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Dairaku K, Ishii M, Kobayashi S, et al. Initial evaluation on subsidence of cemented collarless polished tapered stem applied to the patients with narrow femoral medullar canal. Open Orthop J. 2010;4:147-51doi: 10.2174/1874325001004010147.
Dairaku, K., Ishii, M., Kobayashi, S., Kawaji, H., Sasaki, K., Takakubo, Y., & Takagi, M. (2010). Initial evaluation on subsidence of cemented collarless polished tapered stem applied to the patients with narrow femoral medullar canal. The open orthopaedics journal, 4147-51. https://doi.org/10.2174/1874325001004010147
Dairaku, Katsuyuki, et al. "Initial evaluation on subsidence of cemented collarless polished tapered stem applied to the patients with narrow femoral medullar canal." The open orthopaedics journal vol. 4 (2010): 147-51. doi: https://doi.org/10.2174/1874325001004010147
Dairaku K, Ishii M, Kobayashi S, Kawaji H, Sasaki K, Takakubo Y, Takagi M. Initial evaluation on subsidence of cemented collarless polished tapered stem applied to the patients with narrow femoral medullar canal. Open Orthop J. 2010 Mar 16;4:147-51. doi: 10.2174/1874325001004010147. PMID: 20448819; PMCID: PMC2864431.
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Open Orthop J. 2010 Mar 16;4:147-51. doi: 10.2174/1874325001004010147.

Initial evaluation on subsidence of cemented collarless polished tapered stem applied to the patients with narrow femoral medullar canal.

The open orthopaedics journal

Katsuyuki Dairaku, Masaji Ishii, Shinji Kobayashi, Hiroyuki Kawaji, Kan Sasaki, Yuya Takakubo, Michiaki Takagi

Affiliations

  1. Department of Orthopaedic Surgery, Yamagata University School of Medicine, 2-2-2 Iida-Nishi, Yamagata 990-9585, Japan.

PMID: 20448819 PMCID: PMC2864431 DOI: 10.2174/1874325001004010147

Abstract

PURPOSE: The geometry of the proximal femur is one of the important factors for choosing the suitable stem. We have been applied cemented collarless polished tapered (CPT) stem to the patients with small femur. Radiographic evaluation was performed to access the clinical feature of the stem in early stage of the follow-up.

METHODS: One hundred total hip arthroplasties with CPT system were performed between October 2004 to February 2006. This study focused on the 53 cases to whom size 1 or smaller sized stem were implanted, and its post-operative period was 41 months (30-46 months). Morphologic classification of preoperative proximal femur, stem alignment, thickness of the cement mantle, cementing technique, subsidence of the stem, improvement in the bone-cement interface, and stress shielding were assessed.

RESULTS: The size of the inserted stem was X-SMALL in one case, SMALL in two cases, SIZE 0 in 12 cases, and SIZE 1 in 38 cases. Canal shape of proximal femur was stovepipe type in five cases, normal type in 43 cases, and champagne-flute type in five cases. There was no subsidence in eight cases. 44 stems subsided within 1 mm, one stem subsided 1 to 2 mm, and no stem subsided over 2 mm. In 39 of 45 cases, subsidence was appeared within six months after operation. Marked progressive and excessive subsidence was not seen after the two years of follow-up.

CONCLUSIONS: Short term radiographic results of THA with CPT stem to small femur were satisfactory with less unfavorable radiographic findings, which imply contribution to longer survivorship of the stem.

Keywords: Small femur; cement mantle; migration; subsidence; total hip arthroplasty.

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