IMPORTANCE OF JOINT LINE RESTORATION IN TOTAL KNEE ARTHROPLASTY

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Knee Biomechanics

Background:

• Accurate restoration of the knee joint line is essential for optimal functional results following Total Knee Arthroplasty (TKA).
• Deviations from the normal joint line can significantly disrupt knee joint biomechanics, leading to adverse clinical effects.
• Understanding the impact of joint line positioning is critical for improving TKA surgical techniques and patient outcomes.

Purpose of the Study:

• To highlight the importance of restoring the knee joint line in Total Knee Arthroplasty.
• To outline the biomechanical consequences of joint line elevation and depression.
• To emphasize the need for further research to establish acceptable joint line variation ranges and standardized surgical practices.

Main Methods:

• Review of existing literature on joint line restoration in TKA.
• Analysis of biomechanical principles related to knee joint alignment.
• Identification of clinical sequelae associated with joint line malpositioning.

Main Results:

• Joint line elevation is associated with anterior knee pain, reduced range of motion, patella baja, mid-flexion instability, and patellar tendon impingement.
• Joint line depression can result in patella alta, patellar subluxation, and mid-flexion instability.
• Current literature lacks a clearly defined acceptable range for joint line variation after TKA.

Conclusions:

• Precise restoration of the knee joint line is paramount for achieving normal knee biomechanics and good functional outcomes post-TKA.
• Significant variations in joint line position can lead to predictable complications, impacting patient recovery and satisfaction.
• Further research is necessary to establish evidence-based guidelines for acceptable joint line variation and to standardize surgical techniques among arthroplasty surgeons.