Abstract
Background
Experimental disruption of the labrum has been shown to compromise its sealing function and alter cartilage lubrication. However, it is not known whether pathological changes to the labrum secondary to femoroacetabular impingement (FAI) have a similar impact on labral function.
Questions/purposes
Does damage to the labrum occurring in association with abnormal femoral morphology affect the labral seal?
Methods
Using 10 fresh cadaveric specimens (mean age 50 years, ± 8), we measured the capacity of the central compartment of the hip (the iliofemoral joint) to maintain a seal during fluid infusion, which may help elucidate the function of the labrum during weightbearing. Specimens with and without abnormal femoral morphology (six normal-appearing specimens and four whose geometry suggested cam-type FAI) were tested in postures observed during functional activities, including simulations of normal gait, stooping, and pivoting. Each specimen with FAI morphology exhibited secondary damage of the labrum and the adjacent chondral surface, whereas specimens of normal morphology were undamaged.
Results
Average peak central compartment pressure was reduced during pivoting for specimens with the presence of labral damage secondary to FAI. When placed in pivoting positions, hips with FAI maintained lower fluid pressures within the central compartment compared with intact specimens (15 ± 3 versus 42 ± 8 kPa, respectively; effect size: 1.08 [−0.36 to 2.31]; p = 0.007). No differences in peak pressure were observed between groups (FAI versus normal) for postures simulating either gait (21 ± 6 versus 22 ± 4 kPa; p = 0.902) or stooping (9 ± 2 versus 8 ± 3 kPa; p = 0.775) with the numbers available.
Conclusions
The acetabular seal, quantified by the maximum intraarticular pressure, was reduced during pivoting; however, the seal was maintained during simulated gait and stooping.
Clinical Relevance
Because degeneration is progressive with repetitive impingement, loss of the labral seal starts to be seen during pivoting and may progress from there, but in this small-sample cadaver study that evaluated specimens in middle adulthood, the seal remains intact during simulated gait and stooping. Our study suggests that labral damage secondary to cam-type FAI may reduce the ability of the labral to provide an adequate seal of the central compartment of the hip during loading; however, the extent to which this is affected requires further investigation.
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References
Anderson SE, Siebenrock KA, Mamisch TC, Tannast M. Femoroacetabular impingement magnetic resonance imaging. Top Magn Reson Imaging. 2009;20:123–128.
Cadet ER, Chan AK, Vorys GC, Gardner T, Yin B. Investigation of the preservation of the fluid seal effect in the repaired, partially resected, and reconstructed acetabular labrum in a cadaveric hip model. Am J Sports Med. 2012;40:2218–2223.
Crawford MJ, Dy CJ, Alexander JW, Thompson MT, Schroder S, Vega C, Patel R, Miller A, McCarthy JC, Lowe W, Noble P. The biomechanics of the hip labrum and the stability of the hip. Clin Orthop Relat Res. 2007;465:16–22.
Dwyer M, Jones H, Hogen M, Field RE, McCarthy J, Noble PC. The acetabular labrum regulates fluid circulation of the hip joint during functional activities. Am J Sports Med. 2014;42:812–819.
Ferguson SJ, Bryant JT, Ganz R, Ito K. The acetabular labrum seal: a poroelastic finite element model. Clin Biomech. 2000;15:463–468.
Ferguson SJ, Bryant JT, Ganz R, Ito K. The influence of the acetabular labrum on hip joint cartilage consolidation: a poroelastic finite element model. J Biomech. 2000;33:953–960.
Ferguson SJ, Bryant JT, Ganz R, Ito K. An in vitro investigation of the acetabular labral seal in hip joint mechanics. J Biomech. 2003;36:171–178.
Field RE, Rajakulendran K. The labro-acetabular complex. J Bone Joint Surg Am. 2011;93(Suppl 2):22–27.
Ganz R, Parvizi J, Beck M, Leunig M, Notzli H, Siebenrock K. Femoroacetabular impingement: a cause for osteoarthritis of the hip. Clin Orthop Relat Res. 2003;417:112–120.
Greaves LL, Gilbart MK, Yung AC, Kozlowski P, Wilson DR. Effect of acetabular labral tears, repair and resection on hip cartilage strain: a 7T MR study. J Biomech. 2010;43:858–863.
McCarthy JC, Noble P, Aluisio FV, Schuck M, Wright J, Lee J-A. Anatomy, pathologic features, and treatment of acetabular labral tears. Clin Orthop Relat Res. 2003;406:38–47.
McCarthy JC, Noble P, Schuck M, Wright J, Lee J-A. The role of labral lesions to development of early degenerative hip disease. Clin Orthop Relat Res. 2001;393:25–37.
McCarthy JC, Noble P, Schuck M, Wright J, Lee JL. The watershed labral lesion: it’s relationship to early arthritis of the hip. J Arthroplasty. 2001;16:81–87.
Nadzadi M, Pedersen D, Yack H, Callaghan JJ, Brown T. Kinematics, kinetics, and finite element analysis of commonplace maneuvers at risk for total hip dislocation. J Biomech. 2003;36:577–591.
Orthoload. Available at: http://www.orthoload.com. Accessed May 5, 2012.
Safran MR, Giordano G, Lindsey DP, Gold GE, Rosenberg J, Zaffagnini S, Giori NJ. Strains across the acetabular labrum during hip motion: a cadaveric model. Am J Sports Med. 2011;39:92S–102S.
Seldes RM, Tan V, Hunt J, Katz M, Winiarsky R, Fitzgerald RH. Anatomy, histologic features, and vascularity of the adult acetabular labrum. Clin Orthop Relat Res. 2001;382:232–240.
Stelzeneder D, Hingsammer A, Bixby SD, Kim YJ. Can radiographic morphometric parameters for the hip be assessed on MRI? Clin Orthop Relat Res. 2013;471:989–999.
Stelzeneder D, Mamisch TC, Kress I, Domayer SE, Werlen S, Bixby SD, Millis MB, Kim YJ. Patterns of joint damage seen on MRI in early hip osteoarthritis due to structural hip deformities. Osteoarthritis Cartilage. 2012;20:661–669.
Tamura S, Nishii T, Takao M, Sakai T, Yoshikawa H, Sugano N. Differences in the locations and modes of labral tearing between dysplastic hips and those with femoroacetabular impingement. Bone Joint J. 2013;95:1320–1325.
Tannast M, Goricki D, Beck M, Murphy SB, Siebenrock KA. Hip damage occurs at the zone of femoroacetabular impingement. Clin Orthop Relat Res. 2008;466:273–280.
Won Y-Y, Chung I, Chung N, Song K. Morphological study on the acetabular labrum. Yonsei Med J. 2003;44:855–862.
Wu J, Herzog W, Epstein M. Joint contact mechanics in the early stages of osteoarthritis. Med Eng Phys. 2000;22:1–12.
Acknowledgments
We acknowledge Mr Michael Hogen, Mr Stephen Wallace, and Mr Andrew Moorman for their assistance with data collection and specimen dissection; Mr Jerry Alexander for his assistance in acquiring specimens; and Mr Sabir Ismaily for his assistance with capturing the motion analysis data.
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This work was performed at the Institute of Orthopedic Research and Education, Houston, TX, USA.
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Dwyer, M.K., Jones, H.L., Field, R.E. et al. Femoroacetabular Impingement Negates the Acetabular Labral Seal During Pivoting Maneuvers but Not Gait. Clin Orthop Relat Res 473, 602–607 (2015). https://doi.org/10.1007/s11999-014-3760-1
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DOI: https://doi.org/10.1007/s11999-014-3760-1