Evaluasi Kinerja Biomekanik Dual mobility hip implant pada Total Hip Arthoplasty melalui Analisis Elemen Hingga

Azizah, Maisarah (2026) Evaluasi Kinerja Biomekanik Dual mobility hip implant pada Total Hip Arthoplasty melalui Analisis Elemen Hingga. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dual mobility (DM) hip implant dikembangkan untuk meningkatkan stabilitas sendi dan memperluas range of motion (ROM) pada pasien total hip arthroplasty. Namun, gerakan salat melibatkan fleksi dan rotasi sendi panggul yang relatif besar sehingga dapat meningkatkan konsentrasi tegangan, tekanan kontak, keausan, dan risiko impingement. Penelitian ini bertujuan mengevaluasi pengaruh variasi diameter femoral head 22 mm dan 28 mm terhadap respons biomekanik inner liner berbahan ultra-high-molecular-weight polyethylene (UHMWPE) ketika posisi salat. Model tiga dimensi yang terdiri atas femoral stem, femoral head, inner liner, outer liner, dan acetabular cup dibuat menggunakan SolidWorks dan dianalisis menggunakan metode elemen hingga pada ANSYS Transient Structural. Simulasi dilakukan pada enam kondisi, yaitu tahiyat awal kaki kanan dan kiri, tahiyat akhir kaki kanan dan kiri, ruku, serta sujud. Parameter yang dianalisis meliputi equivalent von Mises stress, contact pressure, safety factor, kejadian impingement, dan prediksi linear wear berdasarkan model keausan Archard. Hasil simulasi menunjukkan bahwa peningkatan diameter femoral head dari 22 mm menjadi 28 mm menurunkan rata-rata tegangan von Mises maksimum pada inner liner dari 5,53 MPa menjadi 3,02 MPa. Hal ini disebabkan oleh konfigurasi femoral head berdiameter 28 mm yang menghasilkan luas bidang kontak efektif lebih besar, sehingga beban yang bekerja dapat terdistribusi pada area yang lebih luas. Tegangan tertinggi pada kedua konfigurasi terjadi saat ruku, yaitu 7,54 MPa pada head 22 mm dan 7,26 MPa pada head 28 mm, dengan safety factor minimum masing-masing 3,05 dan 3,20. Seluruh tegangan masih berada di bawah yield strength UHMWPE sebesar 23 MPa, sehingga material masih diprediksi bekerja dalam daerah elastis. Impingement neck-inner liner terjadi pada 5 dari 6 kondisi pada head 22 mm, tetapi hanya 2 dari 6 kondisi pada head 28 mm. Prediksi linear wear tertinggi terjadi pada head 22 mm saat sujud sebesar 1,18 × 10⁻⁸ m/gerakan, sedangkan head 28 mm menghasilkan 4,69 × 10⁻⁹ m/gerakan. Secara keseluruhan, femoral head 28 mm memberikan respons biomekanik yang lebih baik karena menghasilkan tegangan lebih rendah, safety factor lebih tinggi, kejadian impingement lebih sedikit, dan prediksi keausan yang lebih rendah pada enam gerakan salat.
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Dual mobility (DM) hip implants were developed to improve joint stability and increase the range of motion (ROM) in patients undergoing total hip arthroplasty. However, Islamic prayer movements involve relatively large degrees of hip flexion and rotation, which may increase stress concentration, contact pressure, wear, and the risk of impingement. This study aims to evaluate the effect of 22 mm and 28 mm femoral head diameters on the biomechanical response of an ultra-high-molecular-weight polyethylene (UHMWPE) inner liner during prayer postures. A 3D model consisting of a femoral stem, femoral head, inner liner, outer liner, and acetabular cup was developed using SolidWorks and analyzed using the finite element method in ANSYS Transient Structural. Simulations were performed under six conditions: initial tahiyat with the right and left leg positions, final tahiyat with the right and left leg positions, bowing (ruku), and prostration (sujud). The analyzed parameters included equivalent von Mises stress, contact pressure, safety factor, impingement occurrence, and predicted linear wear based on the Archard wear model. The simulation results showed that increasing the femoral head diameter from 22 mm to 28 mm reduced the average maximum von Mises stress in the inner liner from 5.53 MPa to 3.02 MPa. This reduction occurred because the 28 mm femoral head configuration provided a larger effective contact area, allowing the applied load to be distributed over a wider region. The highest stress in both configurations occurred during bowing, reaching 7.54 MPa for the 22 mm head and 7.26 MPa for the 28 mm head, with minimum safety factors of 3.05 and 3.20, respectively. All stress values remained below the UHMWPE yield strength of 23 MPa, indicating that the material was predicted to remain within the elastic region. Neck–inner liner impingement occurred in five of the six conditions for the 22 mm head, but in only two of the six conditions for the 28 mm head. The highest predicted linear wear occurred for the 22 mm head during prostration, with a value of 1.18 × 10−8m per movement, whereas the 28 mm head produced a value of 4.69 × 10−9m per movement. Overall, the 28 mm femoral head demonstrated a better biomechanical response by producing lower stress, a higher safety factor, fewer impingement occurrences, and lower predicted wear across the six prayer movements.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Dual Mobility, Total hip Arthroplasty, range of motion, contact pressure, gerakan salat
Subjects:	R Medicine > R Medicine (General) > R857.M3 Biomedical materials. Biomedical materials--Testing. R Medicine > RD Surgery > RD755.5.C35 Orthopedic implants.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User:	Maisarah Azizah
Date Deposited:	05 Aug 2026 02:52
Last Modified:	05 Aug 2026 02:52
URI:	http://repository.its.ac.id/id/eprint/143855

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