Document Detail

Pre-operative frontal plane malalignment predicts the extension gap asymmetry in knee osteoarthritis.
MedLine Citation:
PMID:  21674289     Owner:  NLM     Status:  MEDLINE    
PURPOSE: In contrast to bone cuts, soft-tissue releases cannot be planned sufficiently prior to total knee arthroplasty (TKA). Intra-operative evaluation of the extension gap after tibial or femoral resection may result in an unnecessarily excessive bone resection. The present study examines whether extension gap asymmetry can be calculated from the pre-operative long standing X-ray.
METHODS: In this retrospective study, 32 patients with navigated unconstrained TKA were included. The pre-operative malalignment was measured on long standing X-rays and compared with the extension gap asymmetry that was documented by the navigation system intra-operatively.
RESULTS: The mean pre-operative malalignment was 9.8° (20° valgus to 14.8° varus). The intra-operatively measured extension gap showed a mean asymmetry of 3.4 ± 2.4 mm. Both correlated following the equation: asymmetry [mm] = 0.35 * malalignment [°] (R = 0.855, P < 0.001).
CONCLUSIONS: We recommend planning the intra-operative release and tibial bone cut using long standing X-rays.
Georg Matziolis; Doerte Matziolis; Carsten Perka
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Publication Detail:
Type:  Journal Article     Date:  2011-06-15
Journal Detail:
Title:  International orthopaedics     Volume:  36     ISSN:  1432-5195     ISO Abbreviation:  Int Orthop     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-01-05     Completed Date:  2012-05-03     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  7705431     Medline TA:  Int Orthop     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  79-82     Citation Subset:  IM    
Orthopedic Department, Center for Musculoskeletal Surgery, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany.
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MeSH Terms
Arthroplasty, Replacement, Knee / adverse effects,  methods*
Bone Malalignment / diagnosis*,  physiopathology,  surgery
Femur / pathology,  radiography,  surgery
Knee Joint / pathology*,  radiography,  surgery
Observer Variation
Osteoarthritis, Knee / diagnosis*,  physiopathology,  surgery
Postoperative Complications
Preoperative Period*
Range of Motion, Articular
Retrospective Studies
Tibia / pathology,  radiography,  surgery

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

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