Is Thoracodorsal Nerve Transection Needed in Latissimus Dorsi Breast Reconstruction?

Latissimus dorsi (LD) breast reconstruction is of proven efficacy. Advantages of thoracodorsal nerve transection are potential prevention of muscle spasticity/movement; disadvantages are possible long-term muscle atrophy and volume loss. This study's purpose is to provide data that would support or refute nerve transection.

A retrospective study of all LD breast reconstruction patients from 2011 to 2017 was done. Total number of flaps was identified, as was thoracodorsal nerve transection. Outcomes were noted for symptomatic muscle spasticity/involuntary movement, and complications inclusive of hematoma, seroma, and capsular contracture.

A total of 125 patients had 170 flaps. Eighty-one flaps had nerve transection; 89 did not. These cohorts had no differences in comorbidities, indications of surgery (cancer vs prophylactic), irradiation, delayed/immediate reconstruction, and use of expanders. Symptomatic muscle movement/spasticity was not significantly different: 3 (3.7%) of 78 in transection and 5 (5.6%) of 84 in nontransection (P = 0.55, χ). Incidence of seroma in the transection group was notably higher (18/81; 22% vs 12%) but not statistically significant (P = 0.09, χ). No differences existed in all other outcomes.

Symptomatic spasticity or involuntary muscle movement occurs in a small number of patients with LD breast reconstruction and is not affected by thoracodorsal nerve transection. Movement after transection is likely due to aberrant nerve innervation and reinnervation. The absence of movement without transection is due to disruption of muscle position and origin after transfer. Seroma formation may be affected by increased axillary dissection required for nerve transection. These data do not support nerve transection, and therefore, it is not recommended.