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. 2002 Feb;61(2):145–150. doi: 10.1136/ard.61.2.145

Increased bone mineral content and bone size in the femoral neck of men with hip osteoarthritis

J Arokoski 1, M Arokoski 1, J Jurvelin 1, H Helminen 1, L Niemitukia 1, H Kroger 1
PMCID: PMC1753998  PMID: 11796401

Abstract

Objectives: Even though clinical findings support the idea that hip osteoarthritis (OA) is associated with increased bone mineral density (BMD), the subject remains controversial. This study was therefore initiated to investigate the relation between the severity of hip OA and femoral and calcaneal BMD.

Methods: On the basis of the American College of Rheumatology criteria on classification of OA of the hip, 27 men (aged 47–64 years) with unilateral or bilateral hip OA and 30 age matched randomly selected healthy men were studied. Plain radiographs were graded using Li's scale from 0 (no OA) to 4 (severe OA). According to the side of the highest radiographic score from the patients with clinical hip OA, 29.6% had grade 1, 29.6% grade 2, and 40.8% grade 3 OA. Bone mineral content (BMC), areal BMD (BMDareal), and bone dimensions (area and width) were measured by dual x ray absorptiometry at the proximal femur. BMDareal of the calcaneus was measured from the central area of the bone. Volumetric measurements from magnetic resonance images of the femoral neck were used to create a BMD measure that was corrected for the femoral neck volume (BMDmri).

Results: There were no differences in weight, or body mass index between the study groups. There were no significant BMDareal differences in any of the subregions of the proximal femur (femoral neck and trochanter) or calcaneus between the OA and control groups. Neither did the BMDmri of the femoral neck differ between the groups. However, the BMC of the femoral neck was 18% higher (p<0.01) in patients with OA than in controls. Similarly femoral neck bone width and volume were 9% and 18% respectively higher (p<0.001) in patients with OA.

Conclusions: The results suggest that men with hip OA have larger femoral neck size and consequently higher BMC than healthy controls matched for age and sex. There is no significant difference in femoral neck BMD (BMDareal or BMDmri) between the groups. Furthermore, increased BMDareal was not found in the peripheral skeleton. These findings suggest that hip OA is not associated with an increase in BMDareal in the femoral neck. However, the increase in BMC and bone size in patients with hip OA may play a part in the pathogenesis of the disease.

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Figure 1 .

Figure 1

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Location of the regions of interest (ROIs) in the proximal femur (A) and calcaneus (B).

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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