Apparatus for detecting tuberosity displacement after humeral head replacement operation

Abstract

The invention relates to a detecting device for nodal displacement after displacement of head of hummers, belonging to technology field of biological mechanics test. The calibrating disk is fixed in disk foundation, the loading rocking bar is installed on calibrating disk, two retaining pieces are fixed in the center of loading rocking bar, one end of the head of humerus detecting is installed in the locating tank in middle of two retaining pieces, and the other end is equipped with scapula, which is installed in gripper mechanism for scapula, two blocks imitating muscle tensile force system are respectively fixed on block foundation and gripper mechanism, one end of rope is fixed on scapula and the other end is suspended with heavy objects. The binocular computer vision system aligning the symbolic object for nodal point of head of humerus. The data collecting system is collected with binocular computer vision system. The detection device in this invention not only meets the demand of two experiments of inside and outside rotating and anteflexion, but also solves problem of additional loading caused by inaccurate alignment, which reduces experiment fee greatly.

Description

technical field [0001] The invention relates to a detection device for tubercle displacement after humeral head replacement, belonging to the technical field of biomechanical experiments. Background technique [0002] Artificial humeral head replacement is an effective method for the treatment of complex proximal humeral head fractures. In 1970, Neer first reported the effect of artificial humeral head replacement in patients with significantly displaced three-part and four-part proximal humeral head fractures and fracture dislocations in his paper "Displaced proximal humeral fractures". 90% of the patients achieved satisfactory results after operation. However, a review of the subsequent literature found that no other author could replicate the effect of Neer's surgery. The postoperative results reported by these authors were significantly inferior to Neer's results, and sometimes the results after arthroplasty were even disappointing. It can be seen that patients with c...

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Problems solved by technology

Lieven F. De Wilde et al. (A new prosthetic design for proximal humeral fractures: Reconstructing the glenohumeral unit, Journal of Shoulder and Elbow Surgery, Volume 13, Number 4: 373-380) used infrared light-emitting diodes for research, but the accuracy is slightly poor

[0006] In addition, as a natural biological organ, the humeral head joint does not have a definite center of rotation, and the humeral head shaft has no definite central axis, which brings difficulties to the loading of the humeral head in experiments.

In all previous studies, the humeral head loading device used did not take into account the irregularity of the humeral head, which obviously affected the accuracy and authenticity of the experiment.

In addition, these studies were only conducted on the internal and external rotation of the forearm, and the forward flexion during postoperative rehabilitation was not included.

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