title: Ultrasound-guided platelet-rich plasma injections for the treatment of common peroneal nerve palsy associated with multiple ligament injuries of the knee.
abstract: OBJECTIVE
  Peroneal nerve palsy in traumatic knee dislocations associated with multiple ligament injuries is common. Several surgical approaches are described for this lesion with less-than-optimal outcomes. The present case represents the application of plasma rich in growth factors (PRGF) technology for the treatment of peroneal nerve palsy with drop foot. This technology has already been proven its therapeutic potential for various musculoskeletal disorders. Based on these results, we hypothesized that PRGF could stimulate the healing process of traumatic peroneal nerve palsy with drop foot.
  
  
  METHODS
  The patient was a healthy 28-year-old man. He suffered peroneal nerve palsy with drop foot after multiple ligament injuries of the knee. PRGF was prepared according to the manufactured instruction. Eleven months after the trauma with severe axonotmesis, serial intraneural infiltrations of PRGF were started using ultrasound guidance. The therapeutic effect was assessed by electromyography (EMG), echogenicity of the peroneal nerve under ultrasound (US) and manual muscle testing.
  
  
  RESULTS
  Twenty-one months after the first injection, not complete but partial useful recovery is obtained. He is satisfied with walking and running without orthosis. Sensitivity demonstrates almost full recovery in the peroneal nerve distribution area. EMG controls show complete reinnervation for the peroneus longus and a better reinnervation for the tibialis anterior muscle, compared with previous examinations.
  
  
  CONCLUSIONS
  Plasma rich in growth factors (PRGF) infiltrations could enhance healing process of peroneal nerve palsy with drop foot. This case report demonstrates the therapeutic potential of this technology for traumatic peripheral nerve palsy and the usefulness of US-guided PRGF.
  
  
  METHODS
  V.
authors.affiliation: Arthroscopic Surgery Unit, UCA "Mikel Sánchez", USP-La Esperanza Clinic, La Esperanza 3, 01002, Vitoria-Gasteiz, Spain, mikel.sanchez@usphospitales.com.
authors.forename: M
authors.initials: M
authors.lastname: Sánchez
authors.forename: T
authors.initials: T
authors.lastname: Yoshioka
authors.forename: M
authors.initials: M
authors.lastname: Ortega
authors.forename: D
authors.initials: D
authors.lastname: Delgado
authors.forename: E
authors.initials: E
authors.lastname: Anitua
mesh_terms: D000328:Adult; D004576:Electromyography; D006801:Humans; D007267:Injections; D031221:Knee Dislocation / Q000150:complications / Q000601:surgery; D008022:Ligaments / Q000293:injuries*; D008297:Male; D010543:Peroneal Nerve / Q000293:injuries*; D020427:Peroneal Neuropathies / Q000175:diagnosis / Q000209:etiology / Q000628:therapy*; D053657:Platelet-Rich Plasma; D014945:Wound Healing