1. PFC Sigma Knee System, Primary Surgical Technique, DePuy, Leeds, UK.
2. Optetrak, operative technique, Exactech, Gainsville, FL, USA.
3. Profix Total Knee System, operative technique, Smith and Nephew, Memphis, TN, USA.
4. Nexgen surgical technique, Zimmer Inc, USA.
5. Kinemax total knee arthroplasty: trial by template;Heal;J Arthroplasty,2002