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Characterization of Human Anterosuperior Acetabular Depression in Correlation With Labral Tears.

Kopydlowski NJ, Tannenbaum EP, Smith MV, Sekiya JK - Orthop J Sports Med (2014)

Bottom Line: The psoas valley was observed in every specimen and was located in the anterosuperior quadrant of the acetabulum.Its depth was significantly greater (P < .001) in males (5.35 ± 1.60 mm) than in females (3.95 ± 1.31 mm).The differences observed in the study data are believed to be a result of the different anatomic morphologies of the pelvis in males and females.

View Article: PubMed Central - PubMed

Affiliation: University of Michigan Medical School, Ann Arbor, Michigan, USA.

ABSTRACT

Background: Labral tears often occur in the same quadrant of the acetabulum at a small depression previously referred to as the psoas valley. Understanding the anatomic variations of this depression could help us understand the etiology of labral tears.

Purpose: To describe the location and dimensions of the depression located in the anterosuperior acetabular rim. The hypothesis was that the location of this depression would be consistent with the common location of acetabular labral tears described in the literature.

Study design: Controlled laboratory study.

Methods: A total of 240 pelvic specimens were divided into 2 groups (n = 120 for each) according to age (younger age group: 21.36 ± 3.12 years [range, 14-24 years]; older age group: 42.30 ± 10.27 years, [range, 25-60 years]).Specimens were also categorized based on sex (mean age: 31.93 ± 12.31 years [male]; 32.08 ± 13.66 years [female]) and race (mean age: 31.45 ± 13.16 years [black]; 32.57 ± 12.82 years [white]). The depth and width of the acetabular depression were measured using a digital caliper, and the location was measured using a goniometer.

Results: The psoas valley was observed in every specimen and was located in the anterosuperior quadrant of the acetabulum. Its depth was significantly greater (P < .001) in males (5.35 ± 1.60 mm) than in females (3.95 ± 1.31 mm). The width of the psoas valley was also greater (P < .001) in males (29.39 ± 3.98 mm) than in females (24.49 ± 4.80 mm). There were no differences in size or location of the depression between races or age groups. The psoas valley was located between 3.92 ± 0.42 o'clock anteriorly and 2.12 ± 0.77 o'clock posteriorly.

Conclusion: The differences observed in the study data are believed to be a result of the different anatomic morphologies of the pelvis in males and females. This loss of bony support, caused by the depression, could be the underlying cause of weakening of the acetabular labrum as people age.

Clinical relevance: The loss of bony support in the anterosuperior acetabular depression could contribute to the labral tears that commonly occur in this area. Understanding the normal anatomy of this area could be important in determining the risk of labral tears as well as treatment options.

No MeSH data available.


Related in: MedlinePlus

Measurement process, as shown from the superior aspect of the right acetabulum. Depth of the psoas valley was measured using a digital caliper. The depth was defined as the distance between the ruler and the deepest point of the valley. The width was defined as the distance between the 2 peaks on each side of the valley.
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fig1-2325967114551328: Measurement process, as shown from the superior aspect of the right acetabulum. Depth of the psoas valley was measured using a digital caliper. The depth was defined as the distance between the ruler and the deepest point of the valley. The width was defined as the distance between the 2 peaks on each side of the valley.

Mentions: The depth of the psoas valley was measured using a 6-inch digital caliper. Electronic digital calipers were used to take advantage of the unique ex vivo samples that were available for this study. This unique technique was used to compare physical ex vivo measurements to measurements taken from radiographs and magnetic resonance imaging techniques present in the literature. A ruler was placed lateral to the 2 bony peaks that border the psoas valley on the acetabular rim, and the digital caliper was used to measure the depth and width of recession of the acetabular rim (Figure 1). The measurements were completed multiple times, and the depth and width recorded were a mean of all measurements performed.


Characterization of Human Anterosuperior Acetabular Depression in Correlation With Labral Tears.

Kopydlowski NJ, Tannenbaum EP, Smith MV, Sekiya JK - Orthop J Sports Med (2014)

Measurement process, as shown from the superior aspect of the right acetabulum. Depth of the psoas valley was measured using a digital caliper. The depth was defined as the distance between the ruler and the deepest point of the valley. The width was defined as the distance between the 2 peaks on each side of the valley.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2 - License 3
Show All Figures
getmorefigures.php?uid=PMC4555548&req=5

fig1-2325967114551328: Measurement process, as shown from the superior aspect of the right acetabulum. Depth of the psoas valley was measured using a digital caliper. The depth was defined as the distance between the ruler and the deepest point of the valley. The width was defined as the distance between the 2 peaks on each side of the valley.
Mentions: The depth of the psoas valley was measured using a 6-inch digital caliper. Electronic digital calipers were used to take advantage of the unique ex vivo samples that were available for this study. This unique technique was used to compare physical ex vivo measurements to measurements taken from radiographs and magnetic resonance imaging techniques present in the literature. A ruler was placed lateral to the 2 bony peaks that border the psoas valley on the acetabular rim, and the digital caliper was used to measure the depth and width of recession of the acetabular rim (Figure 1). The measurements were completed multiple times, and the depth and width recorded were a mean of all measurements performed.

Bottom Line: The psoas valley was observed in every specimen and was located in the anterosuperior quadrant of the acetabulum.Its depth was significantly greater (P < .001) in males (5.35 ± 1.60 mm) than in females (3.95 ± 1.31 mm).The differences observed in the study data are believed to be a result of the different anatomic morphologies of the pelvis in males and females.

View Article: PubMed Central - PubMed

Affiliation: University of Michigan Medical School, Ann Arbor, Michigan, USA.

ABSTRACT

Background: Labral tears often occur in the same quadrant of the acetabulum at a small depression previously referred to as the psoas valley. Understanding the anatomic variations of this depression could help us understand the etiology of labral tears.

Purpose: To describe the location and dimensions of the depression located in the anterosuperior acetabular rim. The hypothesis was that the location of this depression would be consistent with the common location of acetabular labral tears described in the literature.

Study design: Controlled laboratory study.

Methods: A total of 240 pelvic specimens were divided into 2 groups (n = 120 for each) according to age (younger age group: 21.36 ± 3.12 years [range, 14-24 years]; older age group: 42.30 ± 10.27 years, [range, 25-60 years]).Specimens were also categorized based on sex (mean age: 31.93 ± 12.31 years [male]; 32.08 ± 13.66 years [female]) and race (mean age: 31.45 ± 13.16 years [black]; 32.57 ± 12.82 years [white]). The depth and width of the acetabular depression were measured using a digital caliper, and the location was measured using a goniometer.

Results: The psoas valley was observed in every specimen and was located in the anterosuperior quadrant of the acetabulum. Its depth was significantly greater (P < .001) in males (5.35 ± 1.60 mm) than in females (3.95 ± 1.31 mm). The width of the psoas valley was also greater (P < .001) in males (29.39 ± 3.98 mm) than in females (24.49 ± 4.80 mm). There were no differences in size or location of the depression between races or age groups. The psoas valley was located between 3.92 ± 0.42 o'clock anteriorly and 2.12 ± 0.77 o'clock posteriorly.

Conclusion: The differences observed in the study data are believed to be a result of the different anatomic morphologies of the pelvis in males and females. This loss of bony support, caused by the depression, could be the underlying cause of weakening of the acetabular labrum as people age.

Clinical relevance: The loss of bony support in the anterosuperior acetabular depression could contribute to the labral tears that commonly occur in this area. Understanding the normal anatomy of this area could be important in determining the risk of labral tears as well as treatment options.

No MeSH data available.


Related in: MedlinePlus