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Several factors have been advocated, such as sex, cognitive status, anatomy of the acetabulum (related to patients); femoral head diameter, femoral stem rotation and off-set, surgical approach and excessive removal of joint capsule (related to surgeons) [4, 5].
The intraoperative stem rotation angle against the sleeve was also examined [ 3, 8].
Stem rotation was evaluated by comparing the radiologic landmarks of the implant with the femur landmarks.
We found a difference of 0.24° (95% CI: –0.94 to 0.47) in stem rotation between the 2 cement types.
The primary outcome metric was stem subsidence as measured with RSA; secondary measures included stem rotation and functional scores.
Secondary stem rotation or varus or valgus tilting of more than 2° was not observed in any of the cases.
Similar(46)
Both stem designs achieved excellent outcome for fixation (stem subsidence and stem rotations close to zero) and clinical outcome, without any difference between the 2 groups (P >.12).
Stem rotations were measured as rotations of that segment around the same axes.
For example, when leaves alternate up a stem, one rotation of the spiral touches two leaves, so the pattern or ratio is 1/2.
This process was repeated over multiple crystal orientations (equivalent to STEM scan rotations) to avoid possible orientation bias.
One of these, C B, stems from rotation around the newly formed C C bond and engages in an intramolecular nucleophilic attack that results in the formation of heterocycle D. Hydrolysis during aqueous workup gives rise to products 3 a– e and 4 c– e.
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