![]() In literature, however, this is discussed controversially. The theoretical advantage of neutral mechanical alignment-with the mechanical axis passing mid-line-is the even load distribution in the medial and lateral femorotibial compartment with consecutively reduced risk for implant loosening and wear. ![]() Conclusionīoth conventional and patient-specific instrumentation revealed adequate results with respect to restoring tibial obliquity in kinematically aligned TKA, with conventional instrumentation achieving superior results.įor decades, surgeons tried to achieve neutral tibial alignment with a medial proximal tibial angle (MPTA) of 90° and, therefore, were not trained to align the tibia according to this physiological MTPA equivalent to a mean of 2.9° with a range from 20.5° of valgus to 20.5° of varus. Consequently, CI resulted in a significantly smaller change in tibial obliquity from preoperative to postoperative than PSI ( p 0.90). In the remaining 40.0% ( n = 20), no deviation from preoperative measurements was found. Sixty percent ( n = 30) had a deviation of 0°–1°. In 50 patients with PSI, no single case with a deviation greater than 1° was found. In the remaining 78.0% ( n = 117), tibial obliquity was restored. In 150 patients with CI, no case with tibial obliquity-deviation greater than 2° was found, whilst 21.3% ( n = 32) and 0.7% ( n = 1) of cases and had a deviation of 0°–1°, and 1°–2°, respectively. Inter- and intraclass correlations were calculated and postoperative tibial obliquity compared to preoperative anatomy. Pre- and postoperative X-rays were measured twice by two observers with a 2-week break in-between. Further 100 patients received CI without randomisation, resulting in 200 patients in total (127 women, mean age: 70.7 (range: 48–90 years). One-hundred patients were randomized to receive CI ( n = 50) or PSI ( n = 50) for TKA. This study aimed at analysing the accuracy of conventional instrumentation (CI) versus patient-specific instrumentation (PSI) to restore anatomic tibial obliquity measured by the medial proximal tibial angle (MPTA) on conventional X-rays. ![]() In total knee arthroplasty (TKA), tibial obliquity-restoration using kinematic alignment (KA) poses a major difference to conventional mechanical alignment. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |