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The Association Between Phase Angle Decline and Functional Recovery Following Periacetabular Osteotomy: A One-Year
Daisuke Homma1,2, Norio Imai3, Dai Miyasaka4
1Division of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Niigata University, 757 Asahimachi-dori Ichiban-cho, Chuo-ku, Niigata 951-8510, Japan.
Journal of Clinical Medicine
|March 28, 2026
Summary
Curved periacetabular osteotomy (CPO) temporarily reduces muscle quality and function due to weight-bearing restrictions. While function recovers in 12 months, muscle quality remains impaired, suggesting a need for early interventions.
Area of Science:
- Orthopedic Surgery
- Rehabilitation Medicine
- Biomedical Engineering
Background:
- Curved periacetabular osteotomy (CPO) is a joint-preserving hip surgery for osteoarthritis.
- Postoperative weight-bearing restrictions can negatively impact muscle quality and functional recovery.
- Longitudinal assessment of muscle mass, quality (phase angle), and function after CPO is crucial.
Purpose of the Study:
- To investigate longitudinal changes in muscle mass, phase angle (PhA), and physical function after CPO.
- To explore the interrelationships between muscle quality and physical function post-CPO.
- To identify potential strategies for improving postoperative recovery.
Main Methods:
- Prospective longitudinal study of 35 female patients undergoing CPO.
- Measurements of lower-limb muscle mass and PhA using multifrequency bioelectrical impedance analysis.
- Assessment of physical function via Timed Up and Go (TUG), sit-to-stand force (F/w), and operated-side weight-bearing capacity.
Main Results:
- Operated-side muscle mass decreased at full weight-bearing (FWB) and partially recovered by 12 months.
- PhA significantly declined at FWB and remained lower than baseline at 12 months, with greater reduction than muscle mass.
- Functional measures recovered to baseline levels by 12 months, but PhA showed persistent impairment.
Conclusions:
- CPO leads to a transient decline in muscle quality and function during postoperative loading restrictions.
- While physical function recovers within 12 months, muscle quality remains partially impaired post-CPO.
- Early interventions targeting muscle quality preservation may enhance postoperative recovery after CPO.
