Measurer of eccentric distance of hip joint and extended limb length

Abstract

The invention discloses a measurer of the eccentric distance of a hip joint and the extended limb length. The scaled long straight section of an L-shaped limb length measuring rod (4) is fixedly connected with a scaled pointer (5) by a first cross connector (3); the short straight section of the L-shaped limb length measuring rod (4) is fixedly connected with one end of an eccentric distance measuring rod (2) by a second cross connector (6); the other end of the eccentric distance measuring rod (2) is fixedly connected with a positioning kirschner pin (1) by a universal connector (7); and thepinpoint of the scaled pointer (5) faces to one end where the positioning kirschner pin (1) is arranged. The measurer is accurate to measure, changes the limitation of the prior measurer aiming at measuring the limb length, simultaneously obtains two important measured data and fills in a gap that eccentric distance measurement can not be realized in a manual full hip joint replacement operation;and the measurer is convenient to dismount, does not influence the operation of an operation view and saves the operation time.

Description

technical field [0001] The invention belongs to a measuring device for orthopedic surgery, in particular to a measuring instrument for measuring eccentricity and limb extension in hip joint replacement surgery. Background technique [0002] In total hip arthroplasty, moderately lengthening the shortened limbs of the patient is of great significance in restoring the equal length of the lower limbs, ensuring the normal walking of the patient after surgery, and prolonging the life of the artificial prosthesis. At the same time, restoring the patient's normal eccentricity during the operation can help the patient recover normal abductor muscle strength as soon as possible, reduce the mechanical load of the prosthesis, and reduce the long-term loosening rate of the prosthesis. [0003] However, at present, there is no corresponding surgical instrument that can complete the measurement of the eccentricity, and the recovery of the eccentricity in all operations depends on the opera...

AI Technical Summary

Problems solved by technology

[0004] For the lengthening of the limbs, the commonly used methods in the operation include: (1) The surgeon measures with the transverse fingers of the palm under the premise of ensuring that the bilateral patellas are equal in the hip and knee flexion position; this method is subject to the patient’s pelvis size, obesity degree, Interference with many factors such as the range of motion of the hip joint. Due to the above factors, the position of the adduction and abduction of the hip joint causes a length error; the accuracy rate is low (2) Use a point on the pelvis and a point on the femur to pre-measure the distance between the two points Measure the distance between the two points again when using different trial models to lengthen the limbs to see if it is consistent with the increment measured before the operation, but the disadvantage is that the distance between the two points is not connected There is no long axis parallel to the lower limbs, forming an angular displacement, and the measurement data cannot accurately reflect the true length of the limb extension

Therefore, the existing method of measuring limb length in total hip arthroplasty has been proved to be wrong, and there is no method to measure the change data of patient's eccentricity

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