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Exact(2)
Posterior stabilized total knee prostheses that are similar in design to constrained prostheses also tend to increasing axis deviations and inlay breakage after a few years, especially in patients with severe preoperative axis deviation of the leg axis of more than 10° in the coronal plane [ 4].
Furthermore, an extended examination of the patient after a constraint total knee arthroplasty with the symptoms of unknown discomfort, persistent effusion of the joint, instability or deviation of the leg axis should be performed because of a suspicion of a PE inlay failure.
Similar(58)
The final outcome measurement of precision of the achieved leg axis was equivalent to the deviation of the effective leg axis from the planned postoperative leg axis (i.e., actual "effective" postoperative leg axis−planned postoperative leg axis).
As several prospective randomized studies could show, the standard deviation of the mechanical leg axis is reduced significantly [ 4, 14, 16].
In a previous study, our study group found a correlation between increased alpha angles and deviation of the mechanical leg axis [ 26].
Due to the increasing deviation of the mechanical leg axis and breakage of the post, the post has to be regarded as the weak point of the constrained total knee joint arthroplasty, where the tibial post is not reinforced with a metal rod.
In about 85% of cases, a perfect result in terms of deviation of the planned mechanical leg axis could be achieved.
Our initial hypothesis could be proven as the study clearly shows that in this first prospective case series in about 85% (including learning curve), a perfect result in terms of deviation of the planned mechanical leg axis could be achieved using computer assistance as in intraoperative guiding tool.
The following parameters were recorded: convulsions in any part of the body; psychomotor slowness; disorientation; confusion; aphasia; pupillary reflex; unilateral sensorimotor deficit in the face, arm or leg; deviation of the head and eyes; neglect; nystagmus; and other findings.
The leg and foot angles were determined through the midline of the leg and the calcaneus.
Normal reaction vector of the leg (L_i).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com