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Published in: International Orthopaedics 2/2018

01-02-2018 | Original Paper

Function and activity after minimally invasive total hip arthroplasty compared to a healthy population

Authors: Eberhard von Rottkay, Lars Rackwitz, Maximilian Rudert, Ulrich Nöth, Johannes Christian Reichert

Published in: International Orthopaedics | Issue 2/2018

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Abstract

Purpose

The aim of the present study was to compare the daily activity and functionality in a patient cohort 12 months after total hip arthroplasty (THA) using a direct anterior approach with a healthy non-operated control population.

Methods

Sixty-four patients who underwent THA and 59 healthy individuals (control) were assessed regarding their daily activity and joint functionality utilizing the Harris hip score (HHS), the extra short musculoskeletal functional assessment questionnaire (XSFMA), the Short Form 36 (SF-36) health survey and a Stepwatch™ Activity Monitor (SAM). Post-operative x-ray images after THA were analysed regarding inclination and stem positioning.

Results

Twelve months after surgery, the average HHS showed no significant difference between both groups equalling 90.7 points in the THA patient group and 90.8 in the healthy volunteer group. The XSFMA functional index scores were 11.0 (THA) and 5.0 (control) while the bother index summed up to a score of 15.3 (THA) and 7.6 (control) respectively thus differing significantly (p < 0.001). Daily activity equalled 4227 (THA) and 4687 (control) load cycles per day (p = 0.327) while a number of 5658 (THA) and 6417 (control) steps per day (p = 0.011) was recorded.
The SF-36 physical component scores were 47.3 (THA) and 50.6 (control) points while the psychometric properties added up to a score of 56.1 (THA) and 55.9 (control). The physical component was determined to be significantly different (p < 0.001) whereas no statistically significant difference could be shown for the psychometric properties (p = 0.511).
The radiographic analysis revealed an average cup inclination of 39.9° without signs of migration. Stem positioning was neutral in 53% of all cases while 36% were graded varus and 11% valgus.

Conclusion

In summary, our short-term results show an activity, functionality and quality of life for patients one year after THA comparable to healthy control individuals.
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Metadata
Title
Function and activity after minimally invasive total hip arthroplasty compared to a healthy population
Authors
Eberhard von Rottkay
Lars Rackwitz
Maximilian Rudert
Ulrich Nöth
Johannes Christian Reichert
Publication date
01-02-2018
Publisher
Springer Berlin Heidelberg
Published in
International Orthopaedics / Issue 2/2018
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI
https://doi.org/10.1007/s00264-017-3541-z

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