title: Relationship between Mucoid Degeneration of the Anterior Cruciate Ligament and Posterior Tibial Slope in Patients with Total Knee Arthroplasty.
abstract: OBJECTIVE
  The purpose was to analyze the relationship between posterior tibial slope (PTS) and mucoid degeneration of the anterior cruciate ligament (ACL) in patients with total knee arthroplasty.
  
  
  METHODS
  Four hundred and twenty-four patients (24 males and 400 females; 636 knees) who received total knee arthroplasty for osteoarthritis were included. Their mean age was 68.9 years (range, 48 to 88 years). The patients were classified into three groups according to the status of ACL; normal ACL group (group I), mucoid degeneration of ACL group (group II) and ruptured or absent ACL group (group III). Plain lateral radiographs were used to measure the PTS and the values were compared among groups.
  
  
  RESULTS
  There were no significant differences with regard to gender, age and left-to-right side ratio among groups (p>0.05). The mean PTS was 9.9° (range, 0.6° to 20.1°) in group I (161 knees), 10.8° (range, 0.2° to 21.8°) in group II (342 knees) and 12.3° (range, 2° to 22.2°) in group III (133 knees), which showed significant differences (p<0.001).
  
  
  CONCLUSIONS
  The patients with mucoid degeneration of the ACL and those with ruptured or absent ACL had greater PTS than those with normal ACL. These findings suggest that an increased PTS may be one of the causative factors for mucoid degeneration of the ACL.
authors.affiliation: Department of Orthopedic Surgery, Ulsan University Hospital, Ulsan, Korea.
authors.forename: Yoon-Seok
authors.initials: YS
authors.lastname: Youm
authors.affiliation: Department of Orthopedic Surgery, Ulsan University Hospital, Ulsan, Korea.
authors.forename: Sung-Do
authors.initials: SD
authors.lastname: Cho
authors.affiliation: Department of Orthopedic Surgery, Ulsan University Hospital, Ulsan, Korea.
authors.forename: Hye-Yong
authors.initials: HY
authors.lastname: Cho
authors.affiliation: Department of Orthopedic Surgery, Ulsan University Hospital, Ulsan, Korea.
authors.forename: Seung-Hyun
authors.initials: SH
authors.lastname: Jung
keywords: Anterior cruciate ligament; Arthroplasty; Knee; Mucoid degeneration; Posterior tibial slope