Restricted motion in flexion is a frequent TKA complication (0.1–5.3%). The aetiology has to be searched because adhesive knee arthritis is a rare pathology. Neglecting an implant malposition, an infection or a RSDS can lead to early recurrence of stiffness. After 8 weeks, it is very dangerous to try a knee manipulation under anaesthesia. Thus, we have the choose between two difficult arthrolysis: the open and the arthroscopic. We have developed the Less Invasive Arthrolysis (LIA) as a less aggressive technique to treat knee flexion stiffness. This subcutaneous procedure (performed by one or two arthroscopic portals) was already described on a short number of patients or as a part of the arthroscopic arthrolysis. In our institution, we have performed 3738 TKA, 144 knee manipulations (3.8%) and 67LIA after TKA (21% from other surgeons) between 1997 and 2009. We have reviewed retrospectively these 67 cases (Group A) and reviewed clinically 41 of these patients in a study consultation (Group B). Subjective results: from 41 patients (B), 66% have more flexion, 32% feel less pain (VAS: 6), 49% feel better than before LIA. 58% would undergo a new LIA if they had to do it again. Objective ROM (A):preoperative ROM: 88°, in the early postoperative period, we noted a 31° flexion improvement. At the last evaluation (6–120m after LIA), the flexion improvement was 17°(−15/+80) and the final ROM was 105°. The flexion falls of 45% in the first 6 months and became stable at the 7th month (until120m). We have isolated two particular subgroups: the first including the carriers of femoral implants positioned in internal rotation (< 5°) (6% of A), in which the flexion was only improved by 6°; the second including those who underwent a stiffness recurrence (9% of A) after knee manipulation, for which we obtained a stabilization of their flexion at 105° 1 year after LIA. Relative patellar mobility(B): 66% kept a free and painless patella. Mean clinical scores (B): the long term OXF-12 score (best=12) is 33 (−18%), the HSS (best=104) is 74 (+12%). Considering the delay between TKA and LIA (67 patients, mean 28m (2–120)), the best results were obtained when we performed 6 to 24m after TKA (flexion +19° in the 7–12m, +17° in the 13–24m, versus 14° in the > 25m group). No infection occurred (0/67). We never did twice the LIA in the same knee. The published series on open arthrolysis performed 17m after TKA show an improvement of flexion by 25°, 8° for extension. An arthroscopic arthrolysis performed 12m after TKA can lead to 20° of improvement in flexion (17–42) and 3° in extension. The gold operative indication is a flexion reduced to less than 90°, 6 months after TKA, with anterior knee pain. This study presents a reliable less invasive technique studied on a bigger group with a longer follow-up and approachable by the majority of surgeons.

Spondylolysis can be associated with severe back or leg pain requiring surgical management.

Fusion is the most often performed procedure since disk degeneration is frequently present. In a limited number of cases, when there is no disk disease or only limited dehydration, isthmic reconstruction may be considered, saving mobility and avoiding adjacent level stress.

We review 30 patients submitted to L4 or L5 posterior arch reconstruction and 60 patients submitted to a one level (L4L5 or L5S1) posterior or interbody fusion.

Through Prolo scores, SF36 and Oswestry questionnaires, the every day, professional and sports functional and satisfaction rates are evaluated.

Present data fail to show better functional results in the isthmic reconstruction group. However, even longer follow up will be necessary in these groups of young adults with a great life expectancy to show potentially less degenerative deterioration in adjacent levels. Meanwhile, isthmic reconstruction proved to be an effective technique, comparable to fusion in patients with no associated disk disease, with no need for further surgery and minimal complications.