caa a22 4500 605455945 CHVBK 20210128100215.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00167-014-3338-1 doi (NATIONALLICENCE)springer-10.1007/s00167-014-3338-1 Tibiofemoral loss of contact area but no changes in peak pressures after meniscectomy in a Lapine in vivo quadriceps force transfer model [Elektronische Daten] [Andre Leumann, Rafael Fortuna, Tim Leonard, Victor Valderrabano, Walter Herzog] Purpose: The menisci are thought to modulate load transfer and to absorb shocks in the knee joint. No study has experimentally measured the meniscal functions in the intact, in vivo joint loaded by physiologically relevant muscular contractions. Methods: Right knee joints of seven New Zealand white rabbits were loaded using isometric contractions of the quadriceps femoris muscles controlled by femoral nerve stimulation. Isometric knee extensor torques at the maximal and two submaximal force levels were performed at knee angles of 70°, 90°, 110°, and 130°. Patellofemoral and tibiofemoral contact areas and pressure distributions were measured using Fuji Presensor film inserted above and below the menisci and also with the menisci removed. Results: Meniscectomy was associated with a decrease in tibiofemoral contact area ranging from 30 to 70% and a corresponding increase in average contact pressures. Contact areas measured below the menisci were consistently larger than those measured on top of the menisci. Contact areas in the patellofemoral joint (PFJ), and peak pressures in tibiofemoral and PFJs, were not affected by meniscectomy. Contact areas and peak pressures in all joints depended crucially on knee joint angle and quadriceps force: The more flexed the knee joint was, the larger were the contact areas and the higher were the peak pressures. Conclusions: In agreement with the literature, removal of the menisci was associated with significant decreases in tibiofemoral contact area and corresponding increases in average contact pressures, but surprisingly, peak pressures remained unaffected, indicating that the function of the menisci is to distribute loads across a greater contact area. European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA), 2014 Rabbit knee joint model nationallicence Load transfer nationallicence Contact pressure measurement nationallicence Dynamic muscle stimulation nationallicence Meniscus nationallicence Meniscectomy nationallicence Leumann Andre Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, T2N 1N4, Calgary, AB, Canada aut Fortuna Rafael Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, T2N 1N4, Calgary, AB, Canada aut Leonard Tim Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, T2N 1N4, Calgary, AB, Canada aut Valderrabano Victor Orthopaedic Department, University Hospital of Basel, Basel, Switzerland aut Herzog Walter Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, T2N 1N4, Calgary, AB, Canada aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/1(2015-01-01), 65-73 0942-2056 23:1<65 2015 23 167 https://doi.org/10.1007/s00167-014-3338-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-014-3338-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Leumann Andre Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, T2N 1N4, Calgary, AB, Canada aut NATIONALLICENCE 700 1- Fortuna Rafael Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, T2N 1N4, Calgary, AB, Canada aut NATIONALLICENCE 700 1- Leonard Tim Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, T2N 1N4, Calgary, AB, Canada aut NATIONALLICENCE 700 1- Valderrabano Victor Orthopaedic Department, University Hospital of Basel, Basel, Switzerland aut NATIONALLICENCE 700 1- Herzog Walter Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, T2N 1N4, Calgary, AB, Canada aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/1(2015-01-01), 65-73 0942-2056 23:1<65 2015 23 167