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Patellar fractures after total knee replacement
Journal article   Open access   Peer reviewed

Patellar fractures after total knee replacement

Kyung Ah Chun, Kenjirou Ohashi, D Lee Bennett and Georges Y El-Khoury
American journal of roentgenology (1976), Vol.185(3), pp.655-660
09/2005
DOI: 10.2214/ajr.185.3.01850655
PMID: 16120913
url
https://doi.org/10.2214/ajr.185.3.01850655View
Published (Version of record) Open Access

Abstract

The objective of our study was to describe the patterns of patellar fracture after total knee replacement and assess their clinical significance. A retrospective review of patellar fractures after total knee replacement was performed. Seventeen cases were identified over a 10-year period. Radiographs, radiology reports, medical records, and operative notes were reviewed and analyzed. The clinical analysis included the time to fracture, the patient's symptoms and signs, whether the extensor mechanism was disrupted, and the treatment administered for the fracture. The radiographic analysis included fracture pattern, displacement, patellar position, presence of patellar osteonecrosis, and presence of soft-tissue abnormality. The incidence of patellar fractures after total knee replacement was 1.14%. The mean time from total knee replacement to patellar fracture was 17.5 months. Nine fractures were asymptomatic and identified on routine follow-up radiographs. The patterns of fracture were diverse: Transverse (n = 6), comminuted (n = 2), vertical (n = 5), and avulsion (n =4) fractures were seen. Thirteen fractures were displaced. Patellar osteonecrosis was suspected in four fractures, and three fractures were associated with disruption of the quadriceps tendons. Thirteen fractures were treated nonoperatively, and four were treated surgically. Patellar fractures are an uncommon, but important, complication after total knee replacement. Radiologists should be familiar with the imaging features of these fractures and their clinical significance.
 Humans Middle Aged Fractures, Bone - epidemiology Male Incidence Radiography Patella - diagnostic imaging Fractures, Bone - etiology Aged, 80 and over Arthroplasty, Replacement, Knee Female Aged Retrospective Studies Fractures, Bone - diagnostic imaging Postoperative Complications - diagnostic imaging

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