Influence of consciousness, muscle action and activity on medial condyle translation after Oxford unicompartmental knee replacement

E. C. Pegg, J. Bare, H. S. Gill, H. G. Pandit, J. J. O'Connor, D. W. Murray, A. J. Price

Research output: Contribution to journalArticle

3 Citations (Scopus)
261 Downloads (Pure)

Abstract

Background
Quantification of the in vivo position of the medial condyle throughout flexion is important for knee replacement design, and understanding knee pathology. The influence of consciousness, muscle action, and activity type on condyle translation was examined in patients who had undergone medial unicompartmental knee replacement (UKR) using lateral video fluoroscopy.
Methods
The position of the centre of the femoral component relative to the tibial component was measured for 9 patients under different conditions. The following activities were assessed; passive flexion and extension when anaesthetised, passive flexion and extension when conscious, active flexion, extension and step-up.
Results
The position of the centre of the femoral component relative to the tibial component was highly patient dependent. The greatest average translation range (14.9 mm) was observed in anaesthetised patients, and the condyle was significantly more anterior near to extension. Furthermore, when conscious but being moved passively, the femoral condyle translated a greater range (8.9 mm) than when moving actively (5.2 mm). When ascending stairs, the femoral condyle was more posterior at 20-30 degrees of flexion than during flexion/extension.
Conclusions
The similarity between these results and published data suggest that knee kinematics following mobile-bearing UKR is relatively normal. The results show that in the normal knee and after UKR, knee kinematics is variable and is influenced by the patient, consciousness, muscle action, and activity type.
Original languageEnglish
Pages (from-to)646-652
Number of pages7
JournalThe Knee
Volume22
Issue number6
Early online date27 Oct 2015
DOIs
Publication statusPublished - 1 Dec 2015

Keywords

  • Knee
  • Unicompartmental
  • Kinematics
  • Fluoroscopy

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