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Polished tapered hip stem had no differences in major complications vs anatomic matte stem

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BARCELONA, Spain — Although use of a collarless, polished tapered stem to treat femoral neck fractures had no differences in major complications when compared with an anatomic matte stem, results presented at the EFORT Annual Congress showed a greater rate of periprosthetic fractures with the collarless, polished tapered stem.

Rajzan Joanroy

“We see that there is no difference between the [collarless, polished tapered stem] CPT and the Lubinus II-stem regarding major complications,” Rajzan Joanroy, MD, said in his presentation here. “However, it seems that the CPT stem is being set in an overcorrection of both offset and a higher degree of varus position.”

Joanroy and colleagues retrospectively reviewed 584 patient health records for types of implant, American Society of Anesthesiologists score and duration of admission. Researchers collected mortality and major complications — defined as deep infections, revisions and periprosthetic fractures — within 1 year from both patient health records and the Danish National Patient Registry. Radiological measurements concerning offset, stem angulation and cement filling were also analyzed.

In his presentation, Joanroy noted a major complication rate of 8% in the CPT group compared with a rate of 8.8% in the anatomic matte-stem group (Lubinus SP II HA, Link Orthopaedics).

“However, this was not significantly different; but it is worth noting that the distribution of complications was different for the groups,” Joanroy said.

Results showed the CPT group had a greater rate of periprosthetic fractures vs. the anatomic matte-stem group. Joanroy noted the CPT group had a mean offset of 10.6 mm and the anatomic matte-stem group had a mean offset of 2.7 mm, which was significant.

“Looking at our angulation, we see that the CPT tends to be set in 2.5 mean plus degree angle compared to the 1.4 of the Lubinus, which is also a significant result,” Joanroy said. “Looking at our instrumentation, we see no significant differences.” – by Casey Tingle

Reference:

Joanroy R, et al. Paper 956. Presented at: EFORT Annual Congress; May 30-June 1, 2018; Barcelona, Spain.

Disclosure: Joanroy reports no relevant financial disclosures.