title: Is There an Inherent Risk to Damage the Popliteus Tendon by Femoral Component With Inbuilt External Rotation? A Pilot Study in Indian Knees.
abstract: BACKGROUND
  Femoral components with inbuilt rotation require thicker flexion resection of the lateral femoral condyle and could have a potential risk of damaging the popliteus tendon, especially in the smaller Asian knees.
  
  
  METHODS
  We prospectively evaluated 10 patients with bilateral varus osteoarthritis knee to size the cuts and their location in relation to the popliteus tendon. Two different types of implant were used on either side; one side requires resection in 3° external rotation (group A) and the other side requires a femoral component with inbuilt external rotation (group B). We observed the incidence of injury to the popliteus tendon and distance between flexion cut to its attachment over the lateral femoral condyle between both groups.
  
  
  RESULTS
  We had popliteus tendon injury in 3 knees all from group B. Risk of damaging the popliteus tendon was found higher in group B, as the distance between flexion cut to popliteus tendon attachment was significantly low.
  
  
  CONCLUSIONS
  Femoral component with inbuilt external rotation has more risk of injuring the popliteus tendon because flexion cut takes out more bone from the lateral femoral condyle.
authors.affiliation: Department of orthopaedics, PGIMER, Chandigarh, India.
authors.forename: Dervendra Kumar
authors.initials: DK
authors.lastname: Chouhan
authors.affiliation: Department of orthopaedics, PGIMER, Chandigarh, India.
authors.forename: Mandeep S
authors.initials: MS
authors.lastname: Dhillon
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects*; D005260:Female; D005269:Femur / Q000601:surgery; D006801:Humans; D007194:India; D007717:Knee / Q000601:surgery; D007719:Knee Joint / Q000601:surgery; D007720:Knee Prosthesis / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D011446:Prospective Studies; D011474:Prosthesis Design / Q000009:adverse effects*; D016059:Range of Motion, Articular; D012399:Rotation; D013708:Tendon Injuries / Q000209:etiology*; D013710:Tendons / Q000601:surgery
keywords: femoral cut; knee arthroplasty; popliteus tendon injury; small size Asian knee; tendon injury