Lateral Center-Edge Angle Is Not Predictive of Acetabular Articular Cartilage Surface Area: Anatomic Variation of the Lunate Fossa.
The American journal of sports medicine
BACKGROUND: Surgical treatment of symptomatic femoroacetabular impingement (FAI) and dysplasia requires careful characterization of acetabular morphology. The lateral center-edge angle (LCEA) is often used to assess lateral acetabular anatomy. Previous work has questioned the LCEA as a surrogate for acetabular contact/articular cartilage surface area because of the variable morphology of the lunate fossa.
HYPOTHESIS: We hypothesized that weightbearing articular cartilage of the acetabulum would poorly correlate with LCEA secondary to significant variation in the size of the lunate fossa.
STUDY DESIGN: Cohort study (Diagnosis); Level of evidence, 3.
METHODS: Patients with 3D CT imaging undergoing either hip arthroscopy or periacetabular osteotomy for FAI or symptomatic hip instability were retrospectively identified. The LCEA and femoral head diameter were measured on an anteroposterior pelvis radiograph. Patients were grouped according to their lateral acetabular coverage as undercoverage (LCEA,40°). Patients were randomly identified until each group contained 20 patients. The articular surface area was measured from preoperative 3D CT data. Linear regression analysis was performed to examine the relationship between articular surface area and LCEA. Continuous and categorical data were analyzed utilizing analysis of variance and chi-square analysis. Statistical significance was set at
RESULTS: No difference in age (
CONCLUSION: Lateral acetabular undercoverage based on the LCEA (25°), however, is not predictive of increased, normal, or decreased acetabular surface area.
Trinh TQ, Leunig M, Larson CM, Clohisy J, Nepple J, Zaltz I, Kelly BT, Naimark MB, Bedi A. Lateral Center-Edge Angle Is Not Predictive of Acetabular Articular Cartilage Surface Area: Anatomic Variation of the Lunate Fossa. Am J Sports Med. 2020 Jul;48(8):1967-1973. doi: 10.1177/0363546520924038. Epub 2020 Jun 10. PMID: 32520593.