The total Walldius knee endoprosthesis in combination with retropatellar facet replacement (Polyethylene). Indication, operative procedure, and clinical results in a two year follow‐up study

The introduction explains the general problems of knee joint replacement by artificial hinge-type prostheses, due to the reduction of the physiological "degrees of freedom" to only rotational movements around a horizontal axis. These problems are compared with the advantages of this type of prosthesis. Subsequently a description of some significant constructional characteristics of the hinge-type prosthesis, 13 given as there are placement of the joint, size of the contact surface, safety of the rotational device, design of the hinge-mechanism, the patella shield and the prosthetic stems as well as the breaking of dynamic forces, which all are subsequently compared in their values. Finally a hinge-type prosthesis is described with characteristics judged optimal according to our present scientific knowledge. We statistically evaluated our material of hinge-type prostheses with regard to final results and frequency of serious complications.

show abstract

The applicability of porous polyethylene for tympanoplasty

Handrock

Mulch

Handrock

1979

Arch Otorhinolaryngol

View full text Add to dashboard Cite

The problem of a replacement material for the reconstruction of the posterior wall of the auditory canal, as well as for the obliteration of the radical cavity has not been solved satisfactor;ly so far. In order to examine the possible applicability of porous plastics, the posterior wall of the auditory canal of guinea pigs was first removed and then reconstructed using porous polyethylene and filling the bulla tympanica with fine polyethylene chips. One third of the animals had an infected middle ear at the time of implantation. Histologic assessments were made until 24 weeks after implantation. In 80% of the animals the implant settled well, even in cases where the middle ears had been originally infected. By proliferation of vessels and connective tissue, the polyethylene had almost been completely integrated into the surrounding tissue after one week. Extent and frequency of metaplastic osseous growth was greater inthe chip-filled bulla than in the reconstructedposterior wall(Fig. 9). After four weeks, the new osteoid substance was firmly connected with the regional bone (Fig. 4). According to these results, it would seem possible to use porous polyethylene even for the nonaseptic implant bed as it is found in the chronically infected middle ear.

show abstract

The total Walldius knee endoprosthesis in combination with retropatellar facet replacement (Polyethylene). Indication, operative procedure, and clinical results in a two year follow‐up study

Cited by 3 publications

References 7 publications

Problematics of Current Hinge-Type Artificial Knee Joints

Problematics of Current Hinge-Type Artificial Knee Joints

Zum gegenw�rtigen Stand k�nstlicher Kniegelenke vom Typ des Scharniergelenkes

The applicability of porous polyethylene for tympanoplasty

Contact Info

Product

Resources

About