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Combined reconstruction of chronic posterior cruciate ligament and posterolateral corner deficiency

A TWO- TO NINE-YEAR FOLLOW-UP STUDY

¹ Royal Free Hospital and The Wellington Knee Unit, Wellington Place, St John’s Wood, London NW8 9LE, UK.
² Department of Trauma & Orthopaedics, Watford General Hospital, Watford, Hertfordshire WD18 0HB, UK.
³ Department of Orthopaedics, Royal Free Hospital, Pond Street, London NW3 2QG, UK.

Correspondence should be sent to Mr V. Khanduja at 109a, Queen’s Avenue, Watford, Hertfordshire WD18 7NU, UK; e-mail: vikaskhanduja{at}aol.com

We report a retrospective analysis of the results of combined arthroscopically-assisted posterior cruciate ligament reconstruction and open reconstruction of the posterolateral corner in 19 patients with chronic (three or more months) symptomatic instability and pain in the knee.

All the operations were performed between 1996 and 2003 and all the patients were assessed pre- and post-operatively by physical examination and by applying three different ligament rating scores. All also had weight-bearing radiographs, MR scans and an examination under anaesthesia and arthroscopy pre-operatively. The posterior cruciate ligament reconstruction was performed using an arthroscopically-assisted single anterolateral bundle technique and the posterolateral corner structures were reconstructed using an open Larson type of tenodesis.

The mean follow up was 66.8 months (24 to 110). Pre-operatively, all the patients had a grade III posterior sag according to Clancy and demonstrated more than 20° of external rotation compared with the opposite normal knee on the Dial test. Post-operatively, seven patients (37%) had no residual posterior sag, 11 (58%) had a grade I posterior sag and one (5%) had a grade II posterior sag. In five patients (26%) there was persistent minimal posterolateral laxity. The Lysholm score improved from a mean of 41.2 (28 to 53) to 76.5 (57 to 100) (p = 0.0001) and the Tegner score from a mean of 2.6 (1 to 4) to 6.4 (4 to 9) (p = 0.0001).

We conclude that while a combined reconstruction of chronic posterior cruciate ligament and posterolateral corner instability improves the function of the knee, it does not restore complete stability.

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