Minimal Damage to the Supinator Muscle After the Double-Incision Technique for Distal Biceps Tendon Repair.

BACKGROUND

The effect of the double-incision technique on the supinator muscle is unclear.

PURPOSE

The aim of this study was to quantify fatty atrophy of the supinator muscle and map the area of muscle damage.

STUDY DESIGN

Case series; Level of evidence, 4.

METHODS

A total of 19 male patients (median age, 43 years) who underwent distal biceps tendon repair were included in the analysis. Patients with a minimum of 12 months of follow-up were included. The following variables were analyzed: range of motion; shortened version of Disabilities of the Arm, Shoulder and Hand (QuickDASH) score; Summary Outcome Determination (SOD) score; and isokinetic peak force and endurance in supination. Quantitative analysis and mapping of fatty infiltration of the supinator muscle were based on the calculation of proton density fat fraction on magnetic resonance imaging scans of both elbows using the IDEAL (Iterative Decomposition of Echoes of Asymmetrical Length) sequence.

RESULTS

At an average follow-up of 24 months (range, 12-64 months), the median SOD score was 9.0 (95% CI, 7.8-9.4), and the mean QuickDASH score was 6.7 (95% CI, 0.0-14.1). A difference of 17% in peak torque was measured between repaired and nonrepaired elbows (repaired elbow: 9.7 N·m; nonrepaired elbow: 11.7 N·m;

CONCLUSION

The assessment of the supinator muscle showed a limited increase in fat fraction between the radius and ulna at the level of the bicipital tuberosity. No significant effect on supination strength was highlighted.

Informations de copyright

© The Author(s) 2020.

Déclaration de conflit d'intérêts

One or more of the authors has declared the following potential conflict of interest or source of funding: D.B. is a teaching consultant for Orthofix and Zimmer Biomet. F.C. is a teaching consultant for Zimmer Biomet. R.R. is a teaching consultant for Mitek, DePuy, Lima, Zimmer Biomet, Medacta, and Smith & Nephew. AOSSM checks author disclosures against the Open Payments Database (OPD). AOSSM has not conducted an independent investigation on the OPD and disclaims any liability or responsibility relating thereto.