# Supratrochlear Rim Resection: Autologous Matrix-Induced Chondrogenesis–Based Arthroscopic Technique for Patients With Isolated Patellar Chondromalacia

## TL;DR

This paper introduces a new arthroscopic technique to treat patellar chondromalacia by removing a supratrochlear rim and using a cartilage reconstruction method.

## Contribution

The novel contribution is an arthroscopic technique combining supratrochlear rim resection with autologous matrix-induced chondrogenesis for patellar chondromalacia.

## Key findings

- Supratrochlear rim resection addresses both symptoms and biomechanical causes of patellar chondromalacia.
- The technique uses autologous matrix-induced chondrogenesis for cartilage reconstruction on both femoral and patellar surfaces.
- This method is proposed for patients with patella alta and isolated patellar chondromalacia without subluxation history.

## Abstract

Isolated patellar chondromalacia in patients with patella alta and no history of patellar subluxations or dislocations is associated with a supratrochlear rim at the entrance to the femoral trochlea. This technical note outlines an arthroscopic technique called supratrochlear rim resection, which proposes a line of treatment that addresses not only symptoms (patellar cartilage defect) but also a suspected biomechanical reason (supratrochlear rim). The proposed technique combines resection of the supratrochlear rim with a modification of autologous matrix-induced chondrogenesis cartilage reconstruction on the femoral side at the location of the resected rim, as well as on the patellar defect.