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Related Concept Videos

Knee Joint01:23

Knee Joint

3.7K
The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
3.7K

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Chronic Knee Dislocation After Total Knee Arthroplasty.

John P Ross, Nicholas M Brown, Brett R Levine

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    |December 15, 2015
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    Summary
    This summary is machine-generated.

    Chronic dislocation after total knee arthroplasty (TKA) is rare but serious. Management requires revision surgery with enhanced constraint and potential extensor mechanism reconstruction, though long-term outcomes may be inferior.

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    Area of Science:

    • Orthopedic Surgery
    • Biomedical Engineering

    Background:

    • Chronic dislocation after total knee arthroplasty (TKA) is a rare complication, defined as occurring 4 weeks or more post-surgery.
    • This condition can be associated with extensor mechanism disruption, ligamentous instability, and capsular contracture, complicating management.
    • Few reports detail the treatment strategies for chronic TKA dislocation.

    Observation:

    • This article presents three cases of chronically dislocated TKAs, highlighting the challenges in their treatment.
    • Management often necessitates a higher degree of constraint to ensure knee stability.
    • Extensor mechanism allograft reconstruction was required in two of the three reported cases.

    Findings:

    • Revision surgery for chronic TKA dislocation requires enhanced constraint, such as a constrained condylar device or hinged knee prosthesis.
    • Reconstruction of the extensor mechanism is frequently necessary.
    • Restoration of the joint must also address concomitant bony defects.

    Implications:

    • The authors recommend a comprehensive surgical approach involving enhanced constraint, extensor mechanism repair, and management of bony defects for chronically dislocated TKAs.
    • Patients must be informed that long-term outcomes following revision for chronic TKA dislocation may be less favorable compared to revisions for other causes.
    • This study underscores the complexity and potential for suboptimal results in managing this rare but severe complication of total knee arthroplasty.