Search JRPMS

JRPMS Vol 5, No 3, September 2021, p.93-100

doi: 10.22540/JRPMS-05-093


Οriginal Article

Patient-reported outcome measures after total knee arthroplasty using knee injury and osteoarthritis outcome score

Shota Higashihira1, Riki Inasaka1, Yuichi Iwamura1, Motonori Kohno1, Gosuke Akiyama1, Yutaka Inaba2

  1. Department of Orthopaedic Surgery, Yokohama Ekisaikai Hospital, Yokohama, Japan
  2. Department of Orthopaedic Surgery, Yokohama City University, Yokohama, Japan

Keywords: Knee injury and Osteoarthritis Outcome Score, Knee osteoarthritis, Patient reported outcome, Total joint replacement, Total knee arthroplasty


Objectives: The purpose of this study was to evaluate outcomes after TKA using Knee injury and Osteoarthritis Outcome Score (KOOS). Methods: We retrospectively reviewed 60 knees. KOOS was conducted before surgery, 3 weeks, 3 months, 6 months, and 1 year after surgery. Each score was evaluated and compared using a multiple comparison test. Besides, we evaluated the correlation between KOOS and the patient’s objective factors. Results: Regarding the total score, the value was improved at any point of post-operation (p<0.001). Especially, pain score and quality of life score were improved between 6 months and 1 year after surgery (pain score: p=0.04, quality of life score: p=0.007). The correlation between patient’s factors and KOOS, concerning age, showed that there was a positive correlation with preoperative symptom/stiffness score (p=0.004) and the pain score (p=0.04). Also, the preoperative knee extension range was correlated with symptom/stiffness score and sports/recreation score at 3 weeks after surgery (p=0.03), and quality of life score at 6 months (p=0.04). The preoperative knee flexion range showed a significant correlation with the sports/recreation score at 1 year after surgery (p=0.006). Conclusions: In conclusion, it is necessary to follow the progress of 1 year or more even for cases with a seemingly poor outcome at 6 months after surgery.