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Muscle in hallux valgus.

P Hoffmeyer1, J N Cox, Y Blanc

  • 1Hôpital Cantonal Universitaire, Geneva, Switzerland.

Clinical Orthopaedics and Related Research
|July 1, 1988
PubMed
Summary
This summary is machine-generated.

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Muscle imbalance contributes to hallux valgus. Biopsies revealed abnormal intrinsic foot muscles with cellular changes, and gait analysis showed impaired foot function in patients.

Area of Science:

  • Orthopedics
  • Podiatry
  • Biomedical Engineering

Background:

  • Muscle imbalance is a widely recognized factor in hallux valgus development.
  • The intrinsic muscles of the foot play a crucial role in maintaining foot structure and function.

Purpose of the Study:

  • To investigate the histological and ultrastructural characteristics of intrinsic foot muscles in hallux valgus patients.
  • To correlate muscle biopsy findings with gait analysis and surface electromyography (EMG) in hallux valgus.

Main Methods:

  • Muscle biopsies were performed on 57 hallux valgus patients to examine intrinsic foot muscle histology and ultrastructure.
  • Gait analysis was conducted on 19 symptomatic hallux valgus patients and 19 asymptomatic volunteers.
  • Surface EMG was used to assess the electrical activity of intrinsic foot muscles.

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Main Results:

  • Histological abnormalities, including myogenic and neurogenic alterations, were found in 53 of 57 biopsy specimens.
  • Ultrastructural examination revealed enlarged mitochondria with paracrystalline inclusions in 31 cases.
  • Abnormal rollover patterns were observed in 70% of gait cycles in hallux valgus patients, compared to 80% normal in controls.
  • Abnormal intrinsic muscle EMG activity patterns were identified in the patient group.

Conclusions:

  • Intrinsic foot muscles in hallux valgus patients exhibit significant histological and ultrastructural abnormalities.
  • Altered muscle function, as indicated by gait and EMG analysis, is associated with hallux valgus.
  • Chronic ischemia due to elevated foot pressure during gait may contribute to these muscle changes.