Application of Bench-Mounted Saws for Precision Replacement Arthroplasty of the Arthritic Knee — The Questor Systems
Prosthetic replacement arthroplasty has revolutionised surgical treatment for arthritis of hip and knee joints, but as time passes, the number of failures, (mainly) due to loosening of the implant, increases. Although poor design and material features have a recognised importance in loosening, a malpositioned prosthesis must carry the greatest responsibility [1–4]. The precision involved in the manufacturing process of the implant is set to a level of tolerance ±0. 2 mm. This is, in all likelihood, a factor of over ten times greater precision than current bone cutting/placement techniques. The geometric accuracy employed in the construction of the implants sets a standard to be emulated in the orientation and accurate placement of the prosthesis; it recommends a comparably high level of placemealignment accuracy for the bone cuts.
KeywordsTotal Knee Arthroplasty Posterior Cruciate Ligament Anterior Superior Iliac Spine Replacement Arthroplasty Kingston General Hospital
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- 2.Hvid I, Nielsen S (1984) Total condylar knee arthroplasty. Prosthetic component positioning and radiolucent lines. Acta Orthop Scand 55:160–165Google Scholar
- 3.Kagan A II (1977) Mechanical causes of loosening in knee joint replacement. J Bio-mech 10:387–391Google Scholar
- 4.Bargren JH, Blaka JD, Freeman MAR (1986) Alignment in total knee arthroplasty — correlated biomechanical and clinical observations. Clin Orthop 173:178–183Google Scholar
- 5.Bargren JH, Freeman MAR, Swanson SAV, Todd RC (1976) ICLH (Freeman/Swan-son) arthroplasty in the treatment of arthritis knee, a two to four-year review. Clin Or-thop 120:65Google Scholar
- 6.Insall J et al. (1979) The total condylar knee prosthesis: the first 5 years. Clin Orthop 68:77Google Scholar
- 9.Hungerford DS, Krackow KA, Kenna RV (1980) The Howmedica universal total knee instrument system. Howmedica, Rutherford, NJGoogle Scholar
- 12.Greenberg RL, Kenna RV, Hungerford DS, Krackow KA (1984) Instrumentation for total knee arthroplasty. In: Hungerford DS, Krackow KA, Kenna RV (eds) Total knee arthroplasty: a comprehensive approach. Williams and Wilkins, Baltimore, pp 36–40Google Scholar
- 13.Krackow KA (1983) Approaches to planning lower extremity alignment for total knee arthroplasty and osteotomy about the knee. Adv Orthop Surg 7:69Google Scholar
- 14.Wevers HW, Espin E, Cooke TDV (1987) Orthopaedic sawblades. A case study. J Arthroplasty 2:43–46Google Scholar