Ajoint distractor (16) for distracting a patient's knee joint, the distractor comprising:a cradle (500) configured to receive and secure a sensor module,a first distractor (502) component movably coupled to a first side of the cradle, the first distractor component having a first tibial paddle and a first femoral paddle that extend from the first distractor component in an outwardly direction to repetitively contact the tibial paddle of the sensor module and a distal end of a femur of a patient, the first femoral paddle movable with respect to the first tibial paddle to define a first displacement between the patient's tibia and femur,a second distractor (506) component movably coupled to a second side of the cradle, the second distractor component having a second tibial paddle and a second femoral paddle that extend from the second distractor component in the outwardly direction to repetitively contact the tibial paddle of the sensor module and the distal end of a femur of a patient, the second femoral paddle movable with respect to the second tibial paddle to define a second displacement between the patient's tibia and femur,in which the first distractor component and the second distractor component are movable with respect to the cradle in the outwardly direction to permit selectively extending one of the distractor components beyond the other distractor component in the general direction of extension.
