Abstract
Purpose
Determination of the cup orientation after metal-on-metal hip resurfacing may provide important information in the postoperative follow-up. We present a mathematical method based on a previously described approach to assess the version and inclination of the cup in the metal-on-metal bearing without a separate software computation from plain radiographs. The aim of the study was to assess the intra- and inter-observer reliability of this method.
Methods
Calculation of version and inclination were done twice for 20 hip resurfacings by four observers. Intra-observer reliability was estimated by mean error and correlation of the two sets of measurement for version and inclination. Bland-Altman plots, intra-class coefficient and mean error were used to assess the inter-observer reliability of the measurements.
Results
Intra-observer correlation for version measurement ranged from 0.74 to 0.94. Correlation for inclination varied between 0.94 and 0.97. Upper and lower limits of agreement in Bland-Altman plots for version measurements between observers ranged from 4.1 to 7.2 degrees and from −3.2 to −8.3 degrees, respectively. For inclination measurements the upper and lower limits ranged from 3.1 to 5.3 degrees and from −2.7 to −6.0 degrees.
Conclusions
Mean errors, correlation coefficients and 95% limits of agreement were on an acceptable level. We believe that this method is applicable for clinical use.
Similar content being viewed by others
References
Malik A, Maheshwari A, Dorr LD (2007) Impingement with total hip replacement. J Bone J Surg [Am] 89:1832–1842
Triclot P (2011) Metal-on-metal: history, state of the art (2010). Int Orthop 35:201–206
De Haan R, Pattyn C, Gill HS, Murray DW, Campbell PA, De Smet K (2008) Correlation between inclination of the acetabular component and metal ion levels in metal-on-metal hip resurfacing replacement. J Bone J Surg [Br] 90:1291–1297
Langton DJ, Jameson SS, Joyce TJ, Webb J, Nargol AV (2008) The effect of component size and orientation on the concentrations of metal ions after resurfacing arthroplasty of the hip. J Bone J Surg [Br] 90:1143–1151
Widmer KH (2004) A simplified method to determine acetabular cup anteversion from plain radiographs. J Arthroplasty 19:387–390
Pradhan R (1999) Planar anteversion of the acetabular cup as determined from plain anteroposterior radiographs. J Bone J Surg [Br] 81:431–435
Fabeck L, Farrokh D, Tolley M, Descamps PY, Gebhart M, Delince P (1999) A method to measure acetabular cup anteversion after total hip replacement. Acta Orthop Belg 65:485–491
Ackland MK, Bourne WB, Uhthoff HK (1986) Anteversion of the acetabular cup. Measurement of angle after total hip replacement. J Bone J Surg [Br] 68:409–413
Liaw CK, Hou SM, Yang RS, Wu TY, Fuh CS (2006) A new tool for measuring cup orientation in total hip arthroplasties from plain radiographs. Clin Orthop 451:134–139
Seradge H, Nagle KR, Miller RJ (1982) Analysis of version in the acetabular cup. Clin Orthop 166:152–157
Hassan DM, Johnston GH, Dust WN, Watson LG, Cassidy D (1995) Radiographic calculation of anteversion in acetabular prostheses. J Arthroplasty 10:369–372
Malviya A, Lingard EA, Malik A, Bowman R, Holland JP (2010) Hip flexion after Birmingham hip resurfacing: role of cup anteversion, anterior femoral head-neck offset, and head-neck ratio. J Arthroplasty 25:387–391
Langton DJ, Sprowson AP, Joyce TJ, Reed M, Carluke I, Partington P, Nargol AV (2009) Blood metal ion concentrations after hip resurfacing arthroplasty: a comparative study of articular surface replacement and Birmingham hip resurfacing arthroplasties. JBJS [Br] 91:1287–1295
Langton DJ, Sprowson AP, Mahadeva D, Bhatnagar S, Holland JP, Nargol AV (2010) Cup anteversion in hip resurfacing: validation of EBRA and the presentation of a simple clinical grading system. J Arthroplasty 25:607–613
De Haan R, Campbell PA, Su EP, De Smet KA (2008) Revision of metal-on-metal resurfacing arthroplasty of the hip: the influence of malpositioning of the components. J Bone J Surg [Br] 90:1158
Ball ST, Schmalzried TP (2009) Posterior femoroacetabular impingement (PFAI) after hip resurfacing arthroplasty. Bull NYU Hosp Jt Dis 67:173–176
Yao L, Yao J, Gold RH (1995) Measurement of acetabular version on the axiolateral radiograph. Clin Orthop 316:106–111
Reito A, Puolakka T, Pajamäki J (2010) Birmingham hip resurfacing: five to eight year results. Int Orthop. doi:10.1007/s00264-010-1066-9, 19 June 2010 [Epub ahead of print]
Bland JM, Altman DG (1986) Statistical methods for assessing agreement between two methods of clinical measurement. Lancet 8476:307–310
McKibbin B (1970) Anatomical factors in the stability of the hip joint in the newborn. JBJS [Br] 52:148–159
Haenle M, Heitner A, Mittelmeier W, Barbano R, Scholz R, Steinhauser E, Bader R (2007) Assessment of cup position from plain radiographs: impact of pelvic tilting. Surg Radiol Anat 29:29–35
Derbyshire B (2008) Correction of acetabular cup orientation measurements for X-ray beam offset. Med Eng Phys 30:1119–1126
Marx A, von Knoch M, Pfortner J, Wiese M, Saxler G (2006) Misinterpretation of cup anteversion in total hip arthroplasty using planar radiography. Arch Orthop Trauma Surg 126:487–492
Mayr E, Kessler O, Prassl A, Rachbauer F, Krismer M, Nogler M (2005) The frontal pelvic plane provides a valid reference system for implantation of the acetabular cup: spatial orientation of the pelvis in different positions. Acta Orthop 76:848–853
Murray DW (1993) The definition and measurement of acetabular orientation. J Bone J Surg [Br] 75:228–232
Ghelman B, Kepler CK, Lyman S, Della Valle AG (2009) CT outperforms radiography for determination of acetabular cup version after THA. Clin Orthop 467:2362–2370
Kalteis T, Handel M, Herold T, Perlick L, Paetzel C, Grifka J (2006) Position of the acetabular cup—accuracy of radiographic calculation compared to CT-based measurement. Eur J Radiol 58:294–300
Olivecrona H, Weidenhielm L, Olivecrona L, Beckman MO, Stark A, Noz ME, Maguire GQ Jr, Zeleznik MP, Svensson L, Jonson T (2004) A new CT method for measuring cup orientation after total hip arthroplasty: a study of 10 patients. Acta Orthop Scand 75:252–260
Tannast M, Murphy SB, Langlotz F, Anderson SE, Siebenrock KA (2006) Estimation of pelvic tilt on anteroposterior X-rays—a comparison of six parameters. Skeletal Radiol 35:149–155
Eddine TA, Migaud H, Chantelot C, Cotten A, Fontaine C, Duquennoy A (2001) Variations of pelvic anteversion in the lying and standing positions: analysis of 24 control subjects and implications for CT measurement of position of a prosthetic cup. Surg Radiol Anat 23:105–110
Shimmin A (2010) The influence of the size of the component on the outcome of resurfacing arthroplasty of the hip. J Bone J Surg [Br] 92:469–476
Conflict of interest
The authors declare that they have no conflict of interest.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Reito, A., Puolakka, T., Paakkala, A. et al. Assessment of inter- and intra-observer reliability in the determination of radiographic version and inclination of the cup in metal-on-metal hip resurfacing. International Orthopaedics (SICOT) 36, 519–525 (2012). https://doi.org/10.1007/s00264-011-1328-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00264-011-1328-1