HighlightsKnee osteoarthritis with severe valgus deformity is a challenging case.The correction usually requires the use of high-cost constrained knee implant.Non-constrained implant with ligament adjustment provide good outcome.
UWB (Ultra Wideband) merupakan suatu teknologi nirkabel yang dikembangkan sampai sekarang agar dapat memancarkan sejumlah data yang berukuran sangat besar pada jarak yang cukup dekat dengan bandwidth paling kecil sebesar 500 MHz dengan range pada frekuensi 3.1-10.6 GHz yang sering diaplikasikan untuk WIFI, smartphone dan radar, maka diperlukan perancangan antena yang dapat menghasilkan bandwidth yang cukup lebar. Penelitian ini membuat sebuah antena mikrostrip UWB dengan patch lingkaran untuk radar c-band yang disusun broadside array 2×2 menggunakan slot dengan teknik pencatuan langsung dan diharapkan bekerja pada range frekuensi c band yang memiliki nilai return loss > 20 dB, VSWR < 2, gain > 6 dBi, dan bandwidth > 500 MHz. Simulasi dilakukan dengan menggunakan perangkat lunak CST Studio Suite 2019 dengan memasukan parameter antena berdasarkan hasil perhitungan manual yang dilakukan, serta dilakukan optimasi untuk mendapatkan spesifikasi dari antena yang diharapkan. Dari hasil akhir simulasi didapatkan antena bekerja pada frekuensi kerja 6.204 – 6.760 GHz dengan frekuensi tengah di 6.5 GHz, return loss sebesar 41.1407 dB, lebar bandwidth sebesar 556.1 MHz dan VSWR sebesar 1.0176. Sedangkan pada hasil pengukuran antena mikrostrip patch lingkaran yang telah direalisasikan, antena bekerja pada frekuensi 6.150 – 6.720 GHz dengan frekuensi tengah di 6.390 GHz, return loss sebesar 30.62 dB, lebar bandwidth sebesar 570 MHz, dan VSWR sebesar 1.16.
Synovial osteochondromatosis can occur idiopathic or secondary to osteoarthritis. While joint replacement surgery has shown promising results for end-stage osteoarthritis, it isn’t always the answer for certain individual. In young athletic individual, the treatment should be patient specific, with consideration for return to sports activities. We present a 48-year-old ex-national professional football player with significant osteoarthritis and severe synovial osteochondromatosis. After discussion with the patient, we decide that knee preservation is suitable for him. Surgical treatments that are considered the best option are High Tibial Ostetomies, extraction of the loose bodies, partial synovectomy, and microfracture. Those procedures were performed in 8 months interval for each knee. The patient received intra-articular injection of cultured Mesenchymal Stem Cells (MSCs) with hyaluronic acid for 4 weeks after surgery. In a 34-month follow-up for right knee and 26-month follow-up for left knee, the patient regained significantly higher Knee injury and Osteoarthritis Outcome Score (KOOS) compare to before surgery (94 vs. 47). Radiologic examination also reveals the improvement of both knees joint space.
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