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Association of Hip Dysplasia With Trochlear Dysplasia in Skeletally Mature Patients

Background: Developmental dysplasia of the hip (DDH) and trochlear dysplasia (TD) are distinct pathologies with several important features in common. In addition to shared risk factors, both forms of dysplasia cause abnormal joint kinematics and force transmission, predisposing patients to pain, inj...

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Bibliographic Details
Published in:Orthopaedic journal of sports medicine 2023-10, Vol.11 (10), p.23259671231200805-23259671231200805
Main Authors: Fithian, Andrew T., Richey, Ann E., Sherman, Seth L., Shea, Kevin G., Pun, Stephanie Y.
Format: Article
Language:English
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Summary:Background: Developmental dysplasia of the hip (DDH) and trochlear dysplasia (TD) are distinct pathologies with several important features in common. In addition to shared risk factors, both forms of dysplasia cause abnormal joint kinematics and force transmission, predisposing patients to pain, injuries to cartilage and soft tissue stabilizers, and ultimately arthritis. Purpose: To evaluate for an association between hip dysplasia and TD in skeletally mature patients with symptomatic hip dysplasia. Study Design: Cross-sectional study; Level of evidence, 3. Methods: A total of 48 patients with DDH who underwent periacetabular osteotomy were compared with 48 sex-matched patients who underwent hip arthroscopy for femoroacetabular impingement (FAI) between July 2014 and February 2021. All patients were skeletally mature. The Tönnis angle and lateral center-edge angle were measured on preoperative pelvis radiographs. Femoral version, trochlear depth, lateral trochlear inclination (LTI), tibial tubercle–trochlear groove distance (TTTG-d), and posterior lateral condylar angle (PLCA) were measured on preoperative magnetic resonance imaging scans of the symptomatic hip and ipsilateral knee. Continuous variables were compared between the patient groups using 2-sample t tests. Interobserver reliability was measured using the intraclass correlation coefficient. Results: Patients with DDH demonstrated a reduced trochlear depth compared with patients with FAI (3.6 vs 4.6 mm; P < .001). There were no differences between groups in femoral anteversion, LTI, TTTG-d, or PLCA. Two (4.2%) patients with FAI and 17 (35.4%) patients with DDH had a trochlear depth
ISSN:2325-9671
2325-9671
DOI:10.1177/23259671231200805