Ten-year survival of the MS-30 matt-surfaced cemented stem

Author:

Berli B. J.1,Schäfer D.1,Morscher E. W.2

Affiliation:

1. Orthopaedic Department

2. University of Basel, Felix Platter-Spital, CH-4012 Basel, Switzerland.

Abstract

The Morscher-Spotorno (MS-30) femoral stem is a stainless-steel, straight, three-dimensionally tapered, collarless implant for cemented fixation in total hip replacement. We report the results at ten years of a consecutive series of 124 total hip replacements in 121 patients with the matt-surfaced MS-30 stem and an alumina ceramic head of 28-mm diameter. All the stems were fixed with Palacos bone cement with gentamicin using a modern cementing technique. They were combined with an uncemented, press-fit cup. The mean period of observation was 10.2 years (8.3 to 12.1) and no patient was lost to follow-up. Twenty-seven patients (22%) died with the implant in situ. Nine could only be interviewed by telephone. We included 85 patients with 88 hips in the clinical and radiological follow-up examinations. None of the stems or cups had been revised. The Harris hip score was excellent or good in 97% (85 hips) and moderate in 3% (three hips). Radiologically, six hips (6.8%) had osteolysis adjacent to the stem, mostly in Gruen zone 7. Twenty (22.7%) showed one or more radiolucent lines. Twenty-two stems (25%) had subsided by 2 mm to 5 mm. In these cases two showed osteolysis (9.1%) with subsidence and four without (6.1%). Radiolucent lines were seen in seven with migration (31.8%) and in 13 without (19.7%). No infections and no acetabular osteolysis were observed. The clinical results were excellent with survivorship after ten years of 100% and only a slightly statistically non-significant higher rate of osteolysis and radiolucency in cases of subsidence.

Publisher

British Editorial Society of Bone & Joint Surgery

Subject

Orthopedics and Sports Medicine,Surgery

Reference33 articles.

1. Morscher EW, Spotorno L, Mumenthaler A, Frick W. The cemented MS-30 stem. In: Morscher EW, ed. Endoprosthetics. Berlin, etc: Springer, 1995:211–19.

2. Miller J, Johnson A. Advances in cementing techniques in total hip arthroplasty. In: Stilwell WT, ed. The art of total hip arthroplasty. New York: Grunde & Stratton, 1987:277–92.

3. Ebramzadeh E, Sarmiento A, McKellop HA, Linas A, Gogan W. The cement mantle in total hip arthroplasty. J Bone Joint Surg [Am] 1994;76-A:77–87.

4. Draenert K, Draenert Y. Die adaptation des knochens an die deformation durch implantate: strain-adaptive bone remodelling. Munich: Art & Science, 1992.

5. A comparative experimental study of stresses in femoral total hip replacement components: The effects of prostheses orientation and acrylic fixation

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