Abstract
The healing response technique (HRT) is a nonreconstructive method to promote healing
in proximal anterior cruciate ligament (ACL) tears. The study reviews clinical and
radiological long-term results. Thirty patients (average age 31 years) were treated
according to the protocol described by Steadman et al. For comparison, an age- and
gender-matched control group of conservatively treated patients (CST; n = 127) was
selected. At follow-up (mean: 4 years), all patients were evaluated using Kneelax-3-arthrometer,
magnetic resonance imaging (MRI), and by clinical examination. Two HRT patients were
lost to follow-up and 10 (36%) patients needed definitive ACL reconstruction. The
rate of secondary ACL reconstruction in the initial CST group was 56% (71 of 127).
Nineteen of the conservatively treated patients were selected according to above-mentioned
criteria. The average Lysholm score in the HRT group was 91 (CST group = 90), and
the Orthopaedische Arbeitsgemeinschaft Knie score was 93 (CST group = 92). Tegner
score decreased from 6.8 before injury to 5.7 at the time of follow-up (CST group:
6.0 to 5.1). Kneelax-3-arthrometer showed a significant higher anterior knee laxity
compared with the noninjured side in both groups. MRI showed improvement of the ACL
in both groups. HRT in adult patients is associated with a high revision rate of 36%
secondary ACL reconstruction, comparable with primary conservative treatment (p = 0.056). For the remaining patients (64%), HRT did not result in better outcomes
than conservative treatment.
Keywords
anterior cruciate ligament - knee - healing response - conservative treatment - magnetic
resonance imaging