Document Detail

Position of the prosthesis components in total ankle replacement and the effect on motion at the replaced joint.
MedLine Citation:
PMID:  21789498     Owner:  NLM     Status:  MEDLINE    
PURPOSE: In some cases of total ankle replacement, perfect alignment of the prosthetic components is not achieved. This study analyses the extent to which component positioning is critical for the final range of motion.
METHODS: Fourteen patients undergoing total ankle replacement were assessed preoperatively and postoperatively at seven and 13 months follow-up. X-ray pictures of the ankle were taken in static double leg stance, i.e. at neutral joint position, and in maximum plantarflexion and dorsiflexion. Measurements were obtained by a specially devised computer program based on anatomical reference points digitised on the radiograms. These allowed calculation of the position and orientation of the components in the sagittal and coronal planes, together with the joint range of motion.
RESULTS: The mean range of motion was about 34 degrees at the first follow-up and maintained at the second. Tibial and talar components were more anterior than the mid-tibial shaft in 11 and nine patients, respectively. Mean inclination was about four degrees posterior for the tibial component and nearly one degree anterior for the talar component. A significantly larger range of motion was found in ankles both with the talar component located and inclined more anteriorly than the tibial.
CONCLUSIONS: Correlation, though weak, was found between motion at the replaced ankle and possible residual subluxation and inclination of the components. However, a satisfactory range of motion was also achieved in those patients where recommended locations for the components could not be reached because of the size of the original joint deformity.
Francesco Cenni; Alberto Leardini; Andrea Cheli; Fabio Catani; Claudio Belvedere; Matteo Romagnoli; Sandro Giannini
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Publication Detail:
Type:  Journal Article     Date:  2011-07-26
Journal Detail:
Title:  International orthopaedics     Volume:  36     ISSN:  1432-5195     ISO Abbreviation:  Int Orthop     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-03-02     Completed Date:  2012-07-20     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  7705431     Medline TA:  Int Orthop     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  571-8     Citation Subset:  IM    
Movement Analysis Laboratory, Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136, Bologna, Italy.
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MeSH Terms
Ankle Injuries / surgery
Ankle Joint / physiopathology,  radiography,  surgery*
Arthritis, Rheumatoid / surgery
Arthroplasty, Replacement, Ankle / adverse effects,  instrumentation,  methods*
Bone Malalignment / etiology,  radiography
Joint Instability / etiology,  radiography
Middle Aged
Osteoarthritis / surgery
Postoperative Complications
Prosthesis Fitting / adverse effects,  methods*
Range of Motion, Articular

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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