Lazcano MMA, Sauri AJC

Language: Spanish
References: 13
Page: 167-171
PDF size: 310.04 Kb.

ABSTRACT

Thompson and Austin Moore partial prosthesis were designed before the cement era. Bipolar prosthesis produce osteolisis due to polyethylene particles, and after 6 months acts as one piece. All of them produce acetabular erosion and protrusion into the pelvis. Cup arthroplasties did not produce acetabular erosion to the pelvis, probably, because the acetabular cartilage is reamed. A monopolar partial cromo cobalt prosthesis was designed with a femoral Charnley type component with a posterior flanged cobra and a proximal, 140° from the center of the femoral head to the stem. The purpose of this paper is to study acetabular erosion and protrusion with the new prosthesis. From November 1991 to November 1997, we performed 52 hemiarthroplasties in 51 patients, 7 patients died within the first 24 months after the operation and were excluded from the study, 45 hips with complete follow up, some of them with X rays control. Average age 74 years. 40 females and 5 males. They type of fracture was: 1 basicervical; 0 Garden I; 9 Garden II; 5 Garden III and 30 Garden IV. Operation was performed with the Gibson approach. Clinical results were evaluated according to the Merle D’aubigne classification for pain were 45 preop to 249 postop; motion from 45 to 224 and gait 45 to 215. Measurement of the acetabular wall with the Rosen method was 13.12 mm. Nine hips (20%) had acetabular erosion average of 3.45 mm. There were no acetabular protrusions, one of the hips with 5 mm eroded toward the ilium. 93% of the patients were satisfied with the operation.

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