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Related Experiment Videos

Patellar dislocation after total knee arthroplasty

S T Wang1, H C Hsu, J J Wu

  • 1Department of Orthopedics and Traumatology, Veterans General Hospital-Taipei, Taiwan, R.O.C.

Zhonghua Yi Xue Za Zhi = Chinese Medical Journal; Free China Ed
|May 1, 1996
PubMed
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Patellar dislocation after total knee arthroplasty is a rare but disabling complication. Surgical technique errors, such as malaligned components or quadriceps imbalance, are the primary cause, necessitating specific revision strategies.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Patellar problems are a significant cause of nonseptic failure in total knee arthroplasties.
  • Patellar dislocation post-total knee arthroplasty (TKA) is infrequent but leads to disabling symptoms.

Purpose of the Study:

  • To investigate the incidence, causes, and surgical management of patellar dislocation following TKA.
  • To evaluate the outcomes of different surgical interventions for post-TKA patellar dislocation.

Main Methods:

  • A retrospective review of 1652 TKAs performed between March 1984 and July 1992.
  • Analysis of 11 cases of patellar dislocation identified during follow-up.
  • Surgical treatments included proximal realignment, lateral retinacular release with component revision, combined proximal/distal realignment, and patellar tendon transfer.

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Main Results:

  • Eleven cases of patellar dislocation were identified among 1100 TKAs with regular follow-up.
  • One redislocation occurred due to trauma after an average follow-up of 21.8 months.
  • Overall results, assessed by the Hospital for Special Surgery knee rating scale, were satisfactory (90.5).

Conclusions:

  • Surgical technique errors, including malaligned components and quadriceps imbalance, are the main causes of patellar dislocation after TKA.
  • Revision of malaligned components and proximal realignment for quadriceps imbalance are recommended.
  • Distal realignment should be cautiously considered only after proximal realignment failure due to potential complications.