DOS 2017

DOS Kongressen 2017 ·

Cemented hemiarthroplasty for femoral neck fracture

patients: Collarless, polished tapered stem (CPT) ver-

sus anatomic matte stem (Lubinus SP2)

Rajzan Joanroy, Jesper Stork-Hansen, Lars Rotwitt, Bjarke Viberg

Department of Orthopaedic Surgery and Traumatology, Kolding Hospital – part

of Hospital Lillebaelt;. 2. Institute for Regional Health Research, 1. Kolding Hos-

pital – part of Hospital Lillebaelt. 2. University of Southern Denmark

Background:

Cemented hemiarthroplasty is a well- documented treatment for

patients presenting with femoral neck fractures (FNFs). However, there are not

many cohort studies comparing different types of hemiarthroplasty (HA).

Purpose / Aim of Study:

To compare CPT and Lubinus SP2 HA for FNF pa-

tients concerning complications and radiological measurements.

Materials and Methods:

From January 1st 2013, CPT was primarily used as

the new cemented HA due to a regional procurement. The Lubinus SP2 was the

used HA prior to CPT. Data from 3 years prior and after introduction of CPT

was retrieved from the hospital database using the NOMESCO procedure code

KNFB12. All patient health records were retrospectively reviewed for types of

implant, American Society of Anaesthesiologists (ASA) score, duration of ad-

mission, mortality, and major complications within 1 year. All x-ray images were

analyzed for radiological measurements concerning offset, stem angulation and

cement filling.

Findings / Results:

There were 300 patients with CPT and 287 with Lubinus

SP2. The mean age (SD) was 82.0 (8.2) years and 74.7% were female. There

were 7.3% major complications for CPT and 7.6% for Lubinus SP2 resulting in no

difference between the groups (p<0.527). There was no baseline difference in

age, sex, ASA score, and mortality, but the admission length was 0.7 day shorter

for the CPT group (p<0.004). The Lubinus SP2 had a mean plus 2.7 mm offset

postoperatively compared to preoperatively (p<0.001) while CPT had plus 10.6

mm (p<0.000). The mean (SD) angle of the stems where 6.4 (1.7) degrees

for Lubinus SP2 and 2.5 (1.9) for CPT (p<0.000). There was no difference in

cementation (p<0.316).

Conclusions:

There was no difference between the CPT and Lubinus SP2 stem

regarding major complications. However, the CPT stem had overcorrection of

offset and a higher degree of varus positioning.

No conflicts of interest reported

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