An adjustable spacer instrument and method of use in a knee arthroplasty procedure are described. The instrument comprises a first member having a substantially planar upper surface and a second member having a substantially planar lower surface. An angular adjustment mechanism is interposed between the first and second members and is operable to adjust the degree of tilt between the upper surface and the lower surface and includes a releasable lock which can maintain the degree of tilt.Linvention concerne un instrument despacement ajustable et un procédé dutilisation dans une intervention darthroplastie de genou. Linstrument comprend un premier élément ayant une surface supérieure sensiblement plane et un second élément ayant une surface inférieure sensiblement plane. Un mécanisme dajustement angulaire est interposé entre les premier et second éléments et est apte à ajuster le degré dinclinaison entre la surface supérieure et la surface inférieure et comprend un élément de verrouillage libérable qui peut maintenir le degré dinclinaison.
