What other elbow injuries can occur during this phase?

MCL sprain and hyperextension valgus overload syndrome can occur in this phase.  MCL sprains occur with continual valgus stress and can sometimes result in injury to radiocapitella joint.  Hyperextension valgus overload syndrome is an overuse injury from repetitive valgus loads.  This syndrome can cause posterior elbow impingement and lead to posterior osteophyte formation.