Position of the knee joint after total joint arthroplasty |
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| Affiliation: | 1. Department of Family Medicine and Public Health, UCSD, 9500 Gilman Drive, MC 0905, La Jolla, CA 92093, United States;2. Mayo Clinic, 13400 E. Shea Blvd, MCCRB 2-205, Scottsdale, AZ 85259, United States;3. North American Quitline Consortium, 3219 E. Camelback Road, #416, Phoenix, AZ 85018, United States;4. Alere Wellbeing, Clinical and Behavioral Sciences, 999 3rd Ave Suite 2100, Seattle, WA 98104, United States;5. Moores Cancer Center, UCSD, 9500 Gilman Drive, MC 0905, La Jolla, CA 92093, United States;1. AZ Klina, Department of Orthopedic Surgery and Traumatology, Augustijnslei 100, 2930 Brasschaat, Belgium;2. KU Leuven, Department of Mechanical Engineering, Biomechanics Section, Celestijnenlaan 300C, 3001 Leuven, Belgium;1. ZESBO - Centre for Research on Musculoskeletal Systems, University of Leipzig, Semmelweisstr. 14, 04103 Leipzig, Germany;2. Department of Orthopedic, Trauma and Plastic Surgery, University of Leipzig, Leipzig, Germany;3. Institute of Anatomy, University of Leipzig, Leipzig, Germany;4. Orthopedic Department, Collm-Clinic Oschatz, Oschatz, Germany |
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| Abstract: | A method for assessing knee joint position after surgery using the preoperative long-leg radiograph and the postoperative knee radiograph is described. Assessment of the formula has shown a near perfect correlation between the calculated position on the long-leg radiograph compared with the measured position for 44 knees. Three hundred eighteen knees after total joint arthroplasty were retrospectively reviewed and the postoperative position was determined. The preoperative position of the mechanical axis was 14.5 ± 37.3 mm medial to the knee joint center. Using the standing knee radiograph the postoperative position of the mechanical axis was 3.07 ± 9.2 mm lateral to the knee joint center, while the portable radiograph placed the mechanical axis 4.5 ± 12.4 mm medial to the knee joint center. There was a highly significant difference in the position of the knee joint center depending on the radiograph used for calculation (standing or portable). The difference between the two means was not due to opening of the knee joint, but likely due to change in the rotation of the knee in the presence of knee flexion. This series of the knee arthroplasties has a low projected rate of aseptic failure. |
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