Lower limbs isometric measuring device used for all-hip joint displacement operation

Abstract

The present invention discloses a lower extremities isometric measuring device used for total hip replacement and pertains to the technical field of medical equipments, including a connecting rod, two sleeves which are arranged on the connecting rod and are movably connected with the connecting rod, and four positioning pins which are detachably arranged on the two sleeves; when in total hip replacement, the lower extremities isometric measuring device is arranged at the femur side and acetabulum side, so as to respectively read the scale values at the junctions of the positioning pins which are positioned below the connecting sleeves and calculate the difference of the two values, then the connecting rod, the connecting sleeves and the positioning pins at the femur side are removed, after the installation of the hip prosthesis for standard trying mold, the hip joint is arranged at the first measuring position for measurement, the measurement value is compared with the measurement value before the dislocation, furthermore the present invention can reduce the degree and the incidence of the non-isometric low extremities to the greatest extent under the premise of not affecting the balance of the surrounding soft tissues of the hip joint by the adjustment of the insertion depth of the femoral prosthesis, the adjustment of the neck length and the usage of the prosthesis with the eccentric distance.

Description

technical field [0001] The invention relates to a measuring device for surgery, in particular to a lower limb isometric measuring device for total hip replacement, belonging to the technical field of medical devices. Background technique [0002] After hip replacement surgery, claudication is one of the most common symptoms and an important cause of patient dissatisfaction. There are many reasons for claudication after total hip arthroplasty, such as prosthesis loosening, infection, abnormal structural reconstruction, unequal length of the lower limbs, soft tissue imbalance around the hip joint, heterotopic ossification, neuromuscular imbalance, and other factors outside the hip joint. Factors such as degenerative diseases of the spine, knee and ankle joints, etc., and the most common reason is the unequal length of the lower limbs after surgery. Domestic Jishuitan Hospital Zhang Hong and others reported that after total hip replacement, the incidence of unequal length of l...

AI Technical Summary

Problems solved by technology

Therefore, it is very difficult to achieve equal length of the limbs and at the same time achieve a good balance of soft tissues around the hip joint if proper methods are not used in total hip arthroplasty

[0004] How to maintain the balance of the surrounding soft tissue and the equal length of the lower limbs after total hip arthroplasty is currently adopted: taking standard plain film before operation and performing preoperative template measurement. The size of the prosthesis used, the osteotomy plane of the femoral calcar, the femoral eccentricity and the length of the femoral neck used, but due to the influence of fat and thin patients, the magnification of X-ray film and some specific conditions in the operation, the accuracy is limited

Therefore, different authors adopted different methods in the operation to maintain the consistency of the length of the lower limbs and the balance of the soft tissues around the hip joint. The Kirschner wire 40 is added with an L-shaped connecting rod 50, and two Kirschner wires 40 are respectively fixed on the outer greater trochanter 30 of the hip joint 10 and the femur 20, and the connecting rod 50 is kept parallel to the longitudinal axis of the femur 20 during measurement, but the device It is easily affected by joint activities, that is, after the patient is measured, the hip joint moves, causing changes in the position of the joints before and after the measurement, thus affecting the measurement results, and often not parallel to the longitudinal axis of the femur, and its accuracy is limited

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