title: Prevention of pseudo-patella baja during total knee arthroplasty.
abstract: OBJECTIVE
  Pseudo-patella baja (PPB) is a surgical complication that can arise from total knee arthroplasty and occurs when the patella tendon is not shortened but the level of the femorotibial joint line is elevated. The goal of this study was to assess the performance of a technique specifically designed to prevent the occurrence of PPB and its radiological results.
  
  
  METHODS
  Ninety-nine patients undergoing total knee arthroplasty were included. Patients were divided into a non-correction group and a correction group. The correction group were applied an additional metal block in order to reduce the excess resection of the distal femur. To evaluate PPB, the change in the pre- and postoperative joint line was measured using the modified Blackburne-Peel Index (BPI).
  
  
  RESULTS
  In the non-correction group, 68 of 74 cases showed an occurrence of PPB (92 %), in the correction group, 6 of 57 cases showed an occurrence of PPB (11 %). The preoperative-modified BPI of the non-correction group was not significantly different from that of the correction group (0.6 ± 0.1 vs. 0.6 ± 0.2). The modified BPI decreased significantly in the non-correction group after TKA (0.6 ± 0.1 vs. 0.2 ± 0.1, p < 0.05). However, the modified BPI did not change significantly in the correction group after TKA (0.6 ± 0.2 vs. 0.6 ± 0.2).
  
  
  CONCLUSIONS
  The comparison of preoperative and postoperative radiological results showed that our intervention maintained the joint line without elevation. We proposed an effective method to prevent various complications due to the joint line elevation that occur in PPB.
  
  
  METHODS
  III.
authors.affiliation: Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Korea.
authors.forename: Jai-Gon
authors.initials: JG
authors.lastname: Seo
authors.affiliation: Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Korea.
authors.forename: Young-Wan
authors.initials: YW
authors.lastname: Moon
authors.affiliation: Department of Orthopaedic Surgery, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea.
authors.forename: Sang-Min
authors.initials: SM
authors.lastname: Kim
authors.affiliation: Department of Orthopaedic Surgery, National Health Insurance Service Ilsan Hospital, Ilsan, Korea.
authors.forename: Sang-Hoon
authors.initials: SH
authors.lastname: Park
authors.affiliation: Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Korea.
authors.forename: Byung-Hoon
authors.initials: BH
authors.lastname: Lee
authors.affiliation: Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Korea.
authors.forename: Moon-Jong
authors.initials: MJ
authors.lastname: Chang
authors.affiliation: Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Korea. jbc2001@hanmail.net.
authors.forename: Byung-Chul
authors.initials: BC
authors.lastname: Jo
mesh_terms: D000368:Aged; D000818:Animals; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects* / Q000379:methods; D005260:Female; D005269:Femur / Q000601:surgery; D006801:Humans; D007719:Knee Joint / Q000473:pathology* / Q000601:surgery; D008297:Male; D010329:Patella / Q000601:surgery; D017847:Patellar Ligament / Q000473:pathology* / Q000601:surgery; D011184:Postoperative Period
keywords: Complication; Patella; Total knee arthroplasty