Biomedical subjects

Z Jónás

Publications and source records attributed to Z Jónás.

3 recordsLinked to original sources

PubMed2000

The 'rotational preconstraint'.

This model provides a novel view of the etiology of some scolioses and can answer some of the biomechanical questions regarding pathogenesis of dorsal curves. According to our findings, paravertebral muscular imbalance is likely to favour such a pathological condition which, with the interference of the postural reflexes and the body weight-related vertical loading, might lead to the formation of a true scoliotic curve. Review of earlier research studies in the light of our findings reveals controversy in some authors' reported results and their own interpretations and seems to generally support our theory.

Humans↗

PubMed1997

Experimental studies for the surgical correction and fixation of dorsal spine deformities.

One of the specific features of the scoliosis operations with a posterior approach is that both the correction of the deformity and then the maintaining of the corrected situation are carried out with the help of the implants. With the currently applied systems based on the CD principle it is still difficult to control the rotational component of the scoliotic curve. To complement the systems based on the CD principle, we have developed an implant family whose application makes the correction of the dorsal deformity generally simplier and derotation more effective. Our method is based on the application of such hooks which, linked to the longitudinal rods and hooked on both transverse processes of the instrumented vertebrae, transmit the concerted forces exerting their influence in the direction of the correction. Depending on their symmetrical relations, the hooks are capable of tilting in the frontal plane and derotating in the horizontal plane simultaneously, in the direction of our choice. The stability and applicability of the hooks were tested in implants into cadavers, and then the intimate relations of the implants were examined by means of radiological tests and dissection on instrumented specimens. On the basis of our results, the implants can already be used in clinical practice.

Cadaver↗

PubMed1997

The pathological plica in the knee.

Fourteen patients were evaluated who had an arthroscopic removal of the symptomatic mediopatellar plica of the knee in this retrospective study. The main complaint of the patients was the pain at the medial side of the knee. Before the operation only in 3 cases was the diagnosis the pathological plica. The arthroscopy was performed in a routine way. The plica was consider pathological, and removed, when it was thickened. There was grade I or II chondropathy in the knee on the medial femoral condyle and the patella respectively, caused by the plica. Good to excellent result were obtained in 93% of the knee with or without chondromalacia.

Adolescent↗