Improvment in Isometric hip strength impairments in patients
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Awareness of hip muscle strength after periacetabular osteotomy is lacking in hip dysplasia patients. In patients with hip dysplasia before and 1 year after periacetabular osteotomy, researchers investigated isometric hip muscle strength and compared it with healthy volunteers. In addition, they examined whether improvements in self-reported pain and athletic function were correlated with changes in isometric hip muscle strength before and after surgery.

Isometric hip muscle strength was assessed twice in 82 patients (11 men) with a mean age of 30 (SD 9) years, before and 1 year after surgery, and once in 50 healthy volunteers. Isometric hip muscle strength was assessed with a hand-held dynamometer. Copenhagen Hip and Groin Outcome Score was used to measure self-reported outcome.

Results:
--Despite 1-year improvements in isometric hip flexion (0.1 Nm/kg; 95% CI 0.06–0.2) and abduction (0.1 Nm/kg; CI 0.02–0.2), the patient's muscle strength was 13–34% lower than the strength of the healthy volunteers both pre- and post-surgery.

--Moreover, changes in self-reported pain were associated with changes in hip flexion (13 points per Nm/kg; CI 1–26) and abduction (14 points per Nm/kg; CI 3–25), while changes in self-reported sporting function were associated with changes in hip extension (9 points per Nm/kg; CI 1–18).

In conclusion, Isometric hip muscle strength is impaired in symptomatic dysplastic hips measured before periacetabular osteotomy. 1 year after surgery, isometric hip flexion and abduction strength had improved but muscle strength did not reach that of healthy volunteers.

Source: https://www.tandfonline.com/doi/full/10.1080/17453674.2020.1864911?af=R
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