Hip strength impairments in patients with hip dysplasia before and 1 year after periacetabular osteotomy

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Introduction: Hip dysplasia is a pathological development of the hip joint with reduced acetabular weight-bearing area. The clinical presentation of hip dysplasia is groin pain, low patient-reported function and impaired hip muscle strength. Patient-reported pain and function improve after periacetabular osteotomy (PAO). However, little is known about hip muscle strength after PAO. We aimed to investigate changes in isometric hip muscle strength from before to 1 year after PAO in patients with hip dysplasia and to compare the muscle strength values of the patients to the values of a reference group with no hip problems. Material and methods: Muscle strength was assessed before and after PAO in 100 patients with a mean age of 30 years (SD 9); while the muscle strength of 50 references with a mean age of 31 (SD 9) was assessed at one time point. Isometric hip muscle strength was assessed in flexion, extension, abduction and adduction with a hand-held dynamometer using a standardised procedure. Changes in muscle strength from before to 1 year after PAO and differences between patients and references were analysed with a univariate repeated measurement model. Results: From before to 1 year after PAO, patients improved their isometric hip muscle strength in flexion and abduction, 0.13 Nm/kg (CI 0.06 - 0.20) and 0.10 Nm/kg (CI 0.02 - 0.18). Hip muscle strength in adduction did not change and muscle strength in hip extension failed to reach statistical significance (0.09 Nm/kg (CI -0.05 - 0.23), p=0.188). However, despite improvements in hip flexion and abduction, the hip muscle strength values of the patients were 13-34% lower than the hip muscle strength values of the healthy references at both time points (p<0.01). Conclusion: One year after PAO, patients improved their maximal isometric hip muscle strength in flexion and abduction. However, patients’ pre- and postoperative hip muscle strength values were low compared to the hip muscle strength values of the healthy references. Consequently, future studies should focus on the measured strength deficits and investigate if strength training can improve hip muscle strength in patients with hip dysplasia.
Periode24 okt. 2019
BegivenhedstitelDansk Ortopædkirurgisk Selskabs Kongres
BegivenhedstypeKonference
Grad af anerkendelseNational

Emneord

  • Sygdom, sundhedsvidenskab og sygepleje
  • hip dysplasia