Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Patellar dislocation following total knee replacement.

R L Merkow, M Soudry, J N Insall

    The Journal of Bone and Joint Surgery. American Volume
    |December 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    Normal isometric strength of rotatorcuff muscles in adults.

    Bone & joint research·2013
    Same author

    The role of activin A in the human osteoblast cell cycle: a preliminary experimental in vitro study.

    Experimental and clinical endocrinology & diabetes : official journal, German Society of Endocrinology [and] German Diabetes Association·2010
    Same author

    A simple technique for the placement of Schanz screws into bone using minimal radiologic control.

    Tropical doctor·2009
    Same author

    Walking ability following knee arthroplasty: a prospective pilot study of factors affecting the maximal walking distance in 18 patients before and 6 months after total knee arthroplasty.

    The Knee·2007
    Same author

    Technique for closed reduction of femoral shaft fracture using an external support device.

    Injury·2005
    Same author

    Flexion-extension gap changes during total knee arthroplasty: effect of posterior cruciate ligament and posterior osteophytes removal.

    The journal of knee surgery·2004
    Same journal

    Do Younger Patients Undergoing Transfibular Total Ankle Arthroplasty Achieve Outcomes Comparable with Those of Older Patients? Interpreting Nonsignificant Differences in Clinical Research: Commentary on an article by Kevin A. Schafer, MD, et al.: "Clinical and Radiographic Outcomes at a Mean of 7 Years Following Primary Transfibular Total Ankle Arthroplasty in Younger and Older Patients".

    The Journal of bone and joint surgery. American volume·2026
    Same journal

    Clinical and Radiographic Outcomes at a Mean of 7 Years Following Primary Transfibular Total Ankle Arthroplasty in Younger and Older Patients.

    The Journal of bone and joint surgery. American volume·2026
    Same journal

    Quantifying Protrusio Risk in the Metastatic Acetabulum: A Step Toward Precision: Commentary on an article by Will Jiang, BS, et al.: "Development of a Radiographic Scoring System to Estimate Acetabular Protrusion Risk in Patients with Osteolytic Periacetabular Metastases".

    The Journal of bone and joint surgery. American volume·2026
    Same journal

    Can We Find the Oracle of Fracture Union?: Commentary on an article by Luke A. Lopas, MD, et al.: "A Fracture Healing Odyssey: Kinematic Comparison of Unions and Nonunions in Human Lower-Extremity Long Bones Treated with Intramedullary Nailing. A Retrospective Cohort Study".

    The Journal of bone and joint surgery. American volume·2026
    Same journal

    Stacked-Cone Constructs for Extensive Tibial and/or Femoral Bone Loss in Complex Primary and Revision TKA: A Multicenter Analysis of 84 Cases.

    The Journal of bone and joint surgery. American volume·2026
    Same journal

    Shaping Modern Practice in South Korea: A Centennial Review of Orthopaedics at Severance Hospital and Yonsei University College of Medicine.

    The Journal of bone and joint surgery. American volume·2026
    See all related articles

    Symptomatic lateral patellar dislocation after total knee replacement is a disabling complication. Surgical realignment of the extensor mechanism effectively treated these dislocations, with no redislocations reported in a long-term follow-up study.

    Area of Science:

    • Orthopedic Surgery
    • Biomedical Engineering

    Background:

    • Patellar problems, including dislocation, occur in 5-30% of total knee replacement (TKR) patients.
    • Lateral patellar dislocation post-TKR can lead to significant disability.

    Purpose of the Study:

    • To evaluate the efficacy of extensor mechanism realignment for treating symptomatic lateral patellar dislocation after TKR.
    • To identify causes and contributing factors of patellar dislocation post-TKR.

    Main Methods:

    • Retrospective review of 11 patients (12 knees) treated for lateral patellar dislocation post-TKR between 1974 and 1982.
    • Surgical interventions included proximal quadriceps realignment, lateral retinacular release, or component revision with realignment.
    • Diagnosis of osteoarthritis or rheumatoid arthritis, presence of valgus deformity, and causes of dislocation were recorded.

    Related Experiment Videos

    Main Results:

    • The study included 11 female patients (average age 62 years, average weight 87 kg).
    • Causes of dislocation included trauma (3 knees), patellar maltracking (6 knees), and tibial component malrotation (3 knees).
    • Excellent (10 knees) or good (2 knees) outcomes were achieved with no redislocations after an average 34-month follow-up.

    Conclusions:

    • Extensor mechanism realignment is an effective treatment for lateral patellar dislocation following total knee replacement.
    • Implant design did not appear to be a causative factor in this patient cohort.
    • Surgical correction leads to favorable long-term outcomes and prevents recurrence.