho durante as atividades funcionais. Observou-se diminuição significativa (p<0,001) da média do pico de ângulo varo do joelho durante as atividades funcionais, subida/descida no degrau (Pré-Kinesio: 189,4; Pós-Kinesio: 186,2), e agachamento (Pré-Kinesio: 198,2; Pós-Kinesio: 189,6). Também houve diminuição da escala analógica visual, subida/descida no degrau (Pré-Kinesio: 4; Pós-Kinesio: 0) e agachamento (Pré-Kinesio: 3; Pós-Kinesio: 0). CONCLUSÃO: Os resultados do presente trabalho sugerem que a Kinesio Taping se mostrou eficaz na melhora da estabilidade dinâmica do joelho e diminuição da dor durante as atividades funcionais de subida/descida no degrau e agachamento.

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Introducción: El objetivo de este estudio retrospectivo fue observar el comportamiento de un tallo modular de fijación proximal y anclaje distal en revisiones de cadera con defectos femorales II y IIIA (Paprosky), evaluando la estabilidad protésica y articular, la restauración del offset y la diferencia de longitud. Materiales y Métodos: Se analizaron 22 revisiones de reemplazos totales de cadera. Doce mujeres y 10 hombres (edad promedio 62.38 años). El seguimiento promedio fue de 62 meses. El tallo femoral utilizado fue S-ROM® (Depuy, Johnson & Johnson). Los defectos óseos femorales fueron 15 de tipo II y 7 de tipo IIIA de Paprosky. Para la evaluación clínica se utilizó el puntaje de cadera de Harris. En las radiografías, se analizó el comportamiento del tallo, su integración, la diferencia de longitud y el offset femoral, y se consideró correcta una diferencia <5 mm. Resultados: El offset fue restaurado en 16 (72,3%) casos y la longitud de miembros se restauró en 15 (68,2%). Hubo un solo hundimiento del tallo, y de acuerdo con la clasificación de Engh, se observaron 17 (77,27%) uniones óseas. Se produjeron siete (31,8%) complicaciones, dos luxaciones que requirieron revisión, cuatro fracturas intraoperatorias y una paresia de ciático poplíteo externo. Conclusiones: Este tallo impresiona ser una alternativa válida para resolver un problema complejo. Por su versatilidad, permite resolver mecánicamente el defecto óseo, devuelve la longitud al miembro y el offset a la articulación, con un índice de complicaciones aceptables.

Background: The purpose of this retrospective analysis was to observe the outcomes of a modular hip system in revision total hip arthroplasty with Paprosky types II and IIIA femoral bone defects, evaluating their performance, offset restoration and leg length discrepancy correction. Methods: Twenty-two revision total hip arthroplasties were analyzed in 12 women and 10 men (average age 62.38 years). The average follow-up was 62 months. Femoral stems S-ROM® (Depuy, Johnson & Johnson) were used. Paprosky femoral bone deficit were 15 types II and 7 IIIA. Clinical evaluation was performed using the Harris Hip Score, while Engh lassification was used for stem fixation. Offset restoration, leg length discrepancy (a difference <5 mm was considered correct) and hip stability were evaluated radiographically. Results: Offset was properly restored in 16 (72.3%) cases and the leg length was matched in 15 (68.2%). There was a single stem subsidence and according to Engh classification, proximal bone ingrowth fixation was obtained in 17 (77.27%) patients. There were 7 (31.8%) complications: two dislocations that required revision, four intraoperative fractures and a lateral popliteal nerve paresis. Conclusions: S-ROM® modular system seems to be a valid alternative to solve a complex problem. Its versatility allows to optimize hip stability, leg length equalization and offset restoration in revision total hip arthroplasty, showing an acceptable complication rate.

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OBJECTIVES: This study evaluated the influence of prosthetic screw material on joint stability in implantsupported dentures at two levels of fit. METHODS: Ten mandibular implant-supported dentures were fabricated. Twenty cast models were fabricated using these dentures. Four groups (n=10) were tested, according to the vertical fit of the dentures [passive and non-passive] and prosthetic screw materials [titanium (Ti) or gold (Au) alloy]. The one-screw test was performed to quantify the vertical misfits using an optic microscope. The loosening torque for the prosthetic screws was measured 24 hours after the tightening torque (10 Ncm) using a digital torque meter. Data were analyzed by two-way ANOVA and Tukey's test (alpha=0.05). RESULTS: Overall, dentures with passive fit and Ti screws resulted in significantly higher loosening torque of the prosthetic screws (p<0.05). No significant interaction was found between fit level and screw material (p=0.199). The prosthetic screw material and fit of implant-supported dentures have an influence on screw joint stability. Ti screws presented higher joint stability than Au screws and minimum of misfit should be found clinically to improve the mechanical behavior of the screw joint.