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Hip Morphology Characterization: Implications in Femoroacetabular Impingement in a Chilean Population.

Barrientos C, Diaz J, Brañes J, Chaparro F, Barahona M, Salazar A, Hinzpeter J - Orthop J Sports Med (2014)

Bottom Line: To describe the radiological features associated with FAI in an asymptomatic Chilean population.Depending on the cut points chosen for FAI-related parameters, between 39.6% and 69.3% of an asymptomatic Chilean population were found to have morphological features related to FAI.Our findings suggest that the proposed pathological threshold values in the literature cannot be extrapolated to a Chilean population, and this must be taken into consideration when evaluating Latin American patients with hip pain.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopaedic Surgery, Hospital Clínico Universidad de Chile, Santiago, Chile.

ABSTRACT

Background: Femoroacetabular impingement (FAI) is the result of a mechanical conflict in the hip joint, and its diagnosis is based on clinical and radiological parameters. To our knowledge, there are no published studies describing the radiologic characteristics of FAI in Latin American populations.

Purpose: To describe the radiological features associated with FAI in an asymptomatic Chilean population.

Study design: Cross-sectional study; Level of evidence, 3.

Methods: We prospectively recruited asymptomatic patients with no history or symptoms of hip pathology who underwent abdomen-pelvis computed tomography (CT) for a nonorthopaedic indication. The acetabular and femoral parameters related to FAI were measured.

Results: We studied 101 subjects (202 hips) with a mean age of 36.8 ± 14.4 years. The mean center-edge angle was 39.4° ± 7.2°. The crossover sign was present in 34 cases (33.7%). The mean alpha angle was 49.7° ± 8.3°. Depending on the cut points chosen for FAI-related parameters, between 39.6% and 69.3% of an asymptomatic Chilean population were found to have morphological features related to FAI.

Conclusion: Our findings suggest that the proposed pathological threshold values in the literature cannot be extrapolated to a Chilean population, and this must be taken into consideration when evaluating Latin American patients with hip pain.

No MeSH data available.


Related in: MedlinePlus

Alpha angle measurement. (A) The 3 cephalic, medium, and caudal neck levels were determined. (B) Measurement in the second level in an oblique axial computed tomography of the femoral neck.
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fig2-2325967114552800: Alpha angle measurement. (A) The 3 cephalic, medium, and caudal neck levels were determined. (B) Measurement in the second level in an oblique axial computed tomography of the femoral neck.

Mentions: The center-edge angle and the crossover sign were measured in a 3D transparent reconstruction, emulating a posterior anterior pelvis radiograph. The acetabular version was measured in axial cuts in the deepest part of the acetabulum, previously corrected in 3 planes (Figure 1).12,29 The alpha angle and the femoral neck offset were evaluated in axial oblique neck cuts.21 Three levels were determined (cephalic, medium, and caudal neck), and measurements were performed in the center of each level. This method allowed evaluation of the anterior-superior zone, which is considered a cornerstone in FAI (Figure 2). The femoral head-neck offset is the distance between the anterior margin femoral neck and the anterior margin of the femoral head and was evaluated in the same 3 zones as the alpha angle.


Hip Morphology Characterization: Implications in Femoroacetabular Impingement in a Chilean Population.

Barrientos C, Diaz J, Brañes J, Chaparro F, Barahona M, Salazar A, Hinzpeter J - Orthop J Sports Med (2014)

Alpha angle measurement. (A) The 3 cephalic, medium, and caudal neck levels were determined. (B) Measurement in the second level in an oblique axial computed tomography of the femoral neck.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2 - License 3
Show All Figures
getmorefigures.php?uid=PMC4555550&req=5

fig2-2325967114552800: Alpha angle measurement. (A) The 3 cephalic, medium, and caudal neck levels were determined. (B) Measurement in the second level in an oblique axial computed tomography of the femoral neck.
Mentions: The center-edge angle and the crossover sign were measured in a 3D transparent reconstruction, emulating a posterior anterior pelvis radiograph. The acetabular version was measured in axial cuts in the deepest part of the acetabulum, previously corrected in 3 planes (Figure 1).12,29 The alpha angle and the femoral neck offset were evaluated in axial oblique neck cuts.21 Three levels were determined (cephalic, medium, and caudal neck), and measurements were performed in the center of each level. This method allowed evaluation of the anterior-superior zone, which is considered a cornerstone in FAI (Figure 2). The femoral head-neck offset is the distance between the anterior margin femoral neck and the anterior margin of the femoral head and was evaluated in the same 3 zones as the alpha angle.

Bottom Line: To describe the radiological features associated with FAI in an asymptomatic Chilean population.Depending on the cut points chosen for FAI-related parameters, between 39.6% and 69.3% of an asymptomatic Chilean population were found to have morphological features related to FAI.Our findings suggest that the proposed pathological threshold values in the literature cannot be extrapolated to a Chilean population, and this must be taken into consideration when evaluating Latin American patients with hip pain.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopaedic Surgery, Hospital Clínico Universidad de Chile, Santiago, Chile.

ABSTRACT

Background: Femoroacetabular impingement (FAI) is the result of a mechanical conflict in the hip joint, and its diagnosis is based on clinical and radiological parameters. To our knowledge, there are no published studies describing the radiologic characteristics of FAI in Latin American populations.

Purpose: To describe the radiological features associated with FAI in an asymptomatic Chilean population.

Study design: Cross-sectional study; Level of evidence, 3.

Methods: We prospectively recruited asymptomatic patients with no history or symptoms of hip pathology who underwent abdomen-pelvis computed tomography (CT) for a nonorthopaedic indication. The acetabular and femoral parameters related to FAI were measured.

Results: We studied 101 subjects (202 hips) with a mean age of 36.8 ± 14.4 years. The mean center-edge angle was 39.4° ± 7.2°. The crossover sign was present in 34 cases (33.7%). The mean alpha angle was 49.7° ± 8.3°. Depending on the cut points chosen for FAI-related parameters, between 39.6% and 69.3% of an asymptomatic Chilean population were found to have morphological features related to FAI.

Conclusion: Our findings suggest that the proposed pathological threshold values in the literature cannot be extrapolated to a Chilean population, and this must be taken into consideration when evaluating Latin American patients with hip pain.

No MeSH data available.


Related in: MedlinePlus