title: The Monk "soft top" endoprosthesis. Clinical, biomechanical and histopathological observations.
abstract: This paper presents a prospective trial carried out using the Monk "soft top" endoprosthesis in 33 patients. Two years after operation 70 per cent of the remaining patients had pain. A biomechanical and histopathological analysis of the endoprosthesis and the surrounding tissue, obtained from a further two patients at the time of revision, is presented. It is concluded that the prosthesis has inherent design faults which result in excessive wear of the polyethylene component. The wear debris produced stimulates a prolific fibrous tissue reaction which is associated with progressive clinical deterioration.
mesh_terms: D000368:Aged; D001696:Biomechanical Phenomena; D001842:Bone and Bones / Q000473:pathology; D005260:Female; D005265:Femoral Neck Fractures / Q000601:surgery*; D005500:Follow-Up Studies; D006622:Hip Prosthesis / Q000009:adverse effects; D006801:Humans; D008297:Male; D010146:Pain / Q000209:etiology; D011095:Polyethylenes; D011183:Postoperative Complications; D011446:Prospective Studies; D011474:Prosthesis Design; D013193:Stainless Steel
chemical_list: D011095:Polyethylenes; D013193:Stainless Steel