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Evaluation of cementless femoral stem level on mediolateral projection radiographs
Author(s) -
Burneko Marie,
Hudson Caleb C.,
Beale Brian S.
Publication year - 2020
Publication title -
veterinary surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 79
eISSN - 1532-950X
pISSN - 0161-3499
DOI - 10.1111/vsu.13427
Subject(s) - medicine , radiography , cadaveric spasm , cadaver , coronal plane , femur , sagittal plane , lesser trochanter , orthodontics , greater trochanter , anatomy , nuclear medicine , surgery
Objective To evaluate the accuracy of measuring cementless femoral stem level on mediolateral projection radiographs. Study design Benchtop cadaveric. Sample population Twelve canine cadaver femurs. Methods Cementless femoral stems were inserted into 12 canine cadaver femurs at three levels of subsidence. Mediolateral radiographs were obtained for each femur at 0°, 10°, and − 10° frontal plane angulation and at 0°, 15°, 30°, −15°, and − 30° axial plane rotation. Stem level was measured physically on specimens and on radiographs, and a proportion was used to calculate corrected stem level. Stem level was assessed relative to the greater trochanter and relative to the intertrochanteric fossa. Analysis of variance tests were used to compare actual, radiographically measured, and corrected stem level. Results No differences were detected between radiographically measured and actual stem level relative to the greater trochanter at 0°, 15°, 30°, and − 30° axial rotation with 0° frontal plane angulation; introduction of 10° or − 10° frontal plane angulation resulted in differences between radiographically measured and actual stem level. Errors >0.5 mm were observed in 82% of radiographic measurements on the basis of the intertrochanteric fossa. The use of a corrective proportion did not improve the accuracy of radiographic measurements. Conclusion Femoral stem level was accurately quantitated on mediolateral projection radiographs in this cadaver model. Frontal plane angulation distorted this measurement. Clinical significance Femoral stem subsidence may be assessed on well‐positioned mediolateral projection radiographs if the landmarks are visible.