J Korean Orthop Assoc.  2009 Apr;44(2):266-270.

Posterior Instability after Posterior Cruciate Ligament Substituted TKA: Case Report

• Park JH
• Choi SJ
• Lee HS
• Park HT

Abstract

Posterior instability after a posterior ligament substituted total knee replacement is considered impossible due to the cam and post mechanism. Therefore, it has not been considered easily as a problem necessitating revision surgery. We report two cases of posterior instability after a fixed bearing posterior cruciate ligament substituted total knee replacement with a review of relevant literature.

Keyword

Posterior cruciate ligament substituted total knee replacement; Posterior instability

MeSH Terms

Arthroplasty, Replacement, Knee
Ligaments
Posterior Cruciate Ligament
Ursidae

Figure

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  Fig. 1 Knee lateral radiograph after slip down injury shows slight anterior displacement of tibial polyethylene insert. The arrow indicates for radiolucent tibial polyethylene that has been anterior displaced.

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  Fig. 2 Knee posterior-drawer stress radiograph after injury shows marked posterior displacement of tibia more than 12 mm compared to contralateral side.

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  Fig. 3 Intra-operative photograph during revision surgery shows anterior dislodge of tibial polyethylene insert.

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  Fig. 4 Knee lateral radiograph at a year follow-up after reinsertion surgery shows well-maintained tibial polyethylene insert.

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  Fig. 5 Knee lateral radiograph of a 69-year-old woman who has been done TKR since 5 years ago shows nonspecific abnormality.

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  Fig. 6 Knee posterior-drawer stress radiograph after injury shows marked posterior displacement of tibia more than 10 mm compared to contralateral side.

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  Fig. 7 Intra-operative photograph during revision surgery shows post breakage of tibial polyethylene insert.

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  Fig. 8 Removed polyethylene prosthesis. The post of tibial polyethylene insert was broken at base and showed deformity at anterior aspect of post.

Reference

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