Arthroscopy: The Journal of Arthroscopic & Related Surgery
Original ArticleAcetabular Rim Reduction for the Treatment of Femoroacetabular Impingement Correlates With Preoperative and Postoperative Center-Edge Angle
Section snippets
Methods
Between August 2007 and April 2008, 58 patients were prospectively enrolled in this institutional review board–approved study. Patients presented for the treatment of debilitating hip pain. The mean age at the time of arthroscopy was 32 years (range, 18 to 61 years). There were 23 men and 35 women. There were 22 left hips and 36 right hips. The mean body mass index was 23 (range, 18 to 32).
Inclusion criteria were hip arthroscopy for the treatment of FAI and rim reduction at the time of hip
Results
The mean preoperative CE angle was 36.4° (range, 25° to 51°) for observer 1. For observer 2, the mean preoperative CE angle was 36.7° (range, 22° to 51°). The mean postoperative CE angle was 32.3° (range, 23° to 49°) for observer 1. For observer 2, the mean postoperative CE angle was 33.1° (range, 22° to 44°). The interobserver intraclass correlation coefficient for radiographic measurement of the CE angle was 0.92 (95% confidence interval, 0.87 to 0.95), indicating excellent interobserver
Discussion
This study showed that the change in CE angle could be estimated from millimeters of acetabular bony resection. Furthermore, this study showed that the CE angle is a reliable measurement with excellent inter-rater reliability as a radiographic diagnostic tool for the measurement of acetabular coverage.
Although CE angle is not a perfect means of assessing acetabular coverage, there is certainly a range below which the hip is at a higher risk of developing osteoarthritis, labral tears, and even
Conclusions
The findings of this study showed that the amount of change in the CE angle can be estimated by the amount of bony resection performed at the 12-o'clock position on the lunate surface in the arthroscopic treatment of femoroacetabular pincer impingement. We found that 1 mm of bony resection equals 2.4° of change in the CE angle and 5 mm of bony resection equals 5° of change in the CE angle. The following formula can be used: Change in CE angle = 1.8 + (0.64 × rim reduction in millimeters).
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2021, Clinical ImagingCitation Excerpt :Preoperative planning is reliant upon two-dimensional (2D) radiologic parameters such as alpha angle, lateral center edge (LCE) angle, femoral version, and acetabular version [4]. Although these measurements help to inform the amount and location of the osteoplasty that will be performed in FAI patients, there are no specific criteria that can be met to ensure restoration of physiologic range of motion (ROM) [5–9]. These static measurements alone may therefore not provide adequate characterization of FAI, particularly when considering that impingement is a dynamic process related to an interplay between all of them [8].
Hip Arthroscopy and Borderline Developmental Dysplasia of the Hip: A Systematic Review
2020, Arthroscopy - Journal of Arthroscopic and Related SurgeryCitation Excerpt :Further evaluation of the definition of BDDH, such as sagittal evaluation, is also necessary. In patients with BDDH, as for the amount of rim recession for acetabuloplasty, Fukui et al.28 mentioned that the amount of recession was determined by referring to the relationship between the change in degrees in the LCEA and the amount of acetabular rim recessed (Change in LCEA =1.8 + 0.64 × rim reduction in millimeters) previously reported by the same research group.55 In contrast, Chandrasekaran et al.24 suggested that the rim recession should be limited to 2 mm.
Arthroscopic Treatment of Subspine (Anterior-Inferior Iliac Spine) Impingement
2020, Operative Techniques in OrthopaedicsCitation Excerpt :If so, a pincer lesion resection should be done. The preoperative center-edge angle aids in this decision making process.15 The typical pincer resection required is approximately 3-5 mm.13
Recipient of the 2009 Arthroscopy Association of North America Fellows Essay Award.
Supported by Smith & Nephew, Andover, MA.