Palacos compared to Palamed bone cement in total hip replacement: a randomized controlled trial

Cemented total hip prostheses depend on cement type for stability and longevity. Bone cements differ in viscosity, but few clinical studies have compared low- and high-viscosity options. Prior research has shown that cement viscosity influences implant fixation. However, long-term clinical data comparing specific cements remain sparse. This gap motivated a need for randomized trials to evaluate migration behavior. No prior work had resolved whether low-viscosity cement compromises implant stability. The study aimed to address this uncertainty by comparing two cement types. The goal was to determine if new low-viscosity cement performs similarly to conventional high-viscosity cement.

The aim was to compare the migration behavior of a hip stem cemented with low-viscosity Palamed versus high-viscosity Palacos cement. The study focused on whether cement viscosity affects implant stability over time. Surgeons often prefer high-viscosity cement for better control during implantation. However, low-viscosity cement may offer easier handling and better penetration into bone. This uncertainty drove the need for a controlled trial. The researchers proposed that migration patterns would be similar between the two cements. The study also sought to evaluate if aseptic loosening risk remains comparable. The Stanmore stem was chosen as a consistent implant for comparison.

A randomized controlled trial was conducted with 39 patients undergoing primary total hip replacement. Patients were assigned to either Palacos or Palamed cement groups. RSA measurements were used to assess stem migration. The study followed patients for up to 10 years post-surgery. No revisions occurred in the 40 hips studied. Migration was measured in terms of translations, rotations, and MTPM. Statistical analysis compared outcomes between the two groups. No significant differences were observed in migration behavior.

At 10 years, no hips required revision in either group. RSA showed no statistically significant differences in migration. Mean translations and rotations were similar between Palamed and Palacos. Maximum total-point motion (MTPM) values also showed no significant variation. The researchers propose that both cements provide equivalent implant stability. No clinically significant differences were observed in migration patterns. The study found that low-viscosity cement did not compromise fixation. The results suggest that surgeons can choose cement based on personal preference.

The authors state that migration of the Stanmore stem was similar in both cement groups. They propose that aseptic loosening risk is comparable between Palamed and Palacos. The study does not suggest that one cement is superior to the other. Surgeons may continue using their preferred cement type. No new clinical guidelines are proposed based on these findings. The results do not imply that cement viscosity affects long-term implant survival. The authors emphasize that implant choice remains surgeon-dependent. No further research is suggested unless new clinical questions arise.