Abstract
Aiming at the lack of timely and effective evaluation of knee anterior cruciate ligament (ACL) reconstruction, a knee ACL force and displacement measuring instrument was developed. Test experiments were carried out using a laboratory-made test platform and a robotic arm. Firstly, the importance of anterior cruciate ligament reconstruction surgery is introduced. The necessity of this kind of measuring instrument is proposed. The reliability of the lower stiffness measuring instrument under different measurement conditions in space is verified by the mechanical model of the previous ACL in-situ measurement. Then the design structure and measurement system of the instrument are introduced in detail. Finally, using the laboratory-made test platform and the UR5 robot arm and stiffness measuring instrument for the displacement and force test accuracy experiments, and the pig bone anterior cruciate ligament test and postoperative evaluation experiments, prove that the measuring instrument can be used for ACL Assessment of reconstructive surgery.
Highlights
The knee joint plays an important role in the upright, walking and jumping of the human body
The experimental content includes the test of displacement accuracy and tensile force, and the lateral force model of anterior cruciate ligament (ACL) is verified in different angles in space
The stiffness measuring instrument is mounted on the UR5 arm end effector, and the arm is adjusted so that the tensile direction of the stiffness measuring instrument is stretched to the ligament
Summary
The knee joint plays an important role in the upright, walking and jumping of the human body. The knee cruciate ligament is an important part of the ligament joint capsule network It plays a role in connecting the lower end of the femur and the upper end of the humerus [1]. It has the function of restricting the movement of the anterior and posterior tibia. ACL navigation surgery still has 8 % to 25 % of unsuccessful cases [2,3,4], and doctors after reconstruction surgery The ligament assessment is derived from the patient's subjective perception, joint stability test, and postoperative X-ray or CT fluoroscopy, which is not very accurate and lacks authenticity [5]. In view of the above problems, combined with the real environment of the knee joint, this paper designed a mechanical property testing instrument for the ligament reconstruction of the knee joint ACL reconstruction, and used the mechanical model proposed by the laboratory to verify the function of the instrument [6]
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