If the patella remains unstable, revision of patellar alignment should be postponed pending the results of the rotational correction; this may be undertaken at the time of rod removal.
The characteristic property of paradoxical sentences like the Liar sentence is that they are unstable in revision sequences: there is no point in the sequence at which they reach a stable truth value.
The largest modification index suggested an effect from well-being to anxiety, which might be clinically possible, but the estimate of this effect was insignificant and statistically unstable, so no revisions were made to the Figure 1 model for one week before death.
Note that we could use revision-theoretic notions to make rather fine-grained distinctions among sentences: Some sentences are unstable in every revision sequence; others are stable in every revision sequence, though stably true in some and stably false in others; and so on.
In selected fractures adjacent to an unstable stem, implant revision is mandatory.
The peri-prosthetic fracture pattern can have implications for recovery and treatment; however, as both fractures created an unstable femoral stem, revision of the stem would be necessary if they occurred in the early post-operative period [16].
Use of the external fixator yielded a high fusion rate, with only 19% resulting in unstable pseudarthrosis requiring revision.
Revisions of unstable THAs are generally considered technically demanding procedures [20, 21, 22].
To date, no report addresses similar outcomes for the management of unstable HAHs treated by revisions with dual mobility cups.
No risk of a new revision due to instability after insertion of dual mobility cups resulted in our experience, and this option may be strongly considered in cases of revisions of unstable hemiarthroplasties.
Recently, good results have been obtained by the use of "dual mobility" cups for revisions of unstable THAs [23, 24, 25, 26, 27, 28, 29, 30, 31] and primary implants after femoral neck fractures [32], in terms of limitation of dislocation recurrence and preservation of a wide range of motion (ROM): low wear is also expected.
