title: Osteomyelitis of the patella: ensure a high index of suspicion and beware the negative aspirate.
abstract: We report the case of a 33-year-old man who presented several times to healthcare professionals over a 6-week period with a painful swollen right knee. He had a history of chronic osteomyelitis of the left femur and had recently stopped taking suppressive antibiotics. A joint aspirate did not demonstrate any organisms. On subsequent review by the orthopaedic team MRI was performed which revealed an isolated area of osteomyelitis and an abscess in his right patella. He underwent arthrotomy, debridement and irrigation of the joint alongside antibiotic treatment. We highlight this case, as isolated osteomyelitis of the patella is a rare condition, especially in adults. In addition, the presenting features of osteomyelitis of the patella are varied and joint fluid aspirates often do not reveal an organism. This case therefore aims to raise an awareness of this condition and thereby ensure a high index of suspicion when symptoms or signs are present and inform clinicians of the investigative steps in order to avoid a delay in diagnosis as seen in this case.
authors.affiliation: North Tees and Hartlepool NHS Foundation Trust, Stockton on Tees, UK.
authors.forename: Andrew James
authors.initials: AJ
authors.lastname: Berg
authors.affiliation: North Tees and Hartlepool NHS Foundation Trust, Stockton on Tees, UK.
authors.forename: Maire-Clare
authors.initials: MC
authors.lastname: Killen
authors.affiliation: North Tees and Hartlepool NHS Foundation Trust, Stockton on Tees, UK.
authors.forename: Amit
authors.initials: A
authors.lastname: Chauhan
authors.affiliation: North Tees and Hartlepool NHS Foundation Trust, Stockton on Tees, UK.
authors.forename: Chandra
authors.initials: C
authors.lastname: Bhatia
mesh_terms: D000038:Abscess / Q000175:diagnosis / Q000188:drug therapy / Q000601:surgery; D000328:Adult; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D002908:Chronic Disease; D003646:Debridement; D006801:Humans; D008297:Male; D010019:Osteomyelitis / Q000175:diagnosis* / Q000188:drug therapy / Q000601:surgery; D010329:Patella; D007507:Therapeutic Irrigation
chemical_list: D000900:Anti-Bacterial Agents