Hexapod Frame Correction of Proximal Tibial Recurvatum Caused Indirectly by a Femoral Aneurysmal Bone Cyst in an Adolescent: A Case Report and Systematic Review

JBJS Case Connect. 2024 Mar 7;14(1). doi: 10.2106/JBJS.CC.23.00496. eCollection 2024 Jan 1.


Case: A 16-year-old boy presented with a recurrent distal femur aneurysmal bone cyst accompanied by a combined sagittal knee deformity (20° of femoral antecurvatum and 26.8° of tibial recurvatum) and limb shortening. After preoperative planning, the treatment involved new intralesional curettage, phenolization, and bone allograft filling. Additional procedures included distal extension femoral osteotomy with plate fixation, and proximal tibial osteotomy with, gradually corrected through a hexapod frame. At 2-year follow-up, lower limbs exhibited normoalignment and equal length.

Conclusion: Complex knee deformities may occur with tumoral lesions around the knee but can be effectively addressed through double osteotomy and application of a hexapod frame.

Publication types

  • Case Reports
  • Systematic Review

MeSH terms

  • Adolescent
  • Bone Cysts, Aneurysmal* / complications
  • Bone Cysts, Aneurysmal* / diagnostic imaging
  • Bone Cysts, Aneurysmal* / surgery
  • Femur / abnormalities
  • Femur / diagnostic imaging
  • Femur / surgery
  • Humans
  • Joint Deformities, Acquired* / complications
  • Joint Deformities, Acquired* / surgery
  • Knee Joint / surgery
  • Male
  • Tibia / diagnostic imaging
  • Tibia / surgery