Document Detail


Constraints in posterior-stabilised TKA kinematics: a comparison of two generations of an implant.
MedLine Citation:
PMID:  23052124     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: This study tests the hypothesis that the design changes incorporated in the newer generation Triathlon posterior-stabilised TKA design result in kinematics that more closely reproduce the kinematics observed in healthy knees than those achieved by the older generation Scorpio posterior-stabilised TKA design. METHODS: Eleven patients with Triathlon posterior-stabilised TKA, twelve patients with Scorpio posterior-stabilised TKA, and 22 subjects with normal asymptomatic knees underwent fluoroscopic assessment of the knee during a step-up exercise and a weight-bearing deep knee bend. Two-dimensional and three-dimensional knee kinematics were assessed including the maximum flexion, the patella tendon angle (PTA), the patella flexion angle (PFA), the minimum distance between cam and post, and the tibio-femoral contact positions. RESULTS: The average maximum flexion achieved was 114° (SD 3°), 91° (SD 10°), and 143° (SD 14°) for the Triathlon, Scorpio, and Normal groups. The average cam/post mechanism engagement was at 63° (SD 24°) and 82° (SD 16°) for the Triathlon and Scorpio groups. The condylar contact points showed a paradoxical anterior slide for the Scorpio group which was not present in the Triathlon group. The PTA and PFA values of both implants showed significant differences from normal. CONCLUSION: Overall, the Triathlon implant design, as compared to Scorpio TKA, produced kinematics closer to that of normal knees as proposed by the hypothesis. However, despite being closer to normal, the kinematics exhibited by the Triathlon group were still different from normal. A comparison of kinematic performance, taking into account altered design parameters, will contribute to improved understanding and future design considerations. LEVEL OF EVIDENCE: Case-control study, retrospective, comparative study, Level III.
Authors:
Hemant Pandit; Bernard Hendrik van Duren; M Price; S Tilley; Harinderjit Singh Gill; Neil P Thomas; David W Murray
Related Documents :
21214364 - Dentin surface modification using the er,cr:ysgg laser and a meshwork mask: light and s...
23475694 - Incidence and predictors of permanent pacemaker implantation following transcatheter ao...
23912364 - Totally implantable central venous catheters for chemotherapy: experience with 793 pati...
1883164 - Methylmethacrylate implants: a scanning electron microscopic study.
9287064 - The effects of different tetracyclines on the dentin root surface of instrumented, peri...
11299834 - Nuclear volume and breast cancer prognosis.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-11
Journal Detail:
Title:  Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA     Volume:  -     ISSN:  1433-7347     ISO Abbreviation:  Knee Surg Sports Traumatol Arthrosc     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9314730     Medline TA:  Knee Surg Sports Traumatol Arthrosc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences (NDORMS) Nuffield Orthopaedic Centre (NOC), University of Oxford, Headington, Oxford, UK.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

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


Previous Document:  Treatment of a hip capsular injury in a professional soccer player with platelet-rich plasma and bon...
Next Document:  Arthroscopic single-bundle ACL reconstruction with modified double-layer bone-patellar tendon-bone a...