Surgical instrument system

A surgical instrument system for use in a total knee arthroplasty, the surgical instrument system comprising:

• a reference block configured to be attached to a distal femur, the reference block having a block front side and a block rear side lying opposite the block front side along a proximal-distal axis;
• at least one compensation element having an element rear side and a contact face lying opposite the element rear side along the proximal-distal axis, the contact face configured to contact a lateral condyle and/or a medial condyle of the distal femur;
• and
• a connection system having at least one connection portion that is disposed on the reference block, and at least one complementary connection portion that is disposed on the at least one compensation element, the connection system being configured to releasably attach the at least one compensation element on the block front side, and
• the connection system being configured in such a manner that the at least one compensation element is attachable on the block front side in different positions.