Epidemiological survey of adult floating knee injur in the Third Hospital of Hebei Medical University from 2008 to 2012
Zhang Fei, Dong Tianhua, Chen Wei, Liu Bo, Tian Ye, Zhu Yanbin, Chen Xiao, Yang Zongyou, Yang Guang, Liu Song, Zhang Yingze
Department of Orthopaedics, the Third Hospital of Hebei Medical University;Key Laboratory of Orthopaedic Biomechanics of Hebei Province; Orthopaedic Research Institution of Hebei Province, Shijiazhuang 050051, China
Abstract：Objective To analyze the clinical features of adult floating knee injury from 2008 to 2012, explore the differences between young and elderly patients in gender, concomitant fractures and fracture type composition, and provide a base of diagnosis, treatment, prevention and research for floating knee injury.Methods The data of the adult (≥16 years old) floating knee injury admitted to the Third Hospital of Hebei Medical University from January 2008 to December 2012 were retrospectively analyzed. All the fractures were acute and the pathological or periprosthetic fractures were excluded. The radiography of fracture were classified by 4 same experienced orthopedic residents and verified by two orthopedic deans and one radiologist. The gender, age, concomitant fractures and fracture classification were analyzed. The patients aged less than 45 years old were defined as young patients, and the patients older than 45 years old were defined as elderly patients.Results A total of 204 patients of adult patients with 208 floating knee were collected. The floating knees accounted for 0.40%(204/52 225) of all adult fractures, 3.93%(204/5 196) of adult femoral fractures and 2.49%(204/8 199) of adult tibia and fibula fractures. Among them, there were 173 males and 31 females. The ages of all the patients were between 16 and 85 years old, 153 of them were young patients and 51 patients were elderly patients. The male patients accounted for 90.20%(138/153) and 68.63%(35/51)in young patients and elderly patients, respectively, the difference had statistical sense(χ2=13.808, P＜0.01). One hundred and thirty-one patients which accounted for 64.22% of 204 patients of the floating knee injury accompanied by other fractures, mainly included 37 patients accompanied by foot fracture, 33 patients accompanied by radius and ulna fracture, 31 patients accompanied by pelvis-acetabular fractures, 25 patients accompanied by proximal femoral fractures, 25 patients accompanied by contralateral femoral fractures. These 131 sides contain 95 patients of young patients and 36 patients of elderly patients. There was no significant difference in the proportion of patients combined with other part fractures between young patients and elderly patients (χ2=1.202, P＞0.05). According to Fraser′s classification criteria, there were 87 sides of type Ⅰ fracture and 121 sides of type Ⅱ fracture. The number of knee of young patient who belonged to type Ⅰ, type Ⅱa, type Ⅱb and type Ⅱc were 70, 40, 16, 30, respectively. The number of knee of elderly patient who belonged to type Ⅰ, type Ⅱa, type Ⅱb and type Ⅱc were 17, 12, 5, 18, respectively. The composition ratio of various fracture had no significant difference between young patients and elderly patients( χ2=5.502, P＞0.05). In type Ⅱ fractures, fractures of type Ⅱb were at least (21), fractures of type Ⅱa and type Ⅱc had a similar proportion. Fractures of type Ⅱa (46.51%, 40/86) were more common than type Ⅱc fracture(34.88%, 30/86) in young patients, but type Ⅱc (51.43%, 18/35) fractures were more common than type Ⅱa(34.29%, 12/35)in elderly patients.Conlusions Young men are the at-risk population of floating knee injury and usually combied with other fractures. Compared to the femoral condyle, tibial plateau has a higher fracture risk, and the risk will increase with age.
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Zhang Fei, Dong Tianhua, Chen Wei, Liu Bo, Tian Ye, Zhu Yanbin, Chen Xiao, Yang Zongyou, Yang Guang, Liu Song, Zhang Yingze. Epidemiological survey of adult floating knee injur in the Third Hospital of Hebei Medical University from 2008 to 2012. Chinese Journal of Anatomy and Clinics, 2015, 20(2): 102-105.
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2015, Vol. 20 
