Browsing by Person "Burnett, R."

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Knee kinematics in functional activities seven years after total knee arthroplasty
(Elsevier, 2007-03) van der Linden, Marietta; Rowe, P. J.; Myles, C.; Burnett, R.; Nutton, R. W.
Background. Detailed knowledge of knee kinematics during functional activities is lacking in current studies on the long-term outcome of total knee replacement surgery. The aim of this study was to assess functional knee kinematics using flexible electrogoniometry in patients seven years after unilateral primary total knee arthroplasty for osteoarthritis. Methods. The knee joint functional movement of a cohort of patients (n = 19) with knee osteoarthritis was assessed using electrogoniometry before surgery and 18-24 months and seven years after total knee surgery. The mean age of the patients (11 women and 8 men) at the time of the pre-surgery assessment was 67 years old (SD 8.0). Patient function was also assessed using the Knee Society Score and WOMAC osteoarthritis Index. Findings. The function components of the Knee Society and WOMAC scores were significantly decreased at seven years compared to 18-24 months after surgery (both P < 0.05). However, the majority of the functional knee flexion values derived from electrogoniometry did not decrease. Seven years after surgery, knee excursion during ascending and descending stairs was significantly improved compared to 18-24 months after surgery (both P < 0.01). Interpretation. The finding that functional knee motion continues to improve between 18-24 months and seven years post-surgery is of interest to both patients and those responsible for their treatment planning. Further, it was shown that the WOMAC and Knee Society Scores do not follow the same trends as the patients' functional knee kinematics seven years after total knee replacement surgery.
The influence of obesity on patient reported outcomes following total knee replacement
(Hindawi Publishing Corporation, 2012-10-17) Ayyar, V.; Burnett, R.; Coutts, Fiona; van der Linden, Marietta; Mercer, Tom
This study retrospectively analysed the effects of obesity as described by Body Mass Index (BMI) on patient reported outcomes following total knee replacement. Participants (105 females and 66 males) who had undergone surgery under the care of a single surgeon were included in the review and were grouped according to their pre operative BMI into non obese (BMI<30 kg/m²), (n= 73) obese (BMI ≥30 kg/m²) (n=98). Oxford knee score (OKS) and Short Form 12 scores (SF12) were taken pre operatively and 6 and 12 months after surgery to analyse differences between groups in the absolute scores as well as changes from pre to post surgery. Pre operatively, the obese group had a significantly poorer OKS compared to non obese (44.7 vs. 41.2, p=0.003). There were no statistically significant group effect on follow-up or change scores of the OKS and SF12. Correlations coefficients between BMI and follow-up and change scores were low (r<0.201). There were no significant differences in the number of complications and revisions (local wound infection, 6.7% non obese, 11% obese, post operative systemic complication 8% non obese 12% obese, revision 4 % non-obese, 3% obese). In conclusion, our findings indicate similar degrees of benefits from the surgery irrespective of patient BMI.