Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Arthroplasty - Hip
Abstract number: 22918
CLINICAL AND RADIOGRAPHIC EVALUATION OF 300 CEMENTLESS HIP
PROSTHESIS: AVERAGE SEVEN AND A HALF YEAR CLINICAL AND
RADIOGRAPHIC FOLLOW-UP OF THE “NATURAL HIP” .
Thomas PACE 1 , James KAREGEANNES 2 , Michael PALMER 1 , Rebecca SNIDER 1 ,
Stephanie TANNER 1
1 Greenville Hospital System University Medical Group, Greenville (UNITED
STATES), 2 Blue Ridge Bone and Joint, Asheville (UNITED STATES)
The Zimmer Natural Hip stem is an uncemented tapered, split tip, proximally porous
in-growth femoral stem that attempts to address shortcomings noted in earlier
uncemented femoral stem designs. This study proposes to evaluate the outcome of
hip arthroplasty with the use of the Natural Hip femoral component in patients who
had been followed for seven and a half years postoperatively. Three hundred
consecutive primary hip arthroplasties were performed by a single surgeon in 263
patients using the Natural Hip from 1993 to 2001. One hundred eighteen patients
were excluded leaving 182 cases in 156 patients were included in the final review.
There were 15 revisions, only one was deemed to be stem related. Two stems were
revised for infection. One hip was revised for polyethylene cup wear issues and
seven hips were successfully revised (cups only) for recurrent dislocations. The
infected revision cases were revised with minimal bone loss and received a primary
stem as the definitive implant. Harris Hip Scores improved from an average of 68
pre-operatively to an average of 99 at last follow up. There were six cases of
subcollar calcar erosion and 5 cases of calcar round off. Primary total hip arthroplasty
and hemiarthroplasty with the tapered, collared, split tip, proximal in-growth Titanium
uncemented femoral component is associated with a low rate of aseptic loosening,
osteolysis and thigh pain at a mean follow-up of 7.5 years.
6