CAN SHOE SIZE CORRECTLY PREDICT THE SIZE OF COMPONENTS OF TOTAL KNEE REPLACEMENT PRE-OPERATIVELY

Abstract

Objective: To ascertain the correlation between shoe size and sizes of femoral and tibial components of total knee replacement preoperatively in patients undergoing total knee arthroplasty. Study design: Prospective cohort study Study settings and duration: This study was conducted at department of orthopedic surgery, Shifa International Hospital, Islamabad from July 2020 – December 2020. Material and methods: Sample size was calculated using WHO calculator and it was 43 patients in total. Patients were approached through non-probability consecutive sampling. Shoe size of patients was measured using a Brannock device. During surgery, Implant model and sizes of the femoral and tibial components implanted during knee replacement were noted. Data was analyzed with the help of SPSS version 24. We applied Pearson’s correlation cofficeint. P value ≤ 0.05 was considered significant. Results: Out of 43, there were 9(20.9%) male and female 34(79.1%). Mean age of patients was 51.7±6.8 (SD). We found good positive correlation between shoe size and tibial component (p=<0.001). Positive co relation was found between femoral component and shoe size (p=0.001). Shoe size predict 72% of Tibial component and 65% femoral component. Conclusion: Shoe size is effective and safe predictors of total knee replacement components pre-operatively. This procedure is more accurate and less labor intensive. Accurate templating result in less surgical duration and provide several benefits to patients and health care providers.