Analiza trajnosti bescementne femoralne komponente endoproteze kuka

Abstract

Uloga ove studije je da se na osnovu matematičkog modela i četiri parametra: telesne težine, femoralnog offset-a, fizičke aktivnostii životnog stila, proceni trajnost femoralne komponente endoproteze kuka. Materijal i metode U studiju je uključeno ukupno 18 bolesnika(12 žena i 6 muškaraca), uzrasta 35–55 godina kojima je 1990. godine, na IOHB „Banjica“, ugrađena totalna endoproteza kuka, i na kojima je zatim, u istoj ustanovi, naknadno izvršena njena revizija. Kriterijumi za uključivanje pacijenata u studiju bilisu: precizna veličina i pozicija femoralnog stema, mladii aktivni pacijenti sa dobrim kvalitetom kosti, dok sukriterijumi za isključenje iz studije bili: značajana displazija kuka, bolesnici sa sistemskim bolestima i bolesnici sa značajnim preoperativnim invaliditetom. Rezultati Matematičkim modelom iizračunavanjem parametara na osnovu podataka za tri bolesnika, uspeli smo da predvidimo trajnost femoralne komponente endoproteze kuka za ostalih 15 bolesnika. Koristili smo Man-Vitni U test (Mann-Whitney U test) da bismo uporedilirezultate dobijene matematičkim modelom i stvarne rezultate trajanja endoproteze (p=0.713) koji su pokazaliizuzetnu preciznost matematičkog modela. Statistička analiza urađenaje Statistica softverom (Statsoft, Dell). Prosečno trajanje endoproteze kod bolesnika ženskog pola bilo je nešto duže (240.89 meseci) u odnosu na pacijente muškog pola (199.5 meseci), ali razlika nije statistički značajna (MWU test, p=0.07). Sa druge strane, telesna težina, dnevna aktivnost i femoralnioffset pokazalisu značajnu statističku korelaciju (p< 0.05). Sobzirom na statističke rezultate, došlo se do zaključka da ni godine starosti, kao ni pol, nemaju značajan uticaj na trajnost endoproteze kuka...

The purpose of this work is to develop a new mathematical model that can accurately predict the durability of a hip prosthesis due to the following four parameters: body weight, femoral offset, duration and intensity of daily physical activities of a patient. Methods We retrospectively reviewed data of 18 patients (12 female and 6 male) who underwent total hip arthroplasty in 1990 and who subsequently went on to revision surgery.The average age of patients in this study group was 38.2 years (range 35–55 years). Inclusion criteria for choosing patients were: accurate size and positioning of femoral stem, young and active patients with good bone quality, while the exclusion criteria were: significant dysplasia of the hip, patients with systemic diseases and patients with significant preoperative functional disability. Results Based on mathematical model and the calculation of parameters by the data of three patients, a formula was used to calculate the predicted durability of each person’s prosthesis for 15 patients to assess the compliance between predicted and actual results.The Mann-Whitney U test of ranks was performed to compare the distribution of calculated values and recorded values of the prosthesis duration, resulting in acceptance of the hypothesis of their equality (p = 0.713).The average duration of prostheses in female patients was slightly higher (240.89 months) than in male patients (199.5 months), but this difference did not perform as statistically significant (MWU test, p = 0.119).On the other hand, body mass (Q), daily exercise activity (T) and femoral offset (h) have all proven to have a statistically significant correlation (p<0.05). Therefore, we can conclude that neither age nor gender have a significant impact on the expected duration of prostheses...