Document Detail

Does minimally invasive total knee arthroplasty improve isokinetic torque?
MedLine Citation:
PMID:  22903286     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Less invasive dissection of the extensor apparatus, one of the aspects of minimally invasive surgical (MIS) TKA, might result in less reduction of postoperative quadriceps strength. However, it is unclear whether MIS is associated with less strength reduction.
QUESTIONS/PURPOSES: We asked whether knee strength (extensor or flexor torque) would be greater in patients having a MIS TKA compared with patients having a standard TKA and whether knee scores, alignment, ROM, tourniquet and operating times, and hospital length of stay were improved.
METHODS: We prospectively recruited 52 patients awaiting MIS or standard TKA, matched for age, weight, height, BMI, sex, and surgically treated side, but not randomized. Isokinetic tests were performed preoperatively and postoperatively to obtain peak values of extensor and flexor torque. Postoperative-to-preoperative ratios and the extensor-flexor torque ratio also were calculated.
RESULTS: Mean baseline extensor torques were 57 Nm and 53 Nm for MIS and standard TKAs, respectively. At 8 weeks postoperatively, absolute values of the mean postoperative knee extensor torque also were similar: 47 and 45 Nm for patients with MIS and standard TKAs, respectively. The postoperative-to-preoperative ratios were 0.8 for extensor and flexor torque in both groups. The extensor-flexor torque ratios were similar between groups.
CONCLUSIONS: Our data suggest a less invasive dissection of the extensor apparatus involved in MIS TKA does not enhance postoperative quadriceps strength.
LEVEL OF EVIDENCE: Level III, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.
Michael C Liebensteiner; Martin Krismer; Arnold Koller; Barbara Semenitz; Eckart Mayr
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Publication Detail:
Type:  Clinical Trial; Journal Article     Date:  2012-08-18
Journal Detail:
Title:  Clinical orthopaedics and related research     Volume:  470     ISSN:  1528-1132     ISO Abbreviation:  Clin. Orthop. Relat. Res.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-10-11     Completed Date:  2013-01-03     Revised Date:  2013-11-05    
Medline Journal Info:
Nlm Unique ID:  0075674     Medline TA:  Clin Orthop Relat Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3233-9     Citation Subset:  AIM; IM    
Department of Orthopaedic Surgery, Innsbruck Medical University, Anichstrasse 35, 6020 Innsbruck, Austria.
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MeSH Terms
Arthroplasty, Replacement, Knee*
Joint Diseases / surgery*
Knee Joint / physiology*,  surgery*
Middle Aged
Surgical Procedures, Minimally Invasive*

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

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