Jumbo cup in hip joint renovation may cause the center of rotation to increase

ARTICLE HIGHLIGHTS

Research background

Utilizing the large jumbo cup in revision total hip arthroplasty (THA) is an effective approach to cure many lacunar and segmental peripheral bone defects. However, with the use of the jumbo cup, the center of the hip joint may become elevated relative to the primary acetabulum, and the diameter of the large cup is greater.

Research motivation

In order to explore the height and significance of X-rays used to study the height of the hip joint center, as a guide for clinical work.

Research objectives

X-rays were applied to study the height and the significance of the elevation of the hip joint center.

Research methods

Eighty-eight patients were included in the study. The center height of the hip joint was measured relative to the opposite normal hip joint. The diameter of the jumbo cup was measured and checked according to operation notes, and the diameter of the jumbo cup was measured with a prosthesis label.

Research results

Radiometric analysis showed that the average hip joint center was elevated by 7.6 mm. The rotational center height delta of the renovated hip was 7.6 ± 5.6 mm, and there was an obvious difference between the two groups. For the difference in horizontal distance, there was no obvious difference between the two groups. The rotational center height delta of the renovated hip was 7.5 ± 6.2 mm, and there was a significant difference between the two groups.

Research conclusions

The application of the jumbo cup elevates the rotational center of the hip joint, but it is feasible and effective to use the jumbo cup.

Research perspectives

Applying a jumbo cup in revision THA increases the height of the rotational center of the hip joint, but it is feasible and effective to utilize jumbo cups in revision THA with a limited height.