External fixing rack gradually pulling device for treating stiff knee

Abstract

The invention relates to an external fixing frame gradual traction device for remedying knee joint stiffness and a method thereof. The invention uses the action theory of a lever, a cable and a pulley for slow and gradual retrenching traction on the far end of a crus by an external fixing frame and a cable to ensure that the crus bends gradually by taking the knee joint as a shaft along with the time, so as to achieve the goal that the bending action range of the knee joint is increased gradually. The method comprises the concrete steps as follows: 1) the external fixing frames are arranged on the thigh and the crus; 2) the external fixing frame of the thigh is fixed on a wedge bracket to hang the crus; 3) a steel cable system is arranged to draw the far end of the external fixing frame of the crus; 4) the steel cable is retrenched for multiple times every day to ensure that the steel cable pulls the crus to bend passively by taking the knee joint as the shaft, so as to increase the bending degree of the knee joint gradually; and 5) when the bending degree of the knee joint is increased by 15 to 30 degrees, the cable is released to carry out the active action and the passive action of the knee joint, solidify the action degree of the knee joint and avoid the bending stiffness of the knee joint. The method overcomes the disadvantage that the knee joint lysis has large injury and bad effect, and the method is the ideal method for improving the knee joint function practically.

Description

technical field [0001] The invention relates to the field of orthopedic treatment for knee joint stiffness, in particular to an external fixator progressively pulling through an external fixator, pulleys and cables to passively increase the degree of knee flexion to achieve minimally invasive and effective treatment of knee joint stiffness pulling device. Background technique [0002] Knee stiffness is a common complication after plaster fixation of lower extremity fractures or bone and soft tissue surgery around the knee joint (Wang JH, Zhao JZ, He YH.A New Treatment Strategy for Severe Arthrofibrosis of the Knee.J Bone Joint Surg(Am).2006 ;88:1245-1250). The mechanism of its occurrence is mainly caused by the scar fibrotic adhesion in the knee joint and the scar fibrotic adhesion between the quadriceps femoris muscle and the distal femoral shaft outside the joint (Bosch U. Arthrofibrosis. Orthopade. 2002 Aug; 31 (8): 785-790). At present, the main treatment methods for k...

AI Technical Summary

Problems solved by technology

[0003] 1) Knee joint manipulation loosening and functional exercise: early application has a good preventive effect on knee joint stiffness, and can also play a good role in improving mild knee joint stiffness; Stiffness has no obvious effect, and even when the strong manipulation is loosened, it often causes femoral shaft fracture or patellar tendon rupture (Magit D, Wolff A, Sutton K, et al. Arthrofibrosis of the knee. J Am Acad Orthop Surg. 2007; 15(11) : 682-694.)

Among them, the use of "electric knee mobilizers" for knee joint functional exercise can only play a preventive role, but has no therapeutic effect

[0004] 2) Gradually pressurize the knee flexion brace: (1) The therapeutic effect on severe knee joint stiffness is poor; (2) Long-term strong compression of the skin, muscles and other soft tissues of the thigh and calf may easily lead to local skin and muscle necrosis; (3) ) The treatment process is unbearably painful for the patient and cannot be tolerated, which often leads to interruption or abandonment of the treatment; (4) Even if you persist, the final result often easily leads to knee joint flexion, contracture and stiffness

(2) The treatment effect is poor: the expected degree of flexion is often not achieved during the operation; in addition, femoral shaft fractures or patellar tendon ruptures are also prone to occur when the manipulation is loosened after intraoperative release; Recurrent adhesions lead to the loss of some or most of the improved flexion during the operation. At present, prevention of re-adhesion after knee joint release is a long-term problem that has plagued the orthopedic community (Alexnder Creighton, BernadR.Bach.Arthrofibrosis: Evaluation, Prevention, and Treatment . Techniques in knee Surgery. 2005; 4(3): 163-172)

[0006] 4) Minimally invasive knee arthroscopic release surgery: Although this surgery has a small trauma and has a certain effect on knee stiffness with mild intra-articular adhesions, it is not effective for a large number of severe knee joints with extra-articular quadriceps adhesions. Joint stiffness has no obvious effect (Wang JH, Zhao JZ, He YH. A new treatment strategy for severe arthritis of the knee. Surgical technique. J Bone Joint Surg Am. 2007; Mar; 89 Suppl 2 Pt.1: 93-102)

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