title: [Minimally invasive retrograde drilling of osteochondral lesions of the femur using an arthroscopic drill guide].
abstract: OBJECTIVE
  Retrograde drilling for penetration of subchondral sclerotic bone in osteochondrosis dissecans (OCD) of the femoral condyle with preserved cartilage integrity. Hereby, revascularization of the OCD and immigration of bone marrow cells to achieve stable reintegration of the OCD into the surrounding subchondral bone.
  
  
  METHODS
  Stable juvenile and adult osteochondrosis dissecans (stage I-II of the International Cartilage Repair Society (ICRS) classification) of the medial and lateral femoral condyle with an intact articular surface and surrounding sclerosis zone, which is visible in the x-ray.
  
  
  METHODS
  OCD stage III-IV of the ICRS grading scale. Relative contraindication: preceding retrograde drilling.
  
  
  METHODS
  Arthroscopic inspection and palpation of the cartilage defect. Minimal incision over the M. vastus medialis (when the defect is located in the medial condyle) or the M. vastus lateralis (when the defect is located in the medial condyle). Preparation and dissection of the fascia of the vastus muscle. Insertion of retractors underneath the vastus muscle to expose the metaphysis of the distal femur. Intraarticular positioning of the arthroscopic drill guide, placement of the wire guide and a Kirschner(K) wire on the femur metaphysis and retrograde drilling with a 2.0-2.2 mm K wire under radiographic visualization. Length measurement of the intraosseous wire distance. Switch the guide mechanism to a multiple hole drill guide and, depending on the defect size, insertion of a further 7-10 K wires of same thickness and defined length.
  
  
  METHODS
  Sterile bandage and slightly compressive dressing. Continuous active and passive knee motion. Weight bearing of 20 kg for 6 weeks, with subsequent transition to continuous weight bearing. Radiographic controls at 6 and 12 weeks postoperatively. In case of a persistent sclerosis zone in the control x-ray or clinical abnormalities, control MRI is indicated.
  
  
  RESULTS
  A total of 55 patients with a mean age of 19.6 years were treated using the described technique: 49 patients (89.1%), and 54 knees respectively (35 juvenile OCD, 19 adult OCD), were seen with a mean follow-up of 37.9 months. An improvement was observed in 81.6% of the knees using the radiographic score, i.e., a mean improvement of 1.13 of the radiographic score published by Rodegerdts and Gleissner (preoperative 3.04 vs. postoperative 1.91). Juvenile OCD showed better radiographic results overall (88.2% healing) than adult OCD (66.7% healing).
authors: Orthopädische Klinik, König-Ludwig-Haus, Universität Würzburg, Brettreichstr., Deutschland. s-goebel.klh@mail.uni-wuerzburg.de
authors: S
authors: S
authors: Goebel
authors: A
authors: A
authors: Steinert
authors: A
authors: A
authors: Rucker
authors: M
authors: M
authors: Rudert
authors: T
authors: T
authors: Barthel
mesh_terms: D000293:Adolescent; D000328:Adult; D001182:Arthroscopy / Q000295:instrumentation*; D001864:Bone Wires; D002358:Cartilage, Articular / Q000473:pathology / Q000601:surgery; D002648:Child; D005260:Female; D005269:Femur / Q000098:blood supply / Q000473:pathology / Q000601:surgery*; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000098:blood supply / Q000473:pathology / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000295:instrumentation*; D015915:Motion Therapy, Continuous Passive; D010008:Osteochondritis Dissecans / Q000175:diagnosis / Q000601:surgery*; D010020:Osteonecrosis / Q000601:surgery*; D011182:Postoperative Care; D011183:Postoperative Complications / Q000175:diagnosis / Q000601:surgery; D012086:Reoperation; D013525:Surgical Instruments; D055815:Young Adult