The isolated arthroscopic lateral release has been already presented in the literature as an effective alternative for surgical treatment of different degrees of patellofemoral instability. This paper is to evaluate the long term results of this procedure in patients with recurrent dislocation of the patella (RDP).

Material of this study is a group of patients who underwent isolated arthroscopic lateral release for RDP with a minimum 10 years follow-up. All the patients included presented 1) clear clinical history of RDP 2) positive apprehension test 3) patella able to be dislocated under anesthesia. Were excluded from this study patients who presented 1) generalised ligamentous laxity 2) habitual dislocations of the patella 3) avulsion fracture of the patella 4) marked malalignment 5) age over 40 years. 42 patients met these criteria and 27 (28 knees) were available for follow-up. There were 13 females and 14 males with an average age of 20, 1 years and an average follow-up of 13, 4 years.

All the patients were evaluated for patellar stability and functional outcomes with both Miller and Bartlett and Crosby and Insall scores. According to the evaluation scores above mentioned 16 knees (57%) were rated as excellent /good results.

The isolated lateral release can be considered as the first approach for the treatment of RDP. The outcomes are adversely affected by long term-follow-up, however, it does not compromise any further treatment.

We measured the initial fixation strength of a new graft, bone-hamstring-bone (BHB), for reconstruction of the anterior cruciate ligament (ACL) in 79 porcine knees and compared it with that of the normal porcine ACL and of the bone-patellar tendon-bone (BPB) graft. All specimens were subjected to ultimate load to failure and cyclic loading tests to assess the amount of graft slippage. The ultimate load to failure for the intact ACL was 1266 +/- 250 N, for the BPB graft 663 +/- 192 N and for the BHB graft 354 +/- 92 N (p < 0.01). After cycling to 235 N (the maximum load for all groups without failure) the average residual displacements after removal of the load for the ACL, BPB and BHB grafts were 0.031 +/- 0.013 cm, 0.078 +/- 0.033 cm, and 0.322 +/- 0.222 cm, respectively (p < 0.01). For the BHB graft the load to failure was less and the amount of graft slippage was more than for the BPB graft. Neither form of reconstruction was as strong as the intact ACL.