DOS 2016

DOS Kongressen 2016 ·

165

Functional outcome comparing a dual mobility cup

to a standard cup in total joint arthroplasty of the

trapeziometacarpal joint

Lone Kirkeby, Lene Dremstrup, Torben Bæk Hansen

University Clinic of Hand, Hip and Knee Surgery, Regional Hospital Holstebro,

Aarhus University

Background:

Dual mobility cup design in total joint arthroplasty may result in

increased mobility and fewer dislocations. In 2013 a dual mobility cup design

was introduced to be used with the Elektra stem for total joint arthroplasty of

the trapeziometacarpal (TM) joint.

Purpose / Aim of Study:

To determine the functional outcome after TM total

joint arthroplasty comparing the use of a dual mobility cup to the use of a stand-

ard (single mobility) cup.

Materials and Methods:

The patients were prospectively included. All pa-

tients had Eaton grade 2 or 3 osteoarthritis in the TM joint. Patients operated

June 2010 to October 2014 using the Elektra bimetal cementless screw cup

(standard cup) were compared to patients operated June 2013 to September

2014 using the Moovis Elektra dual mobility press-fit cementless cup. In bilat-

eral cases only the first operated hand was included. The Disability of the Hand,

Shoulder and Arm (DASH) score, pain using a continuous 100-mm visual analog

scale (VAS), grip strength, Karpandji score and extension of thumb were regis-

tered preoperatively and at 3 and 12 months after surgery.

Findings / Results:

58 patients (12 males/46 females), mean age 56 years

(SD 7.0), in the Elektra bimetal group and 46 patients (6 males/40 females),

mean age 58 years (SD 6.4), in the Moovis dual mobility group completed the

study. Improvement in VAS at activity from preoperative to 12 months was

significantly better in the Elektra bimetal group (P=0,024). We found no signifi-

cant difference in the improvement regarding DASH, VAS at rest, grip strength,

Karpandji score or extension of the thumb in the two groups. No dislocations

were recorded in the observation period.

Conclusions:

Dual mobility cup in total TM joint arthroplasty does not result

in better mobility or functional outcome than a standard cup. No difference in

dislocation rate was recorded.

No conflicts of interest reported

116.