Calcification of the femoral origin of the medial collateral ligament (MCL) of the knee is named as Pellegrini–Stieda lesion. Post-traumatic ossification of the whole MCL rarely occurs and results in limitation of range of motion of the knee. We present two case reports with post-traumatic ossified whole MCL with limited range of motion. Surgical excision of the bony mass was carried out after which the knee was medially unstable. MCL reconstruction was carried out using a distally based semitendinosus ligament, which was looped to reconstruct the superficial MCL and the posterior oblique ligament. It is important to reconstruct the MCL of the knee to restore the medial instability that results after excision of an ossified whole MCL.