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Browsing by Author "Sevivas, N"

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  • Assessment of rotatory laxity in anterior cruciate ligament-deficient knees using magnetic resonance imaging with Porto-knee testing device.
    Publication . Espregueira-Mendes, J; Pereira, H; Sevivas, N; Passos, C; Vasconcelos, JC; Monteiro, A; Oliveira, JM; Reis, RL
    PURPOSE: Objective evaluation of both antero-posterior translation and rotatory laxity of the knee remains a target to be accomplished. This is true for both preoperative planning and postoperative assessment of different ACL reconstruction emerging techniques. The ideal measurement tool should be simple, accurate and reproducible, while enabling to assess both ‘‘anatomy’’ and ‘‘function’’ during the same examination. The purpose of this study is to evaluate the clinical effectiveness of a new in-house developed testing device, the so-called Porto-knee testing device (PKTD). The PKTD is aimed to be used on the evaluation of both antero-posterior and rotatory laxity of the knee during MRI exams. METHODS: Between 2008 and 2010, 33 patients with ACLdeficient knees were enrolled for the purpose of this study. All patients were evaluated in the office and under anesthesia with Lachman test, lateral pivot-shift test and anterior drawer test. All cases were studied preoperatively with KT-1000 and MRI with PKTD, and examinations performed by independent observers blinded for clinical evaluation. During MRI, we have used a PKTD that applies antero-posterior translation and permits free tibial rotation through a standardized pressure (46.7 kPa) in the proximal posterior region of the leg. Measurements were taken for both knees and comparing side-to-side. Five patients with partial ruptures were excluded from the group of 33. RESULTS: For the 28 remaining patients, 3 women and 25 men, with mean age of 33.4 ± 9.4 years, 13 left and 15 right knees were tested. No significant correlation was noticed for Lachman test and PKTD results (n.s.). Pivot-shift had a strong positive correlation with the difference in anterior translation registered in lateral and medial tibia plateaus of injured knees (cor. coefficient = 0.80; p\0.05), and with the difference in this parameter as compared to side-to-side (cor. coefficient = 0.83; p\0.05). Considering the KT-1000 difference between injured and healthy knees, a very strong positive correlation was found for side-to-side difference in medial (cor. coefficient = 0.73; p\0.05) and lateral (cor. coefficient = 0.5; p\0.05) tibial plateau displacement using PKTD. CONCLUSION: The PKTD proved to be a reliable tool in assessment of antero-posterior translation (comparing with KT-1000) and rotatory laxity (compared with lateral pivotshift under anesthesia) of the ACL-deficient knee during MRI examination.
    2012Journal article Open access Show more
  • Giant knee “ganglion”—a case report
    Publication . Ferreira, NV; Carriço, FL; Pereira, B; Duarte, R; Maia, R; Sevivas, N; Fidalgo, R; Vieira da Silva, M
    2013Journal article Open access Show more
  • Modified Elmslie-Trillat Procedure for Distal Realignment of Patella Tendon
    Publication . Filho, RB; Monteiro, AM; Andrade, R; Michael, MJ; Sevivas, N; Pereira, B; Sarmento, A; Espregueira-Mendes, J
    Patellofemoral dysfunction, due to either a patellofemoral malalignment or patellar instability, is a complex and debilitating condition that significantly decreases the knee function. Conservative management may yield significant clinical outcomes; however, when morphologic anomalies are identified, the surgical approach should be employed. Hence, several surgical procedures have been described in the scientific literature aiming the correction of underlying extensor mechanism malalignments. Still, the rate of complications is higher than desirable. The described technique is based on the principles of transferring the tibial tubercle medially as described in the Elmslie-Trillat technique. However, a curvilinear horizontal cut is made prior to the vertical cut, which raises a thick osseous fragment and allows the formation of a gutter when the osseous fragment is moved medially. Whereas the horizontal gutter provides stability to the bone fragment, the thicker dimension of the osseous fragment and retention of the distal attachment significantly enhances the osteotomy union. Hence, adequate pain relief and stability with very low postoperative morbidity could be achieved. The purpose of this surgical note is to describe a modification to the Elmslie-Trillat technique to treat patellofemoral dysfunctions, achieving a higher osseous stability and decreased postoperative morbidity.
    2017-12Journal article Open access Show more
  • Neuropatia compressiva do nervo supraescapular
    Publication . Vieira-Ferreira, N; Sevivas, N; Vieira da Silva, M
    Introdução: a neuropatia compressiva do nervo supraescapular foi descrita pela primeira vez em 1952 mas só recentemente tem sido mais compreendida e diagnosticada. A sua etiologia nem sempre é clara e o seu diagnóstico ainda não está bem estabelecido. O tratamento é controverso, especialmente a opção pela libertação artroscópica. Esta técnica tem sido cada vez mais utilizada mas, apesar dos bons resultados relatados, não encontramos na literatura qualquer análise sistematizada dos resultados clínicos desta técnica. Pretendeu-se com este trabalho efetuar uma revisão teórica do tema e uma análise detalhada dos resultados do tratamento artroscópico, procurando as indicações mais apropriadas para esta técnica. Material e Métodos: pesquisa efetuada em 6 bases de dados disponíveis na Internet utilizando as expressões: “suprascapular nerve”, “arthroscopic”, “release” e “decompression”. Efetuada revisão sistemática da literatura encontrada e uma síntese narrativa. Síntese de dados e conclusão. A neuropatia compressiva do nervo supraescapular é atualmente uma entidade nosológica bem estabelecida e cada vez melhor compreendida. Integra o diagnóstico diferencial da patologia da cintura escapular, sobretudo em doentes jovens, atletas ou no contexto de roturas da coifa. O tratamento cirúrgico está indicado na falência do tratamento conservador sendo a libertação artroscópica do nervo uma técnica em expansão. Está indicada em doentes com omalgia posterior, diminuição da força do supraespinhoso e infraespinhoso ou apenas do infraespinhoso, com ou sem alterações electromiográficas. O resultado das pequenas series publicadas até ao momento é encorajador pois parece proporcionar resultados clínicos positivos consistentes, constituindo um tratamento válido para a neuropatia compressiva do nervo supraescapular
    2014Journal article Open access Show more
  • Osteochondral transplantation using autografts from the upper tibio-fibular joint for the treatment of knee cartilage lesions
    Publication . Espregueira-Mendes, J; Pereira, H; Sevivas, N; Varanda, P; Vieira da Silva, M; Monteiro, A; Oliveira, JM; Reis, RL
    PURPOSE: Treatment of large cartilage lesions of the knee in weight-bearing areas is still a controversy and challenging topic. Autologous osteochondral mosaicplasty has proven to be a valid option for treatment but donor site morbidity with most frequently used autografts remains a source of concern. This study aims to assess clinical results and safety profile of autologous osteochondral graft from the upper tibio-fibular joint applied to reconstruct symptomatic osteochondral lesions of the knee. METHODS: Thirty-one patients (22 men and 9 women) with grade 4 cartilage lesions in the knee were operated by mosaicplasty technique using autologous osteochondral graft from the upper tibio-fibular joint, between 1998 and 2006. Clinical assessment included visual analog scale (VAS) for pain and Lysholm score. All patients were evaluated by MRI pre- and post-operatively regarding joint congruency as good, fair (inferior to 1 mm incongruence), and poor (incongruence higher than 1 mm registered in any frame). Donor zone status was evaluated according to specific protocol considering upper tibio-fibular joint instability, pain, neurological complications, lateral collateral ligament insufficiency, or ankle complaints. RESULTS: Mean age at surgery was 30.1 years (SD 12.2). In respect to lesion sites, 22 were located in weight-bearing area of medial femoral condyle, 7 in lateral femoral condyle, 1 in trochlea, and 1 in patella. Mean follow-up was 110.1 months (SD 23.2). Mean area of lesion was 3.3 cm2 (SD 1.7), and a variable number of cylinders were used, mean 2.5 (SD 1.3). Mean VAS score improved from 47.1 (SD 10.1) to 20.0 (SD 11.5); p = 0.00. Similarly, mean Lysholm score increased from 45.7 (SD 4.5) to 85.3 (SD 7.0); p = 0.00. The level of patient satisfaction was evaluated, and 28 patients declared to be satisfied/very satisfied and would do surgery again, while 3 declared as unsatisfied with the procedure and would not submit to surgery again. These three patients had lower clinical scores and kept complaints related to the original problem but unrelated to donor zone. MRI score significantly improved at 18-24 months comparing with pre-operative (p = 0.004). No radiographic or clinical complications related to donor zone with implication in activity were registered. CONCLUSIONS: This work corroborates that mosaicplasty technique using autologous osteochondral graft from the upper tibio-fibular joint is effective to treat osteochondral defects in the knee joint. No relevant complications related to donor zone were registered.
    2012Journal article Open access Show more