Journal Contents   |    
Mechanical Function of the Patella
View Disclosures and Other Information
From the Department of Orthopaedic Surgery, University of Michigan Medical Center, Ann Arbor
1971 by The Journal of Bone and Joint Surgery, Incorporated
J Bone Joint Surg Am, 1971 Dec 01;53(8):1551-1560
5 Recommendations (Recommend) | 3 Comments | Saved by 3 Users Save Case


The patella contributes to the knee extension moment arm through the entire range of knee motion. Its contribution increases with progressive extension. In terms of extension moment, special modifications of transverse repair have no advantage over simple transverse approximation of the patellar ligament and quadriceps tendon, but transverse repair is superior to longitudinal repair.

Depending on the technique of patellectomy defect repair, full postpatellectomy extension may require as much as a 30 per cent increase in quadriceps force. Tibial tubercleplasty can lengthen the extension moment arm and permit full extension with no greater force than that required in the knee before patellectomy. A 30 per cent increase in quadriceps force may be beyond the capacity of some patients, particularly those with long-standing intra-articular disease, those in advanced age, or those who have extension lag prior to operation. If patellectomy is indicated for this select group of patients, tibial tubercleplasty ought to be considered.

Figures in this Article
    This article is only available in the PDF format. Download the PDF to view the article, as well as its associated figures and tables.


    Sign In to Your Personal ProfileSign In To Access Full Content
    Not a Subscriber?
    Get online access for 30 days for $35
    New to JBJS?
    Sign up for a full subscription to both the print and online editions
    Register for a FREE limited account to get full access to all CME activities, to comment on public articles, or to sign up for alerts.
    Register for a FREE limited account to get full access to all CME activities
    Have a subscription to the print edition?
    Current subscribers to The Journal of Bone & Joint Surgery in either the print or quarterly DVD formats receive free online access to JBJS.org.
    Forgot your password?
    Enter your username and email address. We'll send you a reminder to the email address on record.

    Forgot your username or need assistance? Please contact customer service at subs@jbjs.org. If your access is provided
    by your institution, please contact you librarian or administrator for username and password information. Institutional
    administrators, to reset your institution's master username or password, please contact subs@jbjs.org


    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
    CME Activities Associated with This Article
    Submit a Comment
    Please read the other comments before you post yours. Contributors must reveal any conflict of interest.
    Comments are moderated and will appear on the site at the discretion of JBJS editorial staff.

    * = Required Field
    (if multiple authors, separate names by comma)
    Example: John Doe

    Related Content
    The Journal of Bone & Joint Surgery
    JBJS Case Connector
    Topic Collections
    Related Audio and Videos
    PubMed Articles
    Clinical Trials
    Readers of This Also Read...
    JBJS Jobs
    Pennsylvania - Penn State Milton S. Hershey Medical Center
    Massachusetts - The University of Massachusetts Medical School
    Oregon - The Center - Orthopedic and Neurosurgical Care and Research