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J Orthop. 2015 Jun 10;12(4):228-36. doi: 10.1016/j.jor.2015.05.008. eCollection 2015 Dec.

Comparison between component designs with different femoral head size in metal-on-metal total hip arthroplasty; multicenter randomized prospective study.

Author information

1
Department of Orthopaedic Surgery, Kansai Rosai Hospital, Amagasaki, Hyogo, 660-8511, Japan.
2
Department of Orthopaedic Surgery, Showa University, Fujigaoka Hospital, Yokohama, Kanagawa, 227-8501, Japan.
3
Funabashi Orthopaedic Hospital, Funabashi, Chiba, 274-0822, Japan.
4
Department of Orthopaedic Surgery, Kansai Medical University Takii Hospital, Moriguchi, Osaka, 570-8507, Japan.
5
Department of Orthopaedic Surgery, Yokohama City University, Yokohama, Kanagawa, 236-0004, Japan.
6
Department of Orthopaedic Surgery, Aihara Hospital, Mino, Osaka, 562-0004, Japan.

Abstract

BACKGROUNDS/AIMS:

We prospectively studied 78 prostheses with conventional femoral head and 86 prostheses with large head (Magnum) of metal-on-metal total hip arthroplasty (MoM THA) with two years follow-up.

METHODS:

Clinical outcomes and blood metal ion were evaluated.

RESULTS:

There were no significant differences of clinical outcomes between groups. 1.17 ± 1.01 μg/L of blood cobalt ion in Magnum was significantly lower than 1.99 ± 2.34 μg/L in conventional group. No dislocation was observed in Magnum while one dislocation in conventional group. MoM THA with large head is useful if the implants are positioned in appropriate alignment, however longer follow-up will be necessary.

CLINICAL TRIAL REGISTRATION:

NCT01010763 (registered on ClinicalTrials.gov).

KEYWORDS:

Large head; Metal ion; Metal on metal total hip arthroplasty

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