The Distribution of Impingement Region in Cam-Type Femoroacetabular Impingement and Borderline Dysplasia of the Hip With or Without Cam Deformity: A Computer Simulation Study.
Arthroscopy
; 33(2): 329-334, 2017 Feb.
Article
em En
| MEDLINE
| ID: mdl-27815008
ABSTRACT
PURPOSE:
To identify the distribution of the impingement region in cam-type femoroacetabular impingement (FAI) or patients with borderline developmental dysplasia of the hip (DDH) using computer simulation analysis.METHODS:
A total of 51 painful hip joints from 42 consecutive cases diagnosed as cam-type FAI (center edge [CE] angle ≥ 25°, alpha angle ≥ 55°) or borderline DDH (CE angle ≥ 20° and < 25°) with or without a cam deformity (alpha angle ≥ 55° or < 55°) were enrolled. ZedHip (Lexi, Tokyo, Japan) 3-dimensional computer simulation was used to identify impingement points. Computed tomography data were used for 3-dimensional modeling and impingement simulation. The maximum flexion angle and maximum internal rotation angle at 90° were evaluated. The impingement point was identified at a position of maximum internal rotation and 90° of flexion. Six impingement regions were defined. Differences in the distribution of the impingement region were evaluated between groups.RESULTS:
There were significant differences in range of motion at maximum flexion and internal rotation among the 3 groups (P < .0001). There was no significant difference in the distribution of the impingement point in the cam-type FAI group (P = .71); similarly, there was no significant difference in the borderline DDH with a cam deformity group (P = .071). On the other hand, in terms of proximal or distal sites, there was a significant difference between the borderline DDH with and without a cam deformity group (P < .001).CONCLUSIONS:
The impingement region in cases of cam-type FAI was variable. The coexistence of a cam deformity affected the distribution of the impingement region in cases of borderline DDH; the region tended to be distributed across proximal rather than distal regions. The site of cam osteochondroplasty should be based on the identified impingement point, particularly in cases of cam-type FAI and borderline DDH with a cam deformity. LEVEL OF EVIDENCE Level IV, case control study.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Impacto Femoroacetabular
/
Luxação Congênita de Quadril
Tipo de estudo:
Etiology_studies
/
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Limite:
Female
/
Humans
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Male
/
Middle aged
Idioma:
En
Revista:
Arthroscopy
Assunto da revista:
ORTOPEDIA
Ano de publicação:
2017
Tipo de documento:
Article