Epidemiological survey of adult floating hip fractures from 2010 to 2011

Abstract

Objective To analyze the clinical and epidemiologic features of adult floating hip fractures in 83 hospitals between 2010 and 2011. Methods A total of 83 representative hospitals in 31 Chinese provinces and cities took part in this survey. Patients of 16 years old and older with floating hip injury were included in the present analysis who had been admitted between January 2010 and December 2011. Their data of digital radiographs and basic records were collected retrospectively and analyzed. The old, pathological and periprosthetic fractures were excluded. The radiographs of fractures were classified by experienced orthopedic residents and verified by 2 orthopedic deans and one radiologist. The gender, age, concomitant fractures and fracture classification were analyzed. Those younger than 45 years old were defined as young, and those older than 45 years old as middle-aged and old. Results A total of 326 adult patients (335 floating hip fractures) were collected. By AO classification, there were 124 cases of type 61 pelvic ring fractures, accounting for 1.16% (124/10, 694) of contemporary type 61 ones, 211 cases of type 62 acetabular fractures, accounting for 6.65% (211/3, 174) of contemporary type 62 ones, and 333 cases of femoral fractures, accounting for 0.77% (333/42, 978) of contemporary type 3 ones. 245 cases (75.15%) were males and 81 (24.85%) females, 16 to 98 years of age (average, 41.35 years). 164 left hips and 162 right hips were involved. 215 cases were young and 111 ones middle-aged and old. Males dominated the 2 groups, with a proportion of 77.21% (166/215) and 71.17% (79/111) , respectively, showing no significant difference between the 2 groups (P>0.05). According to the Muller classification, 202, 115 and 9 cases were respectively types A, B and C, the age median and interquartile range of which were 40 (from 30.0 to 52.0) , 37 (from 26.0 to 51.0) and 37 (from 21.0 to 47.5) years, showing no significant difference (P>0.05). There were respectively 128, 79 and 8 cases of Muller types A, B and C in the young group, and respectively 74, 36 and 1 cases of Muller types A, B and C in the middle-age and old group, showing no significant difference between the 2 groups in constituent ratio of Muller types (P>0.05). A significant difference was found in distribution of femoral segments (31, 32 and 33) between Muller types A, B and C (P<0.017). There was a significant difference between the constituent ratios of Muller types A and B (P<0.05). Of all the floating hip fractures, the proximal femoral ones involving the acetabulum accounted the highest proportion, being 39.88% (130/326). Conclusions The most common type of floating hip fractures was Muller type A. Most of the patients were young men. The proximal femoral fractures involving the acetabulum accounted for the highest proportion. Key words: Hip injuries; Femoral fractures; Pelvis; Acetabulum; Epidemiology