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Related Concept Videos

Muscles of the Shoulder01:23

Muscles of the Shoulder

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The muscles surrounding the shoulder girdle, including the clavicle and scapula, primarily stabilize the scapula. This stable base allows other muscles to move the humerus effectively. Scapular movements often mirror those of the humerus and extend its range of motion. For instance, raising the arm above the head would not be feasible without simultaneous upward rotation of the scapula.
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Strength Assessment After Reverse Shoulder Arthroplasty.

Alexandre Almeida1, Aloir DO Junior2, Samuel Pante3

  • 1Orthopaedic Sugreon, Pompeia Hospital, Caxias do Sul, RS, Brazil.

Journal of Shoulder and Elbow Arthroplasty
|April 20, 2023
PubMed
Summary

Patients undergoing reverse shoulder arthroplasty (RSA) experience a 25% reduction in anterior flexion force (AFF) and lateral abduction force (LAF) compared to controls. No significant prognostic factors for muscle strength recovery after RSA were identified.

Keywords:
Reverse shoulder arthroplastyflexion strength and abduction strength

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Area of Science:

  • Orthopedic surgery
  • Biomechanics
  • Musculoskeletal research

Background:

  • Reverse shoulder arthroplasty (RSA) is a common procedure for complex shoulder conditions.
  • Assessing functional outcomes, particularly muscle strength, is crucial for patient recovery.
  • Limited data exists on the specific forces generated after RSA compared to healthy individuals.

Purpose of the Study:

  • To evaluate anterior flexion force (AFF) and lateral abduction force (LAF) in patients post-RSA.
  • To compare these forces with a similar-age control group.
  • To identify prognostic factors influencing muscle strength recovery after RSA.

Main Methods:

  • A cohort of 42 patients who underwent primary RSA was compared to 36 age-matched controls.
  • Anterior flexion force (AFF) and lateral abduction force (LAF) were measured using a digital isokinetic traction dynamometer.
  • Prognostic factors including surgical history, imaging, and complications were analyzed.

Main Results:

  • The arthroplasty group (AG) showed significantly lower average AFF (15 N) and LAF (14 N) compared to the control group (CG) (AFF 21 N, LAF 19 N).
  • This represents an approximate 25% reduction in muscle strength in the RSA group.
  • No statistically significant prognostic factors were identified for muscle strength recovery.

Conclusions:

  • Reverse shoulder arthroplasty leads to a significant deficit in anterior flexion and lateral abduction strength.
  • Current prognostic indicators do not reliably predict muscle strength recovery post-RSA.
  • Further research may be needed to optimize rehabilitation strategies and improve functional outcomes.