145.
Survival of bonelock cemented THA performed at Dpt of Orthopedic
Surgery Køge Hospital 1991-1993
Mohammed Jafar, Lene Kaavé, Leif Broeng
Dpt of orthopedic surgery Koege Hospital; Dpt of orthopedic surgery, Koege
Hospital; Dpt of orthopedic surgery, Koege Hospital
Background:
Bonelock cement was a Danish invention introduced before
sufficient clinical testing was completed. It was later known for its inferior
qualities causing the cement to be withdrawn from the market. At Dpt of
Orthopeadic surgery Køge Hospital 114 THA were performed between 1991
and 1993 using bonelock cement and Exeter prostheses. The patients have
afterwards been followed as outpatients with yearly controls.
Purpose / Aim of Study:
To better understand the impact of using bonelock
cement in the early 90´es. To produce a Caplan-Meier Graph for the cup and
stem visualizing time from surgery until time of revision or death of patient.
To radiographycally assess the state of THA components not revised in living
patient.
Materials and Methods:
Patients who has undergone surgery was already
identified due to the task of following all patients yearly as outpatients. 120
THA´s in 111 patients were on the list, however 6 not included, 4 cases had
revision surgery performed, 1 case had a different prostheses and in 1 case the
type of cement used was uncertain, hence 114 THA´s We collected patient
files and available x-rays from local archives. We identified the date of
primary surgery and date of revision of components or date of death. We
examined x-rays and made an assessment concerning looseness.
Findings / Results:
10
year survival of cup: 82 % 10 year survival of stem: 94
% 20
patients alive with 22 THA, of these 17 stem and 11 cups are not revised.
Conclusions:
10
year survival better than could be expected due to the inferior
cement. Stem performed better than cup which was not surprising due to the
polished double tapered stem of Exeter.
