Identification of overlengthening after replacement of the radial head with a bipolar prosthesis
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Identification of overlengthening after replacement of the radial head with a bipolar prosthesis. / Wegmann, K; Lamsfuss, J; Ries, C; Neiss, W F; Franklin, J; Müller, L P; Burkhart, K J.
In: ARCH ORTHOP TRAUM SU, Vol. 135, No. 12, 12.2015, p. 1669-74.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Identification of overlengthening after replacement of the radial head with a bipolar prosthesis
AU - Wegmann, K
AU - Lamsfuss, J
AU - Ries, C
AU - Neiss, W F
AU - Franklin, J
AU - Müller, L P
AU - Burkhart, K J
PY - 2015/12
Y1 - 2015/12
N2 - INTRODUCTION: Overlengthening of the radial column leads to insufficient functionality and increased capitellar wear. Methods to detect or prevent overlengthening have been described for monopolar prostheses. The aim of this study was to evaluate whether one such method described by Athwal et al. is also applicable for a bipolar prosthesis.MATERIALS AND METHODS: The radial heads of six fresh frozen upper extremities were resected. A bipolar radial head prosthesis was implanted in each, and the effects of sequential overlengthening on the alignment of the radiocapitellar and ulnohumeral joint line were recorded by fluoroscopic images. Digital image analysis and estimation of overlengthening followed according to the method described by Athwal et al.RESULTS: Statistical analysis of the estimated and actual differences between the native state and bipolar replacement of the radial head with stepwise overlengthening of 1.5, 3, 4.5, and 6 mm showed a specificity of 86 % but consistently underestimated the amount of overlengthening with a sensitivity of only 61 %.DISCUSSION: The method described by Athwal et al. for the identification of overlengthening by a monopolar prosthesis was not found to be reliable for ruling out or quantifying overlengthening of the tested bipolar prosthesis. However, the use of the method to detect (rule in) overlengthening may be acceptable in certain circumstances. A reliable method for postoperative quantification of overlengthening by bipolar prostheses has still to be found.
AB - INTRODUCTION: Overlengthening of the radial column leads to insufficient functionality and increased capitellar wear. Methods to detect or prevent overlengthening have been described for monopolar prostheses. The aim of this study was to evaluate whether one such method described by Athwal et al. is also applicable for a bipolar prosthesis.MATERIALS AND METHODS: The radial heads of six fresh frozen upper extremities were resected. A bipolar radial head prosthesis was implanted in each, and the effects of sequential overlengthening on the alignment of the radiocapitellar and ulnohumeral joint line were recorded by fluoroscopic images. Digital image analysis and estimation of overlengthening followed according to the method described by Athwal et al.RESULTS: Statistical analysis of the estimated and actual differences between the native state and bipolar replacement of the radial head with stepwise overlengthening of 1.5, 3, 4.5, and 6 mm showed a specificity of 86 % but consistently underestimated the amount of overlengthening with a sensitivity of only 61 %.DISCUSSION: The method described by Athwal et al. for the identification of overlengthening by a monopolar prosthesis was not found to be reliable for ruling out or quantifying overlengthening of the tested bipolar prosthesis. However, the use of the method to detect (rule in) overlengthening may be acceptable in certain circumstances. A reliable method for postoperative quantification of overlengthening by bipolar prostheses has still to be found.
KW - Aged, 80 and over
KW - Cadaver
KW - Elbow Joint/injuries
KW - Elbow Prosthesis/adverse effects
KW - Female
KW - Follow-Up Studies
KW - Humans
KW - Intra-Articular Fractures/diagnosis
KW - Male
KW - Postoperative Complications/diagnosis
KW - Prosthesis Design
KW - Prosthesis Implantation/adverse effects
KW - Radius/injuries
KW - Radius Fractures/diagnosis
KW - Replantation
U2 - 10.1007/s00402-015-2333-4
DO - 10.1007/s00402-015-2333-4
M3 - SCORING: Journal article
C2 - 26450831
VL - 135
SP - 1669
EP - 1674
JO - ARCH ORTHOP TRAUM SU
JF - ARCH ORTHOP TRAUM SU
SN - 0936-8051
IS - 12
ER -