Protocol detail

Patellar Dislocation Patients and Controls

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History of other knee surgeries

Developmental hip dysplasia

History of fracture of femur or tibia on the affected side.

A total of 89 patients with patellar dislocation were treated in our hospital from January 2019 to August 2020. Based on the above inclusion/exclusion criteria, thirty-five patients (24 females and 11 males) were included in this study. The control group consisted of patients with no radiological signs of trochlear dysplasia and no clinical signs of subjective/objective patellar dislocation. The control group was matched on age and sex, with a total of 35 patients included. Refer to Table 1 for patient demographics. This study was approved by the Ethics Committee of our hospital and informed consent was obtained from all participants.Table 1

Patient demographics

Group	Patient group(n = 35)	Control group(n = 35)	P
Mean age, yrs (SD)	21.08(5.59)	20.34(6.07)	n.s
Female:male, n	24:11	25:10	n.s
Mean BMI, kg/m² (SD)	24.09(4.52)	23.34(4.31)	n.s
Side,R:L	16:19	18:17	n.s

Dejour type
A	22
B	5
C	4
D	4

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Fan C., Niu Y, & Wang F. (2023). Local torsion of distal femur is a risk factor for patellar dislocation. Journal of Orthopaedic Surgery and Research, 18, 163.

Publication 2023

Females Femur Fracture of femur Fracture of hip Hospital ethics committee Knee Male Patellar dislocation Patient Radiological Tibia

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Variable analysis

independent variables

Patellar dislocation

dependent variables

Mean age
Gender (Female:male ratio)
Mean BMI
Side (Right:Left ratio)
Dejour type (A, B, C, D)

control variables

Gender

controls

Patients with no radiological signs of trochlear dysplasia and no clinical signs of subjective/objective patellar dislocation

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