Vol.4, No 17, 2005 pp. 367-372
UDC 531/534:611(045)=20
Letter to Editor
MECHANICAL ROLE OF CRUCIATE LIGAMENTS
IN FLEXION
AND EXTENSION EXPRESSED GEOMETRICALLY
Swapan Kumar Adhikari
Head of the Institution, Ghusuri Uchcha Madhyamik Vidyalaya (High)
190, 191, Naskar Para Road, Howrah, West Bengal, 711 107
E-mail: swapku_adhi@rediffmail.com
Phone : 91 33 2655-2627 (R); 91 33 2655-5370 (O); 91 33 2109-8177 (M)
Abstract. The author tries to locate the movements of femur and
tibia in flexion and extension and thereby to find curves on which
centre
of curvature of femur, instantaneous centre of cruciate ligaments and
tibial
surface move. Also find the geometrical relations among the curves to
establish
the mathematical stability of knee-joint during its movements.
Key words: Centre of curvature, envelope, evolute, four-bar
linkage, hinge-motion, pedal-curve, pole, semi-cubical parabola.
GEOMETRIJSKI OPIS MEHANIČKE ULOGE
UKRŠTENIH LIGAMENATA U SAVIJANJU I OPRUŽANJU
Autor je pokušao da lokalizuje pokrete golenjače i butne kosti u
savijanju
i opružanju, kao i da nadje centre krivih butne kosti, kao i trenutni
centar
ukrštenog ligamenta i kretanje gornje površine golenjače. Takodje da
nadje
geometrijska odnose izmedju krivih radi uspostavljanja matematičkih
kriterijuma
stabilnosti kolenog zgloba u njegovom kretanju.
Ključne reči: Centar krive, anvelopa, evoluta, zglobni
četvorougao,
zglobno kretanje, kriva zglobne površi, pol, semi kubna parabola.
