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    Arthroscopic mediopatellar plicaectomy and lateral retinacular release in mechanical patellofemoral disorders
    (Springer-Verlag, 2002) Çalpur, OU; Tan, L; Gürbüz, H; Moralar, U; Çopuroglu, C; Özcan, M
    Arthroscopy was performed on 168 knees of 164 patients with anterior knee pain by a single arthroscopic surgeon between April 1993 and March 2000, with a mean follow-up of 29 months. There were 168 mediopatellar plicae, 16 infrapatellar plicae, 8 suprapatellar plicae, and 30 lateral plicae, and all plicae were excised. Lateral retinacular release was performed in 74 patients with patellar lateral compression syndrome, patellar lateralization, and patellar lateral subluxation through anterolateral portal without using a third portal with the help of a hook knife. Debridement and drilling were performed in type 3 and 4 chondropathies (Outerbridge classification), and cartilage debridement was performed in type 2 chondropathies. We examined the effect on morbidity and prognosis of the arthroscopic lateral retinacular release through the standard anterolateral portal; the results of condylar chondropathies and debridement and drilling applied to the chondropathies were also evaluated. Mediopatellar plica was seen to play a mechanical role in the development of medial femoral chondropathy, which confirms that excision of plica is a prophylactic procedure. A further successful method is lateral retinacular release applied through the standard anterolateral portal with conventional methods without using a third portal at the cases with patellar lateral compression syndrome, patellar lateralization, and patellar lateral subluxation. Classical debridement and drilling methods are cheap and easy for the treatment of chondropathy. We consider these methods still to be useful methods of treatment.
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    Casimir energy between two concentric half spheres
    (Elsevier Science Bv, 2005) Özcan, M
    We consider the Casimir effect for the massless scalar field between two concentric half spheres. The Casimir energy of a massless scalar field subject to the boundary conditions between two concentric half spheres are calculated by using a direct mode summation with contour integration in the complex plane of eigenfrequencies. We devoleped a new approach appropriate for the calculation of the Casimir energy for spherical boundary conditions without the use of the asymptotic Debye approximation. All contributions in Casimir energy come from the high frequency modes at fixed l between two surface boundary conditions. We have obtained the negative sign of the Casimir energy for a massless scalar field between two concentric half spheres. The massless scalar field is regarded as interesting both by itself and as the key to describing of the electromagnetic case. (c) 2005 Elsevier B.V. All rights reserved.
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    Deltoid (triangular)-shaped anterior cruciate ligament that caused notch impingement
    (W B Saunders Co-Elsevier Inc, 2004) Çalpur, OU; Özcan, M; Gürbüz, H
    In this article, we present 2 previously unreported cases of anterior cruciate ligaments (ACL) that had a wide deltoid (triangular)-shaped tibial insertion in the coronal plane that caused impingement at the intercondylar notch, inferior parts of patellofemoral sulcus, and the posterior cruciate ligament (PCL). Ligamentoplasty was used in both cases. Inferomedial and inferolateral parts of the ACL that caused impingement were excised, and the normal width of the tibial insertion of the ACL was provided.