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From the W.B. Carrell Memorial Clinic, Dallas, Texas, and Baylor University Medical Center, Dallas, Texas
* Address correspondence to Daniel E. Cooper, MD, W.B. Carrell Memorial Clinic, 2909 Lemmon Ave., Dallas, TX 75204.
Purpose: Reconstruction of the posterior cruciate ligament (PCL) using the tibial inlay fixation has been reported as an alternative to the transtibial tunnel technique. Previous failures in PCL reconstruction and early reports raising potential biomechanical and clinical advantages have spurred interest in this technique. The purpose of this study was to evaluate the minimum 2-year results of PCL reconstruction using a single-bundle bone-patellar tendon-bone graft and tibial inlay fixation.
Methods: The authors prospectively studied 44 patients having isolated or combined PCL reconstruction using the direct tibial inlay fixation technique. The study period was from 1991 to 2001. Two-year minimum follow-up was 93% (41/44) and averaged 39.4 months. These 41 patients comprised the study group. Thirty-one patients were male and 10 patients were female; average age was 28 years. There were 35 primary and 6 revision reconstructions. Surgery was performed in the acute or subacute setting (<8 weeks) in 34% (14/41) and chronic setting in 66% (27/41). Combined reconstructions involving the posterolateral corner, anterior cruciate ligament (ACL), or medial collateral ligament (MCL) were done in 85% (35/41). In all patients, preoperative posterior drawer (PD) examination demonstrated greater than 12 mm posterior translation. All PCL reconstructions were performed with bone-patellar tendon-bone graft, which was 12 to 18 mm in width (16 autograft; 25 allograft). Wider tendon grafts were prepared from the allografts and tubularized to fit through an 11-mm tunnel. All patients were evaluated with preoperative and postoperative examination and x-rays. Final follow-up International Knee Documentation Committee (IKDC) subjective evaluation, final follow-up IKDC objective evaluation, and final follow-up Telos stress radiography were performed in all patients.
Results: Postoperative PD examination demonstrated the following: 0 (normal) in 9 patients, 1+ in 25 patients, 2+ in 7 patients, and none >2+, as compared to preoperative PD 3+ or greater in all patients in this report. No patient had <12 mm PD preoperatively. Mean improvement in PD was >2 grades of translation as compared to preoperative exam. Forty of forty-one demonstrated a solid endpoint on clinical PD testing. Final follow-up Telos stress radiography with 25 kg posterior load applied at 80° to 90° of flexion demonstrated average side-to-side difference of 4.11 mm (-2 to 10 mm). Average flexion loss was 4° (0–15°). None lost extension. Preoperative IKDC objective evaluation rated all knees as severely abnormal based on instability. Final follow-up objective IKDC evaluation distribution was as follows: A, 4 knees; B, 24 knees; C, 11 knees; and D, 2 knees, as compared to all 41 D preoperatively. Average final follow-up IKDC subjective score was 75.1 (20–100). When assessing final follow-up stability with Telos stress radiography, primary cases were significantly more stable than revision cases (P < .05). There was no difference in stability when comparing allograft versus autograft, but improved IKDC scores were seen with allograft (P < .05). There was a trend for combined reconstructions to be more stable than isolated reconstructions. All patients evaluated their knee as improved or greatly improved and would repeat the procedure.
Conclusions: Reconstruction of the PCL-deficient knee with severe posterior laxity is a challenging surgical problem, as combined instability patterns frequently coexist (85% in this study). When appropriate combined reconstructions or primary repair is used, PCL reconstruction with autologous or allograft bone-patellar tendon-bone graft using tibial inlay fixation was shown to be a successful technique at 2- to 10-year follow-up. Based on their initial experience with this technique and previous experience with open and arthroscopic techniques using a transtibial tunnel, the authors continue to use the tibial inlay technique as their preferred technique for isolated or combined reconstruction of the PCL.
Key Words: PCL • posterior cruciate ligament • knee ligament • inlay technique
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