Measurement instrument for joint surgery

A measurement instrument used in joint surgery to measure stability of a state of connection between a first bone and a second bone that are connected by soft tissue at a joint, comprising:

• a housing comprising a first part configured to be fixed to a component attached to the first bone;
• a slider configured to slide with respect to the housing in a first direction, and comprising a second part which is configured to abut against or be fixed to the second bone or a component attached to the second bone and is located next to the first part in a second direction intersecting the first direction;
• and
• a position display portion that displays a position of the slider relative to the housing,
• wherein the housing includes:
• a housing body that slidably supports the slider;
• and
• a component fixing portion that is detachably attached to the housing body and is configured to be fixed to the component attached to the first bone,
• wherein the second bone is configured for relative movement with respect to the first bone along a joint face that is between the first bone and the second bone by the slider sliding relative to the housing, and
• the stability of the state of connection between the first bone and the second bone is configured to be measured based on the position of the slider relative to the housing, wherein the position is displayed by the position display portion.