Author/Editor     Schara, Karin; Herman, S
Title     Heterotopic bone formation in total hip arthroplasty: predisposing factors, classification and the significance for clinical outcome
Type     članek
Source     Acta Chir Orthop Traumatol Cech
Vol. and No.     Letnik 68, št. 2
Publication year     2001
Volume     str. 105-8
Language     eng
Abstract     Purpose of the study Heterotopic bone formation in the area around the femoral head is a recognised complication following total hip arthroplasty. The aim of the study was to determine the prevalence of heterotopic ossification and to select a method of classification. Also, we studied the potential association of heterotopic bone with the following variables: sex, age at operation, operative technique, type of prosthesis and previous surgery on the ipsilateral hip. Material: The study involved 103 consecutive patients who underwent total hip replacement at our department in 1995.175 patients were excluded from the study. Among 103 patients there were 35 male and 68 female patients. Method Antero-posterior radiographs of the hips were reviewed preoperatively, six weeks after the operation and at one year after surgery. The degree of heterotopic bone formation was determined using the classifications of Brooker et al. (Grades 0-IV) and Kjaersgaard-Andersen et al. (Grades I and 11). Results Heterotopic bone has developed in 27 (26,2 %) patients, in 37 % of male patients, mean age 59,8 years, and in only 20,5 % female patients mean age 68,3 years. Brooker et al. Grade I ossification developed in 37 % of the patients, Grade II in 44,4 % and Grade III in 18,6 %. According to the Kjaersgaard-Andersen et al. classification 22 patients developed Grade I and 5 patients Grade II ossification. The leading indication for surgery was osteoarthrosis, followed by aseptic necrosis (7,4 %). Heterotopic bone formation was found in 20 % of all patients with aseptic necrosis of the femoral head. Only 2,7 % of patients operated on the ipsilateral hip developed ossifications. (Abstract truncated at 2000 characters)
Descriptors     HIP PROSTHESIS
FEMUR HEAD
OSSIFICATION, HETEROTOPIC
HIP JOINT
CAUSALITY
TREATMENT OUTCOME