Cam module, femoral trial, intercondylar cutting guide, and system
To stably maintain a fitting state to an opening portion by reducing a likelihood of displacement and detachment from the opening portion of a femoral trial. A cam module of the present disclosure includes a first connection portion disposed at a first end portion provided in a side wall portion and connectable to the femoral trial, and a second connection portion disposed at a second end portion provided in the side wall portion and connectable to the femoral trial.
1 . A cam module comprising:
a pair of side wall portions, each side wall portion comprising a first end portion and a second end portion different from the first end portion in a longitudinal direction;
a first connection portion disposed at the first end portion of the pair of side wall portions and connectable to a femoral trial; and
a second connection portion disposed at the second end portion of the pair of side wall portions and connectable to the femoral trial,
the cam module configured to fit into an opening portion of the femoral trial, wherein
the cam module further comprises a rotation pile portion that is configured to be rotatably supported at a predetermined location on the opening portion, wherein upon the cam module being rotated to a predetermined position in the opening portion, the second connection portion is configured to come into contact with the femoral trial,
the first connection portion comprises a first connection portion body portion, the rotation pile portion, and a base portion, the base portion being connected to a bone side of the first end portion, and
the base portion has a shape such that the base portion protrudes from the body portion toward the bone side, and has a length such that the base portion is configured to not come into contact with a bone upon the cam module being rotated to the predetermined position on the opening portion when an osteotomy, which is performed with use of an intercondylar cutting guide that includes a cutting guide portion exposed in accordance with a shape of the opening portion of the femoral trial, has been performed, and the base portion is configured to come into contact with the bone upon the cam module being rotated to the predetermined position on the opening portion the osteotomy has not been performed.
2 . The cam module according to claim 1 , further comprising
an urging member at each side wall portion of the pair of side wall portions, the urging member causes an urging force toward the femoral trial and configured to come into contact with the femoral trial upon the cam module being fitted to a predetermined position in the opening portion.
3 . A system comprising:
the cam module according to claim 1 ;
a femoral trial; and
an intercondylar cutting guide, wherein
the femoral trial comprises:
an opening portion for fitting the cam module comprising a pair of side wall portions, each side wall portion comprising a first end portion and a second end portion different from the first end portion in a longitudinal direction, a first connection portion disposed at the first end portion of the pair of side wall portions, and a second connection portion disposed at the second end portion of the pair of side wall portions, wherein
the opening portion further comprises:
a support portion supporting the first connection portion disposed in the cam module on a front side; and
a contact portion on a rear side of which the second connection portion disposed in the cam module comes into contact, and
the intercondylar cutting guide comprises:
a cutting guide portion that is exposed in accordance with a shape of an opening portion of a femoral trial; and
an attachment portion configured to attach the cutting guide portion to a predetermined position on the femoral trial by a magnetic force, wherein
the intercondylar cutting guide configured to guide an osteotomy through the opening portion.
4 . The system of claim 3 , wherein
either one of the cam module or the intercondylar cutting guide is attachable to the femoral trial at the same time.
5 . The system of claim 3 , further comprising:
a slap hammer comprising a first tip portion and a second tip portion, the first tip portion being engageable with the cam module, and the second tip portion being engageable with the femoral trial.
6 . The system according to claim 3 , further comprising:
a slap hammer comprising a first tip portion provided at one end portion in a longitudinal direction, the first tip portion comprising an engagement portion engageable with an engagement hole of the femoral trial, and two projecting portions protruding outward perpendicular to an axis in the longitudinal direction at a tip of the engagement portion, and the first tip portion being engageable with the engagement hole by inserting the engagement portion into the engagement hole together with the projecting portions and rotating the engagement portion about the axis in the longitudinal direction.
7 . The system according to claim 6 , wherein
the slap hammer comprises
a shaft extending along the longitudinal direction; and
a handle through which the shaft can be inserted, and slidable in the longitudinal direction, wherein
an opening portion of the handle through which the shaft is inserted has a circular shape.